Document:

EXHIBIT 4.1

               Hauppauge Digital Inc. Employee Stock Purchase Plan

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                             HAUPPAUGE DIGITAL, INC.
                          EMPLOYEE STOCK PURCHASE PLAN

                                    ARTICLE I
                                  INTRODUCTION

1.01   Purpose.  The  Hauppauge  Digital Inc.  Employee  Stock  Purchase Plan is
       intended to provide a method  whereby  Employees of the Company will have
       an opportunity to acquire a proprietary  interest in the Company  through
       the purchase of shares of the Common Stock of the Company.

1.02   Rules of  Interpretation.  It is the intention of the Company to have the
       Plan qualify as an "employee  stock  purchase  plan" under Section 423 of
       the Code.  The  provisions of the Plan shall be construed so as to extend
       and limit  participation in a manner  consistent with the requirements of
       that section of the Code.

                                   ARTICLE II
                                   DEFINITIONS

2.01   "Board" shall mean the board of directors of the Company.

2.02   "Company"  shall  mean  Hauppauge   Digital,   Inc.  and  its  Subsidiary
       Corporations.

2.03   "Common  Stock"  shall mean the $.01 par value  common stock of Hauppauge
       Digital, Inc.

2.04   "Code" means the Internal  Revenue Code of 1986,  as amended from time to
       time.

2.05   "Compensation" shall mean the gross cash compensation  (including,  wage,
       salary,  commission  and  overtime  earnings)  paid by the  Company  to a
       participant in accordance with the terms of employment, but excluding all
       bonus payments,  expense allowances and compensation paid in a form other
       than cash.

2.06   "Committee" shall mean the individuals described in Article XI.

2.07   "Employee"  shall mean any person  employed by the Company on a full-time
       or part-time basis,  who is regularly  scheduled to work more than twenty
       (20) hours per week and whose customary  employment is for more than five
       (5) months in any calendar year.

2.08   "Plan" shall mean the Hauppauge  Digital,  Inc.  Employee  Stock Purchase
       Plan, as set forth herein and as hereinafter amended from time to time.

2.09   "Offerings" shall mean offerings as defined in Section 4.02.

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       (a)    "Offering  Commencement  Date"  shall  mean as  defined in Section
              4.02.

       (b)    "Offering Termination Date" shall mean as defined in Section 4.02.

2.10   "Option Price" shall mean the option price as defined in Section 6.02.

2.11   "Plan  Representative" shall mean any person designated from time to time
       by the  Committee  to receive  certain  notices  and take  certain  other
       administrative actions relating to participation in the plan.

2.11   "Subsidiary  Corporation"  shall mean any  present or future  corporation
       which (i) is or becomes a "subsidiary  corporation" of Hauppauge Digital,
       Inc.  as the term is defined  in  Section  424(b) of the Code and (ii) is
       designated as a participant in the Plan by the Committee.

                                   ARTICLE III
                          ELIGIBILITY AND PARTICIPATION

3.01   Initial  Eligibility.  Each  Employee  who shall have  completed  six (6)
       consecutive  months of employment  with the Company and shall be employed
       by the  Company  on the date his  participation  in the Plan is to become
       effective  shall be eligible to participate  in Offerings  under the Plan
       which commence after such six-month period has concluded. Persons who are
       not Employees shall not be eligible to participate in the Plan.

3.02   Leave of Absence.  For purposes of participation in the Plan, a person on
       leave of absence  shall be deemed to be an Employee  for the first ninety
       (90) days of such leave of absence and such Employee's  employment  shall
       be deemed to have  terminated at the close of business on the 90th day of
       such leave of absence unless such Employee shall have returned to regular
       full-time or part-time employment (as the case may be) prior to the close
       of  business  on  such  90th  day.  Termination  by  the  Company  of any
       Employee's  leave of  absence,  other than  termination  of such leave of
       absence on return to full time or part time  employment,  shall terminate
       an Employee's employment for all purposes of the Plan and shall terminate
       such employee's  participation  in the Plan and the right to exercise any
       option.

3.03   Restrictions on Participation.  Notwithstanding any provision of the Plan
       to the  contrary,  no  Employee  shall be granted  an option to  purchase
       shares of Common Stock under the Plan:

       (a)    if,  immediately  after the grant,  such Employee  would own stock
              and/or hold outstanding options to purchase stock possessing 5% or
              more of the total combined voting power or value of all classes of
              stock of the Company (for purposes of this paragraph, the rules of
              Section  424(d)  of the  Code  shall  apply in  determining  stock
              ownership of any Employee); or

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       (b)    which permits such  Employee's  rights to purchase stock under all
              employee  stock  purchase plans of the Company to accrue at a rate
              which   exceeds   $25,000  in  fair  market  value  of  the  stock
              (determined  at the time such option is granted) for each calendar
              year in which such option is outstanding at any time.

3.04   Commencement  of  Participation.   An  eligible  Employee  may  become  a
       participant by completing an authorization for payroll  deductions on the
       form provided by the Company and filing the completed  form with the Plan
       Representative  on  or  before  the  filing  date  set  therefor  by  the
       Committee,  which date shall be prior to the Offering  Commencement  Date
       for the next  following  Offering.  Payroll  deductions for a participant
       shall commence on the next following Offering Commencement Date after the
       Employee's  authorization  for payroll  deductions  becomes effective and
       shall continue until termination of the Plan or the participant's earlier
       termination of  participation  in the Plan. Each  participant in the Plan
       shall be deemed to continue  participation  until termination of the Plan
       or such  participant's  earlier  termination of the  participation in the
       Plan pursuant to Article VIII below.

                                   ARTICLE IV
                     STOCK SUBJECT TO THE PLAN AND OFFERINGS

4.01   Stock Subject to the Plan.  Subject to the provisions of Section 12.04 of
       the Plan,  the  Company's's  Board shall  reserve  initially for issuance
       under the Plan an aggregate of One Hundred  Thousand  (100,000) shares of
       Common  Stock which  shares shall be  authorized  but unissued  shares of
       Common Stock.

4.02   Offerings.  Except as described  below with respect to the first year the
       Plan is in effect,  the Plan will be implemented by four annual offerings
       of the Company's  Common Stock each calendar year until December 31, 2003
       to be divided as  provided  below.  There  will be two (2)  Offerings  in
       calendar 2000, the first of which will begin on August 1, 2000 and end on
       September  30, 2000 and the second shall  commence on October 1, 2000 and
       end on December  31, 2000.  Thereafter,  in each year that the Plan is in
       effect,  the first  Offering will begin on January 1 and end on March 31,
       the second  Offering  will begin on April 1 and end on June 30, the third
       Offering  will  begin on July 1 and end on  September  30, and the fourth
       Offering will begin on October 1 and end on December 31. The first day of
       each Offering  shall be deemed the "Offering  Commencement  Date" and the
       last day the  "Offering  Termination  Date"  for such  Offering.  In each
       Offering, the maximum number of shares that may be issued shall be 10,000
       plus unissued shares from all prior Offerings whether offered or not.

4.03   Maximum Number of Shares. If the total number of shares for which options
       are exercised on any Offering Termination Date exceeds the maximum number
       of shares for the applicable Offering,  the Company shall make a pro rata
       allocation  of the shares  available for delivery and  distribution  in a
       nearly uniform manner as shall be practicable  and as it shall  determine
       to be equitable, and the balance of payroll

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       deductions  credited  to the account of each  participant  under the Plan
       shall be returned to such participant as promptly as possible.

                                    ARTICLE V
                               PAYROLL DEDUCTIONS

5.01   Amount of  Deduction.  The form  described  in Section 3.04 will permit a
       participant to elect payroll  deductions of any whole percentage from one
       percent (1%) through ten percent (10%) of such participant's Compensation
       for each pay period during an Offering.

5.02   Participant's  Account.  All payroll  deductions  made for a  participant
       shall be credited to an account  established for such  participant  under
       the Plan. A participant  may not make any separate cash payment into such
       account,  except  when on leave of absence  and then only as  provided in
       Section 5.04.

5.03   Changes  in   Payroll   Deductions.   A   participant   may   discontinue
       participation  in the Plan as provided in Article VIII. A participant may
       reduce or increase future payroll deductions (within the limits described
       in Section 5.01) by filing with the Plan  Representative  a form provided
       by the Company for such purpose.  The  effective  date of any increase or
       reduction in future payroll  deductions will be the first day of the next
       pay period succeeding processing of the change form.

5.04   Leave of  Absence.  If a  participant  goes on a leave of  absence,  such
       participant shall have the right to elect: (a) to withdraw the balance in
       his  or  her  account  pursuant  to  Section  7.02,  (b)  to  discontinue
       contributions to the Plan but remain a participant in the Plan, or remain
       a  participant  in the Plan  during  such leave of  absence,  authorizing
       deductions  to be made from  payments by the  Company to the  participant
       during such leave of absence and undertaking to make cash payments to the
       Plan at the end of each payroll period to the extent that amounts payable
       by the  Company  to  such  participant  are  insufficient  to  meet  such
       participant's authorized Plan deductions.

                                   ARTICLE VI
                               GRANTING OF OPTION

6.01   Number of Option Shares. On the Commencement Date of each Offering,  each
       participating  Employee shall be deemed to have been granted an option to
       purchase  a maximum  number of shares of Common  Stock  equal to (i) that
       percentage of the Employee's  Compensation which the Employee has elected
       to have  withheld  (but not in any case in excess of 10%)  multiplied  by
       (ii) the  Employee's  Compensation  during the  Offering  then divided by
       (iii) the applicable  Option Price determined as provided in Section 6.02
       below.

6.02   Option Price. The option price of stock purchased with payroll deductions
       made during any Offering for a participant therein shall be the lower of:

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       a.     85% of the closing price of the stock on the Offering Commencement
              Date for such Offering or the nearest prior  business day on which
              trading occurred on the NASDAQ National Market System; or

       b.     85% of the closing price on the Offering Termination Date for such
              Offering  or the  nearest  prior  business  day on  which  trading
              occurred on the NASDAQ National Market System.

              If the Common  Stock of the Company is not  admitted to trading on
              any of the aforesaid  dates for which closing  prices of the stock
              are to be  determined,  the  reference  shall  be made to the fair
              market value of the stock on each such date, as determined on such
              basis as shall be  established or specified for the purpose by the
              Committee.

                                   ARTICLE VII
                               EXERCISE OF OPTION

7.01   Automatic  Exercise.  Each Plan participant's  option for the purchase of
       stock with payroll  deductions made during an Offering shall be deemed to
       have been exercised  automatically on the applicable Offering Termination
       Date for the  purchase of the number of full shares of Common Stock which
       the accumulated  payroll  deductions in the participant's  account at the
       time will purchase at the  applicable  Option Price (but not in excess of
       the number of shares for which  outstanding  options have been granted to
       the participant pursuant to Section 6.01).

7.02   Withdrawal of Account.  No  participant  in the Plan shall be entitled to
       withdraw any amount from the accumulated payroll deductions in his or her
       account;  provided,  however,  that a participant's  accumulated  payroll
       deductions  shall be refunded to the  participant's  as and to the extent
       specified in Section 8.01 below upon  termination  of such  participant's
       participation in the Plan.

7.03   Fractional  Shares.  Fractional shares of Common Stock will not be issued
       under the Plan. Any accumulated  payroll deductions which would have been
       used to purchase  fractional shares,  unless refunded pursuant to Section
       7.02 above,  will be held for the  purchase  of Common  Stock in the next
       following Offering, without interest.

7.04   Exercise of Options.  During a  participant's  lifetime,  options held by
       such participant shall be exercisable only by that participant.

7.05   Delivery  of  Stock.  As  promptly  as  practicable  after  the  Offering
       Termination  Date of each  Offering,  the  Company  will  deliver to each
       participant of such Offering, as appropriate,  the shares of Common Stock
       purchased therein upon exercise of such participant's option.

7.06   Stock  Transfer  Restrictions.  The  Plan  is  intended  to  satisfy  the
       requirements of

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       Section 423 of the Code.  A  participant  will not obtain the benefits of
       this  provision  if such  participant  disposes of shares of Common Stock
       acquired  pursuant  to the Plan  within two (2) years  from the  Offering
       Commencement  Date or within one (1) year from the date such Common Stock
       is purchased by the participant, whichever is later.

                                  ARTICLE VIII
                                   WITHDRAWAL

8.01   In General.  A participant may stop participating in the Plan at any time
       by giving written notice to the Plan  Representative.  Upon processing of
       any such written notice, no further payroll  deductions will be made from
       the participant's Compensation during such Offering or thereafter, unless
       and until such participant elects to resume  participation in the Plan by
       providing written notice to the Plan  Representative  pursuant to Section
       3.04 above. Such participant's  payroll  deductions  accumulated prior to
       processing of such notice shall be applied toward  purchasing full shares
       of Common Stock in the then-current  Offering as provided in Section 7.01
       above.  Any cash balance  remaining  after the purchase of shares in such
       Offering shall be refunded promptly to such participant.

8.02   Effect on Subsequent  Participation.  A participant's withdrawal from any
       Offering will not have any effect upon such participant's  eligibility to
       participate in any  succeeding  Offering or in any similar plan which may
       hereafter  be adopted by the  Company and for which such  participant  is
       otherwise eligible.

8.03   Termination of Employment. Upon termination of a participant's employment
       with the Company  for any  reason,  including  retirement  or death,  the
       participant's  payroll deductions  accumulated prior to such termination,
       if any, shall be applied toward purchasing full shares of Common Stock in
       the  then-current  Offering,  and any cash  balance  remaining  after the
       purchase of shares in such Offering  shall be refunded to him or her, or,
       in the  case of his or her  death,  to the  person  or  persons  entitled
       thereto under Section  12.01,  and his or her  participation  in the Plan
       shall be deemed to be terminated.

8.04   Leave of Absence. A participant on leave of absence shall, subject to the
       election made by such participant  pursuant to Section 5.04,  continue to
       be a participant in the Plan so long as such participant is on continuous
       leave of absence. A participant who has been on leave of absence for more
       than  ninety  (90)  days and who  therefore  is not an  Employee  for the
       purpose of the Plan shall not be entitled to  participate in any offering
       commencing  after the 90th day of such leave of absence.  Notwithstanding
       any  other  provisions  of the  Plan,  unless a  participant  on leave of
       absence  returns to regular  full time or part time  employment  with the
       Company at the earlier of: (a) the  termination  of such leave of absence
       or (b) three  months  from the 90th day of such  leave of  absence,  such
       participant's  participation  in the Plan shall terminate on whichever of
       such dates first occurs.

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                                   ARTICLE IX
                                    INTEREST

9.01   Payment of  Interest.  No  interest  will be paid or allowed on any money
       paid into the Plan or credited to the  account of or  distributed  to any
       participant Employee.

                                    ARTICLE X
                                      STOCK

10.01  Participant's  Interest in Option  Stock.  No  participant  will have any
       interest  in shares of Common  Stock  covered by any option  held by such
       participant  until such option has been  exercised as provided in Section
       7.01 above.

10.02  Restrictions  on  Exercise.   Shares  of  Common  Stock  purchased  by  a
       participant  under  the  Plan  will  be  registered  in the  name  of the
       participant,  or, if the  participant so directs by written notice to the
       Plan  Representative  prior to the Offering  Termination  Date applicable
       thereto, in the names of the participant and one such other person as may
       be  designated  by the  participant,  as joint  tenants  with  rights  of
       survivorship or as tenants by the entireties,  to the extent permitted by
       applicable law.

10.03  Restrictions on Exercise.  The Board may, in its  discretion,  require as
       conditions  to the exercise of any option with respect to the  underlying
       shares that either:

       a.     A  registration  statement  under the  Securities  Act of 1933, as
              amended, with respect to said shares shall be effective, or

       b.     The participant shall have represented at the time of purchase, in
              form and substance  satisfactory to the Company, that it is his or
              her  intention to purchase the shares for  investment  and not for
              resale or distribution.

                                   ARTICLE XI
                                 ADMINISTRATION

11.01  Appointment  of  Committee.  The Board  shall  appoint a  committee  (the
       "Committee")  to administer  the Plan,  which shall be composed of two or
       more members who are non-employee directors as defined under Rule 16b - 3
       as promulgated by the  Securities and Exchange  Commission  under Section
       16(b) of the Exchange Act as amended from time to time or the Board.

11.02  Authority of  Committee.  Subject to the express  provisions of the Plan,
       the Committee shall have plenary authority in its discretion to interpret
       and  construe  any and all  provision  of the  Plan,  to adopt  rules and
       regulations for administering the Plan. The Committee's  determination of
       the foregoing matters shall be conclusive.

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11.03  Rules Governing the  Administration of the Committee.  The Board may from
       time to time appoint members of the Committee in  substitution  for or in
       addition to members previously appointed and may fill vacancies,  however
       caused, in the Committee.  The Committee may select one of its members as
       its  chairman,  shall  hold its  meetings  at such times and places as it
       shall   deem   advisable,   and  may  hold   telephonic   meetings.   All
       determinations  of the  Committee  shall  be  made by a  majority  of the
       members of the  Committee  shall be as fully  effective as if it had been
       made by a majority vote at a meeting duly called and held.  The Committee
       may appoint a Secretary and shall make such rules and regulations for the
       conduct of its business as it shall deem advisable.

                                   ARTICLE XII
                                  MISCELLANEOUS

12.01  Designation  of  Beneficiary.  A  participant  may  file  with  the  Plan
       Representative  a written  designation of a beneficiary who is to receive
       any  shares  of  Common  Stock  and/or  cash  under  the  Plan  upon  the
       participant's  death.  Such  designation of beneficiary may be changed by
       the participant at any time by written notice to the Plan Representative.
       Upon the death of a participant and receipt of by the Company of proof of
       identity  and  existence  at the  participant's  death  of a  beneficiary
       validly  designated  by the  participant  under the Plan,  and subject to
       Article VIII above concerning withdrawal from the Plan, the Company shall
       deliver such shares of Common Stock and/or cash to such  beneficiary.  In
       the event of the death of a  participant  lacking a  beneficiary  validly
       designated under the Plan who is living at the time of such participant's
       death,  the Company shall deliver such shares of Common Stock and/or cash
       to the executor or administrator of the estate of the participant,  or if
       no such executor or administrator has been appointed (to the knowledge of
       the Company), the Company, in its discretion,  may deliver such shares of
       Common Stock  and/or cash to the spouse or to any one or more  dependants
       of the  participant,  in each case  without any further  liability of the
       Company  whatsoever under or relating to the Plan. No beneficiary  shall,
       prior  to the  death  of the  participant  by  whom  he or she  has  been
       designated,  acquire any  interest in the shares of Common  Stock  and/or
       cash credited to the participant under the Plan.

12.02  Transferability. Neither payroll deductions credited to any participant's
       account  nor any  option or rights  with  regard to the  exercise  of any
       option  or to  receive  Common  Stock  under  the Plan  may be  assigned,
       transferred,  pledged,  or  otherwise  disposed  of in  any  way  by  the
       participant  other than by will or the laws of descent and  distribution.
       Any such  attempted  assignment,  transfer,  pledge or other  disposition
       shall be without effect,  except that the Company may, in its discretion,
       treat such act as an election to withdraw from  participation in the Plan
       in accordance with Section 8.01.

12.03  Use of Funds. All payroll deductions  received and/or held by the Company
       under

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       the Plan maybe used by the Company for any corporate purpose. The Company
       shall not be obligated to segregate such payroll deductions.

12.04  Adjustment Upon Changes in Capitalization.

       a.     If,  while  any  options  are  outstanding  under  the  Plan,  the
              outstanding  shares of Common Stock of the Company have increased,
              decreased,  changed into, or been exchanged for a different number
              or kind  of  shares  or  securities  of the  Company  through  any
              reorganization, merger, recapitalization,  reclassification, stock
              split, reverse stock split or similar transaction, appropriate and
              proportionate  adjustments  may be  made by the  Committee  in the
              number  and/or kind of shares which are subject to purchase  under
              outstanding  options and in the Option Price or Prices  applicable
              to such outstanding  options. In addition,  in any such event, the
              number and/or kind of shares which may be offered in the Offerings
              described  in  Article  IV hereof  shall  also be  proportionately
              adjusted.  No such adjustments  shall be made for or in respect to
              stock dividends.  For purposes of this paragraph, any distribution
              of shares of Common Stock to shareholders in an amount aggregating
              20% or more of the  outstanding  shares of Common  Stock  shall be
              deemed a stock split, and any  distribution of shares  aggregating
              less than 20% of the  outstanding  shares of Common Stock shall be
              deemed a stock dividend.

       b.     Upon the  dissolution  or  liquidation  of the Company,  or upon a
              reorganization, merger or consolidation of the Company with one or
              more  corporations  as a result  of which the  Company  is not the
              surviving corporation,  or upon a sale of substantially all of the
              property or capital  stock of the Company to another  corporation,
              the holder of each  option  then  outstanding  under the Plan will
              thereafter be entitled to receive at the next Offering Termination
              Date, upon the exercise of such option, for each share as to which
              such option shall be  exercised,  as nearly as  reasonably  may be
              determined, the cash, securities and/or property which a holder of
              one share of the Common  Stock was entitled to receive upon and at
              the time of such  transaction.  The Board shall take such steps in
              connection  with  such   transactions  as  the  Board  shall  deem
              necessary  to assure that the  provisions  of this  Section  12.04
              shall  thereafter be  applicable,  as nearly as reasonably  may be
              determined,  in  relation  to the  said  cash,  securities  and/or
              property  as to which each such  holder of any such  option  might
              hereafter be entitled to receive.

12.05  Amendment  and  Termination.  The Board  shall  have  complete  power and
       authority  to terminate or amend the Plan;  provided,  however,  that the
       Board shall not, without the approval of the shareholders of the Company,
       alter (i) the  aggregate  number of shares of Common  Stock  which may be
       issued under the Plan (except  pursuant to Section 12.04 above),  or (ii)
       the class of employees  eligible to receive options under the Plan, other
       than to designate additional Subsidiary Corporations as

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       Eligible Subsidiary Corporations;  and provided further, however, that no
       termination,  modification,  or  amendment  of the Plan may,  without the
       consent of an Employee  then having an option  under the Plan to purchase
       shares of Common  Stock,  adversely  affect the  rights of such  Employee
       under such option.

12.06  Effective  Date.  The Plan  shall  become  effective  as of May 9,  2000,
       subject to  approval by the holders of a majority of the shares of Common
       Stock  present and  represented  at any special or annual  meeting of the
       shareholders  of the Company duly held within 12 months after adoption of
       the Plan.  If the Plan is not so  approved,  the Plan  shall  not  become
       effective.

12.07  No Employment Rights.  The Plan does not, directly or indirectly,  create
       in any person any right with respect to continuation of employment by the
       Company  or any  Subsidiary  Corporation,  and it shall  not be deemed to
       interfere in any way with the Company's or any  Subsidiary  Corporation's
       right to terminate, or otherwise modify, any Employee's employment at any
       time.

12.08  Effect of Plan. The provisions of the Plan shall,  in accordance with its
       terms,  be binding upon,  and inure to the benefit of, all  successors of
       each Employee  participating in the Plan, including,  without limitation,
       such  Employee's  estate and the  executors,  administrators  or trustees
       thereof, heirs and legatees,  and any receiver,  trustee in bankruptcy or
       representative of creditors of such Employee.

12.09  Governing  Law.  The law of the State of New York will govern all matters
       relating  to this Plan  except to the extent  superseded  by the State of
       Delaware or the federal laws of the United States.

                                     Page 10<PAGE>   1

                                DIGITALTHINK, INC

                                       AND

                              WELLS FARGO & COMPANY

                                  RIGHTS AGENT

                        PREFERRED STOCK RIGHTS AGREEMENT

                         DATED AS OF SEPTEMBER 15, 2000

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                          TABLE OF CONTENTS
<TABLE>
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                                                                                               PAGE
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<S>                                                                                            <C>
Section 1.     Certain Definitions...............................................................1

Section 2.     Appointment of Rights Agent.......................................................7

Section 3.     Issuance of Rights Certificates...................................................7

Section 4.     Form of Rights Certificates.......................................................8

Section 5.     Countersignature and Registration.................................................9

Section 6.     Transfer, Split Up, Combination and Exchange of Rights Certificates;
               Mutilated, Destroyed, Lost or Stolen Rights Certificates.........................10

Section 7.     Exercise of Rights; Exercise Price; Expiration Date of Rights....................11

Section 8.     Cancellation and Destruction of Rights Certificates..............................13

Section 9.     Reservation and Availability of Preferred Shares.................................13

Section 10.    Record Date......................................................................14

Section 11.    Adjustment of Exercise Price, Number of Shares or Number of Rights...............14

Section 12.    Certificate of Adjusted Exercise Price or Number of Shares.......................21

Section 13.    Consolidation, Merger or Sale or Transfer of Assets or Earning Power.............21

Section 14.    Fractional Rights and Fractional Shares..........................................25

Section 15.    Rights of Action.................................................................26

Section 16.    Agreement of Rights Holders......................................................26

Section 17.    Rights Certificate Holder Not Deemed a Stockholder...............................27

Section 18.    Concerning the Rights Agent......................................................27

Section 19.    Merger or Consolidation or Change of Name of Rights Agent........................27

Section 20.    Duties of Rights Agent...........................................................28

Section 21.    Change of Rights Agent...........................................................30
</TABLE>

                                      -ii-
<PAGE>   3

                               TABLE OF CONTENTS
                                  (CONTINUED)

<TABLE>
<CAPTION>
                                                                                                PAGE
                                                                                                ----
<S>                                                                                             <C>
Section 22.    Issuance of New Rights Certificates..............................................31

Section 23.    Redemption.......................................................................31

Section 24.    Exchange.........................................................................32

Section 25.    Notice of Certain Events.........................................................34

Section 26.    Notices..........................................................................34

Section 27.    Supplements and Amendments.......................................................35

Section 28.    Successors.......................................................................36

Section 29.    Determinations and Actions by the Board of Directors, etc........................36

Section 30.    Benefits of this Agreement.......................................................36

Section 31.    Severability.....................................................................36

Section 32.    Governing Law....................................................................36

Section 33.    Counterparts.....................................................................37

Section 34.    Descriptive Headings.............................................................37
</TABLE>

EXHIBITS

<TABLE>
<S>            <C>
Exhibit A      Form of Certificate of Designation

Exhibit B      Form of Rights Certificate

Exhibit C      Summary of Rights
</TABLE>

                                     -iii-
<PAGE>   4

                        PREFERRED STOCK RIGHTS AGREEMENT

        This Preferred Stock Rights Agreement is dated as of September 15, 2000,
between DigitalThink, Inc. (the "Company"), a corporation, and Wells Fargo &
Company ("Rights Agent").

        On September 15, 2000 (the "RIGHTS DIVIDEND DECLARATION DATE"), the
Board of Directors of the Company authorized and declared a dividend of one
Preferred Share Purchase Right (a "RIGHT") for each Common Share (as hereinafter
defined) of the Company outstanding as of the Close of Business (as hereinafter
defined) on October 23, 2000 (the "RECORD DATE"), each Right representing the
right to purchase one one-thousandth (0.001) of a share of Series A
Participating Preferred Stock (as such number may be adjusted pursuant to the
provisions of this Agreement), having the rights, preferences and privileges set
forth in the form of Certificate of Designations of Rights, Preferences and
Privileges of Series A Participating Preferred Stock attached hereto as Exhibit
A, upon the terms and subject to the conditions herein set forth, and further
authorized and directed the issuance of one Right (as such number may be
adjusted pursuant to the provisions of this Agreement) with respect to each
Common Share that shall become outstanding between the Record Date and the
earlier of the Distribution Date and the Expiration Date (as such terms are
hereinafter defined), and in certain circumstances after the Distribution Date.

        NOW, THEREFORE, in consideration of the promises and the mutual
agreements herein set forth, the parties hereby agree as follows:

        Section 1. Certain Definitions. For purposes of this Agreement, the
following terms have the meanings indicated:

                (a) "ACQUIRING PERSON" shall mean any Person, other than H&Q
Venture Associates, LLC, who or which, together with all Affiliates and
Associates of such Person, shall be the Beneficial Owner of 15% or more of the
Common Shares then outstanding, but shall not include the Company, any
Subsidiary of the Company or any employee benefit plan of the Company or of any
Subsidiary of the Company, or any entity holding Common Shares for or pursuant
to the terms of any such plan. Notwithstanding the foregoing, no Person shall be
deemed to be an Acquiring Person as the result of an acquisition of Common
Shares by the Company which, by reducing the number of shares outstanding,
increases the proportionate number of shares beneficially owned by such Person
to 15% or more of the Common Shares of the Company then outstanding; provided,
however, that if a Person shall become the Beneficial Owner of 15% or more of
the Common Shares of the Company then outstanding by reason of share purchases
by the Company and shall, after such share purchases by the Company, become the
Beneficial Owner of any additional Common Shares of the Company (other than
pursuant to a dividend or distribution paid or made by the Company on the
outstanding Common Shares in Common Shares or pursuant to a split or subdivision
of the outstanding Common Shares), then such Person shall be deemed to be an
Acquiring Person unless upon becoming the Beneficial Owner of such additional
Common Shares of the Company such Person does not beneficially own 15% or more
of the Common Shares of the Company then

<PAGE>   5

outstanding. Notwithstanding the foregoing, (i) if the Company's Board of
Directors determines in good faith that a Person who would otherwise be an
"Acquiring Person," as defined pursuant to the foregoing provisions of this
paragraph (a), has become such inadvertently (including, without limitation,
because (A) such Person was unaware that it beneficially owned a percentage of
the Common Shares that would otherwise cause such Person to be an "Acquiring
Person," as defined pursuant to the foregoing provisions of this paragraph (a),
or (B) such Person was aware of the extent of the Common Shares it beneficially
owned but had no actual knowledge of the consequences of such beneficial
ownership under this Agreement) and without any intention of changing or
influencing control of the Company, and if such Person divested or divests as
promptly as practicable a sufficient number of Common Shares so that such Person
would no longer be an "Acquiring Person," as defined pursuant to the foregoing
provisions of this paragraph (a), then such Person shall not be deemed to be or
to have become an "Acquiring Person" for any purposes of this Agreement; and
(ii) if, as of the date hereof, any Person is the Beneficial Owner of 15% or
more of the Common Shares outstanding, such Person shall not be or become an
"Acquiring Person," as defined pursuant to the foregoing provisions of this
paragraph (a), unless and until such time as such Person shall become the
Beneficial Owner of additional Common Shares (other than pursuant to a dividend
or distribution paid or made by the Company on the outstanding Common Shares in
Common Shares or pursuant to a split or subdivision of the outstanding Common
Shares), unless, upon becoming the Beneficial Owner of such additional Common
Shares, such Person is not then the Beneficial Owner of 15% or more of the
Common Shares then outstanding.

                (b) "ADJUSTMENT FRACTION" shall have the meaning set forth in
Section 11(a)(i) hereof.

                (c) "AFFILIATE" and "ASSOCIATE" shall have the respective
meanings ascribed to such terms in Rule 12b-2 of the General Rules and
Regulations under the Exchange Act, as in effect on the date of this Agreement.

                (d) A Person shall be deemed the "BENEFICIAL OWNER" of and shall
be deemed to "BENEFICIALLY OWN" any securities:

                        (i) which such Person or any of such Person's Affiliates
or Associates beneficially owns, directly or indirectly, for purposes of Section
13(d) of the Exchange Act and Rule 13d-3 thereunder (or any comparable or
successor law or regulation);

                        (ii) which such Person or any of such Person's
Affiliates or Associates has (A) the right to acquire (whether such right is
exercisable immediately or only after the passage of time) pursuant to any
agreement, arrangement or understanding (other than customary agreements with
and between underwriters and selling group members with respect to a bona fide
public offering of securities), or upon the exercise of conversion rights,
exchange rights, rights (other than the Rights), warrants or options, or
otherwise; provided, however, that a Person shall not be deemed pursuant to this
Section 1(d)(ii)(A) to be the Beneficial Owner of, or to beneficially own, (1)
securities tendered pursuant to a tender or exchange offer made by or on behalf
of such Person or any of such Person's Affiliates or Associates until such
tendered securities are accepted for purchase or exchange, or (2) securities
which a Person or any of such Person's Affiliates or Associates may be

                                      -2-
<PAGE>   6

deemed to have the right to acquire pursuant to any merger or other acquisition
agreement between the Company and such Person (or one or more of its Affiliates
or Associates) if such agreement has been approved by the Board of Directors of
the Company prior to there being an Acquiring Person; or (B) the right to vote
pursuant to any agreement, arrangement or understanding; provided, however, that
a Person shall not be deemed the Beneficial Owner of, or to beneficially own,
any security under this Section 1(d)(ii)(B) if the agreement, arrangement or
understanding to vote such security (1) arises solely from a revocable proxy or
consent given to such Person in response to a public proxy or consent
solicitation made pursuant to, and in accordance with, the applicable rules and
regulations of the Exchange Act and (2) is not also then reportable on Schedule
13D under the Exchange Act (or any comparable or successor report); or

                        (iii) which are beneficially owned, directly or
indirectly, by any other Person (or any Affiliate or Associate thereof) with
which such Person or any of such Person's Affiliates or Associates has any
agreement, arrangement or understanding, whether or not in writing (other than
customary agreements with and between underwriters and selling group members
with respect to a bona fide public offering of securities) for the purpose of
acquiring, holding, voting (except to the extent contemplated by the proviso to
Section 1(d)(ii)(B)) or disposing of any securities of the Company; provided,
however, that in no case shall an officer or director of the Company be deemed
(x) the Beneficial Owner of any securities beneficially owned by another officer
or director of the Company solely by reason of actions undertaken by such
persons in their capacity as officers or directors of the Company or (y) the
Beneficial Owner of securities held of record by the trustee of any employee
benefit plan of the Company or any Subsidiary of the Company for the benefit of
any employee of the Company or any Subsidiary of the Company, other than the
officer or director, by reason of any influence that such officer or director
may have over the voting of the securities held in the plan.

                (e) "BUSINESS DAY" shall mean any day other than a Saturday,
Sunday or a day on which banking institutions in New York are authorized or
obligated by law or executive order to close.

                (f) "CLOSE OF BUSINESS" on any given date shall mean 5:00 P.
M., New York time, on such date; provided, however, that if such date is not a
Business Day it shall mean 5:00 P.M., New York time, on the next succeeding
Business Day.

                (g) "COMMON SHARES" when used with reference to the Company,
shall mean the shares of Common Stock of the Company, par value $0.001 per
share. Common Shares when used with reference to any Person other than the
Company, shall mean the capital stock (or equity interest) with the greatest
voting power of such other Person or, if such other Person is a Subsidiary of
another Person, the Person or Persons which ultimately control such
first-mentioned Person.

                (h) "COMMON STOCK EQUIVALENTS" shall have the meaning set
forth in Section 11(a)(iii) hereof.

                (i) "COMPANY" shall mean DigitalThink, Inc., a Delaware
corporation, subject to the terms of Section 13(a)(iii)(C) hereof.

                                      -3-
<PAGE>   7

                (j) "CURRENT PER SHARE MARKET PRICE" of any security (a
"Security" for purposes of this definition), for all computations other than
those made pursuant to Section 11(a)(iii) hereof, shall mean the average of the
daily closing prices per share of such Security for the thirty (30) consecutive
Trading Days immediately prior to such date, and for purposes of computations
made pursuant to Section 11(a)(iii) hereof, the Current Per Share Market Price
of any Security on any date shall be deemed to be the average of the daily
closing prices per share of such Security for the ten (10) consecutive Trading
Days immediately prior to such date; provided, however, that in the event that
the Current Per Share Market Price of the Security is determined during a period
following the announcement by the issuer of such Security of (i) a dividend or
distribution on such Security payable in shares of such Security or securities
convertible into such shares or (ii) any subdivision, combination or
reclassification of such Security, and prior to the expiration of the applicable
thirty (30) Trading Day or ten (10) Trading Day period, after the ex-dividend
date for such dividend or distribution, or the record date for such subdivision,
combination or reclassification, then, and in each such case, the Current Per
Share Market Price shall be appropriately adjusted to reflect the current market
price per share equivalent of such Security. The closing price for each day
shall be the last sale price, regular way, or, in case no such sale takes place
on such day, the average of the closing bid and asked prices, regular way, in
either case as reported in the principal consolidated transaction reporting
system with respect to securities listed or admitted to trading on the New York
Stock Exchange or, if the Security is not listed or admitted to trading on the
New York Stock Exchange, as reported in the principal consolidated transaction
reporting system with respect to securities listed on the principal national
securities exchange on which the Security is listed or admitted to trading or,
if the Security is not listed or admitted to trading on any national securities
exchange, the last sale price or, if such last sale price is not reported, the
average of the high bid and low asked prices in the over-the-counter market, as
reported by Nasdaq or such other system then in use, or, if on any such date the
Security is not quoted by any such organization, the average of the closing bid
and asked prices as furnished by a professional market maker making a market in
the Security selected by the Board of Directors of the Company. If on any such
date no market maker is making a market in the Security, the fair value of such
shares on such date as determined in good faith by the Board of Directors of the
Company shall be used. If the Preferred Shares are not publicly traded, the
Current Per Share Market Price of the Preferred Shares shall be conclusively
deemed to be the product of (x) the Current Per Share Market Price of the Common
Shares as determined pursuant to this Section 1(j), as appropriately adjusted to
reflect any stock split, stock dividend or similar transaction occurring after
the date hereof, multiplied by (y) 1000. If the Security is not publicly held or
so listed or traded, Current Per Share Market Price shall mean the fair value
per share as determined in good faith by the Board of Directors of the Company,
whose determination shall be described in a statement filed with the Rights
Agent and shall be conclusive for all purposes.

                (k) "CURRENT VALUE" shall have the meaning set forth in Section
11(a)(iii) hereof.

                (l) "DISTRIBUTION DATE" shall mean the earlier of (i) the Close
of Business on the tenth Business Day (or such later date as may be determined
by action of the Company's Board of Directors) after the Shares Acquisition Date
(or, if the tenth day after the Shares Acquisition Date occurs before the Record
Date, the Close of Business on the Record Date) or (ii) the Close of

                                      -4-
<PAGE>   8

Business on the tenth Business Day (or such later date as may be determined by
action of the Company's Board of Directors) after the date that a tender or
exchange offer by any Person (other than the Company, any Subsidiary of the
Company, any employee benefit plan of the Company or of any Subsidiary of the
Company, or any Person or entity organized, appointed or established by the
Company for or pursuant to the terms of any such plan) is first published or
sent or given within the meaning of Rule 14d-2(a) of the General Rules and
Regulations under the Exchange Act, if, assuming the successful consummation
thereof, such Person would be an Acquiring Person.

                (m) "EQUIVALENT SHARES" shall mean Preferred Shares and any
other class or series of capital stock of the Company which is entitled to the
same rights, privileges and preferences as the Preferred Shares.

                (n) "EXCHANGE ACT" shall mean the Securities Exchange Act of
1934, as amended.

                (o) "EXCHANGE RATIO" shall have the meaning set forth in Section
24(a) hereof.

                (p) "EXERCISE PRICE" shall have the meaning set forth in Section
4(a) hereof.

                (q) "EXPIRATION DATE" shall mean the earliest to occur of: (i)
the Close of Business on the Final Expiration Date, (ii) the Redemption Date, or
(iii) the time at which the Board of Directors orders the exchange of the Rights
as provided in Section 24 hereof.

                (r) "FINAL EXPIRATION DATE" shall mean October 23, 2010.

                (s) "NASDAQ" shall mean the National Association of Securities
Dealers, Inc. Automated Quotations System.

                (t) "PERSON" shall mean any individual, firm, corporation or
other entity, and shall include any successor (by merger or otherwise) of such
entity.

                (u) "POST-EVENT TRANSFEREE" shall have the meaning set forth in
Section 7(e) hereof.

                (v) "PREFERRED SHARES" shall mean shares of Series A
Participating Preferred Stock, par value $0.001 per share, of the Company.

                (w) "PRE-EVENT TRANSFEREE" shall have the meaning set forth in
Section 7(e) hereof.

                (x) "PRINCIPAL PARTY" shall have the meaning set forth in
Section 13(b) hereof.

                (y) "RECORD DATE" shall have the meaning set forth in the
recitals at the beginning of this Agreement.

                (z) "REDEMPTION DATE" shall have the meaning set forth in
Section 23(a) hereof.

                                      -5-
<PAGE>   9

                (aa) "REDEMPTION PRICE" shall have the meaning set forth in
Section 23(a) hereof.

                (bb) "RIGHTS AGENT" shall mean (i) Wells Fargo & Company, (ii)
its successor or replacement as provided in Sections 19 and 21 hereof or (iii)
any additional Person appointed pursuant to Section 2 hereof.

                (cc) "RIGHTS CERTIFICATE" shall mean a certificate substantially
in the form attached hereto as Exhibit B.

                (dd) "RIGHTS DIVIDEND DECLARATION DATE" shall have the meaning
set forth in the recitals at the beginning of this Agreement.

                (ee) "SECTION 11(a)(ii) TRIGGER DATE" shall have the meaning set
forth in Section 11(a)(iii) hereof.

                (ff) "SECTION 13 EVENT" shall mean any event described in clause
(i), (ii) or (iii) of Section 13(a) hereof.

                (gg) "SECURITIES ACT" shall mean the Securities Act of 1933, as
amended.

                (hh) "SHARES ACQUISITION DATE" shall mean the first date of
public announcement (which, for purposes of this definition, shall include,
without limitation, a report filed pursuant to Section 13(d) under the Exchange
Act) by the Company or an Acquiring Person that an Acquiring Person has become
such; provided that, if such Person is determined not to have become an
Acquiring Person pursuant to Section 1(a) hereof, then no Shares Acquisition
Date shall be deemed to have occurred.

                (ii) "SPREAD" shall have the meaning set forth in Section
11(a)(iii) hereof.

                (jj) "SUBSIDIARY" of any Person shall mean any corporation or
other entity of which an amount of voting securities sufficient to elect a
majority of the directors or Persons having similar authority of such
corporation or other entity is beneficially owned, directly or indirectly, by
such Person, or any corporation or other entity otherwise controlled by such
Person.

                (kk) "SUBSTITUTION PERIOD" shall have the meaning set forth in
Section 11(a)(iii) hereof.

                (ll) "SUMMARY OF RIGHTS" shall mean a summary of this Agreement
substantially in the form attached hereto as Exhibit C.

                (mm) "TOTAL EXERCISE PRICE" shall have the meaning set forth in
Section 4(a) hereof.

                (nn) "TRADING DAY" shall mean a day on which the principal
national securities exchange on which a referenced security is listed or
admitted to trading is open for the transaction of

                                      -6-
<PAGE>   10

business or, if a referenced security is not listed or admitted to trading on
any national securities exchange, a Business Day.

                (oo) A "TRIGGERING EVENT" shall be deemed to have occurred upon
any Person becoming an Acquiring Person.

        Section 2. Appointment of Rights Agent. The Company hereby appoints the
Rights Agent to act as agent for the Company and the holders of the Rights (who,
in accordance with Section 3 hereof, shall prior to the Distribution Date also
be the holders of the Common Shares) in accordance with the terms and conditions
hereof, and the Rights Agent hereby accepts such appointment. The Company may
from time to time appoint such co-Rights Agents as it may deem necessary or
desirable, upon ten (10) days' prior written notice to the Rights Agent. The
Rights Agent shall have no duty to supervise, and shall in no event be liable
for, the acts or omissions of any co-Rights Agent.

        Section 3. Issuance of Rights Certificates.

                (a) Until the Distribution Date, (i) the Rights will be
evidenced (subject to the provisions of Sections 3(b) and 3(c) hereof) by the
certificates for Common Shares registered in the names of the holders thereof
(which certificates shall also be deemed to be Rights Certificates) and not by
separate Rights Certificates and (ii) the right to receive Rights Certificates
will be transferable only in connection with the transfer of Common Shares.
Until the earlier of the Distribution Date or the Expiration Date, the surrender
for transfer of certificates for Common Shares shall also constitute the
surrender for transfer of the Rights associated with the Common Shares
represented thereby. As soon as practicable after the Distribution Date, the
Company will prepare and execute, the Rights Agent will countersign, and the
Company will send or cause to be sent (and the Rights Agent will, if requested,
send) by first-class, postage-prepaid mail, to each record holder of Common
Shares as of the Close of Business on the Distribution Date, at the address of
such holder shown on the records of the Company, a Rights Certificate evidencing
one Right for each Common Share so held, subject to adjustment as provided
herein. In the event that an adjustment in the number of Rights per Common Share
has been made pursuant to Section 11 hereof, then at the time of distribution of
the Rights Certificates, the Company shall make the necessary and appropriate
rounding adjustments (in accordance with Section 14(a) hereof) so that Rights
Certificates representing only whole numbers of Rights are distributed and cash
is paid in lieu of any fractional Rights. As of the Distribution Date, the
Rights will be evidenced solely by such Rights Certificates and may be
transferred by the transfer of the Rights Certificates as permitted hereby,
separately and apart from any transfer of Common Shares, and the holders of such
Rights Certificates as listed in the records of the Company or any transfer
agent or registrar for the Rights shall be the record holders thereof.

                (b) On the Record Date or as soon as practicable thereafter, the
Company will send a copy of the Summary of Rights by first-class,
postage-prepaid mail, to each record holder of Common Shares as of the Close of
Business on the Record Date, at the address of such holder shown on the records
of the Company's transfer agent and registrar. With respect to certificates for
Common Shares outstanding as of the Record Date, until the Distribution Date,
the Rights will be

                                      -7-
<PAGE>   11

evidenced by such certificates registered in the names of the holders thereof
together with the Summary of Rights.

                (c) Unless the Board of Directors by resolution adopted at or
before the time of the issuance of any Common Shares after the Record Date but
prior to the earlier of the Distribution Date or the Expiration Date (or, in
certain circumstances provided in Section 22 hereof, after the Distribution
Date) specifies to the contrary, Rights shall be issued in respect of all Common
Shares that are so issued, and Certificates representing such Common Shares
shall also be deemed to be certificates for Rights, and shall bear the following
legend:

        THIS CERTIFICATE ALSO EVIDENCES AND ENTITLES THE HOLDER HEREOF TO
        CERTAIN RIGHTS AS SET FORTH IN A RIGHTS AGREEMENT BETWEEN DIGITALTHINK,
        INC. AND WELLS FARGO & COMPANY, AS THE RIGHTS AGENT, DATED AS OF
        SEPTEMBER 15, 2000, (THE "RIGHTS AGREEMENT"), THE TERMS OF WHICH ARE
        HEREBY INCORPORATED HEREIN BY REFERENCE AND A COPY OF WHICH IS ON FILE
        AT THE PRINCIPAL EXECUTIVE OFFICES OF DIGITALTHINK, INC. UNDER CERTAIN
        CIRCUMSTANCES, AS SET FORTH IN THE RIGHTS AGREEMENT, SUCH RIGHTS WILL BE
        EVIDENCED BY SEPARATE CERTIFICATES AND WILL NO LONGER BE EVIDENCED BY
        THIS CERTIFICATE. DIGITALTHINK, INC. WILL MAIL TO THE HOLDER OF THIS
        CERTIFICATE A COPY OF THE RIGHTS AGREEMENT WITHOUT CHARGE AFTER RECEIPT
        OF A WRITTEN REQUEST THEREFOR. UNDER CERTAIN CIRCUMSTANCES SET FORTH IN
        THE RIGHTS AGREEMENT, RIGHTS ISSUED TO, OR HELD BY, ANY PERSON WHO IS,
        WAS OR BECOMES AN ACQUIRING PERSON OR ANY AFFILIATE OR ASSOCIATE THEREOF
        (AS SUCH TERMS ARE DEFINED IN THE RIGHTS AGREEMENT), WHETHER CURRENTLY
        HELD BY OR ON BEHALF OF SUCH PERSON OR BY ANY SUBSEQUENT HOLDER, MAY
        BECOME NULL AND VOID.

With respect to such certificates containing the foregoing legend, until the
earlier of the Distribution Date or the Expiration Date, the Rights associated
with the Common Shares represented by such certificates shall be evidenced by
such certificates alone, and the surrender for transfer of any such certificate
shall also constitute the transfer of the Rights associated with the Common
Shares represented thereby.

                (d) In the event that the Company purchases or acquires any
Common Shares after the Record Date but prior to the Distribution Date, any
Rights associated with such Common Shares shall be deemed canceled and retired
so that the Company shall not be entitled to exercise any Rights associated with
the Common Shares which are no longer outstanding.

        Section 4. Form of Rights Certificates.

                (a) The Rights Certificates (and the forms of election to
purchase Common Shares and of assignment to be printed on the reverse thereof)
shall be substantially in the form of

                                      -8-
<PAGE>   12

Exhibit B hereto and may have such marks of identification or designation and
such legends, summaries or endorsements printed thereon as the Company may deem
appropriate and as are not inconsistent with the provisions of this Agreement,
or as may be required to comply with any applicable law or with any rule or
regulation made pursuant thereto or with any rule or regulation of any stock
exchange or a national market system, on which the Rights may from time to time
be listed or included, or to conform to usage. Subject to the provisions of
Section 11 and Section 22 hereof, the Rights Certificates, whenever distributed,
shall be dated as of the Record Date (or in the case of Rights issued with
respect to Common Shares issued by the Company after the Record Date, as of the
date of issuance of such Common Shares) and on their face shall entitle the
holders thereof to purchase such number of one-thousandths of a Preferred Share
as shall be set forth therein at the price set forth therein (such exercise
price per one one-thousandth of a Preferred Share being hereinafter referred to
as the "EXERCISE PRICE" and the aggregate Exercise Price of all Preferred Shares
issuable upon exercise of one Right being hereinafter referred to as the "TOTAL
EXERCISE PRICE"), but the number and type of securities purchasable upon the
exercise of each Right and the Exercise Price shall be subject to adjustment as
provided herein.

                (b) Any Rights Certificate issued pursuant to Section 3(a) or
Section 22 hereof that represents Rights beneficially owned by: (i) an Acquiring
Person or any Associate or Affiliate of an Acquiring Person, (ii) a Post-Event
Transferee, (iii) a Pre-Event Transferee or (iv) any subsequent transferee
receiving transferred Rights from a Post-Event Transferee or a Pre-Event
Transferee, either directly or through one or more intermediate transferees, and
any Rights Certificate issued pursuant to Section 6 or Section 11 hereof upon
transfer, exchange, replacement or adjustment of any other Rights Certificate
referred to in this sentence, shall contain (to the extent feasible) the
following legend:

        THE RIGHTS REPRESENTED BY THIS RIGHTS CERTIFICATE ARE OR WERE
        BENEFICIALLY OWNED BY A PERSON WHO WAS OR BECAME AN ACQUIRING PERSON OR
        AN AFFILIATE OR ASSOCIATE OF AN ACQUIRING PERSON (AS SUCH TERMS ARE
        DEFINED IN THE RIGHTS AGREEMENT). ACCORDINGLY, THIS RIGHTS CERTIFICATE
        AND THE RIGHTS REPRESENTED HEREBY MAY BECOME NULL AND VOID IN THE
        CIRCUMSTANCES SPECIFIED IN SECTION 7(e) OF THE RIGHTS AGREEMENT.

        Section 5. Countersignature and Registration.

                (a) The Rights Certificates shall be executed on behalf of the
Company by its Chairman of the Board, its Chief Executive Officer, its Chief
Financial Officer, its President or any Vice President, either manually or by
facsimile signature, and by the Secretary or an Assistant Secretary of the
Company, either manually or by facsimile signature, and shall have affixed
thereto the Company's seal (if any) or a facsimile thereof. The Rights
Certificates shall be manually countersigned by the Rights Agent and shall not
be valid for any purpose unless countersigned. In case any officer of the
Company who shall have signed any of the Rights Certificates shall cease to be
such officer of the Company before countersignature by the Rights Agent and
issuance and

                                      -9-
<PAGE>   13

delivery by the Company, such Rights Certificates, nevertheless, may be
countersigned by the Rights Agent and issued and delivered by the Company with
the same force and effect as though the person who signed such Rights
Certificates on behalf of the Company had not ceased to be such officer of the
Company; and any Rights Certificate may be signed on behalf of the Company by
any person who, at the actual date of the execution of such Rights Certificate,
shall be a proper officer of the Company to sign such Rights Certificate,
although at the date of the execution of this Rights Agreement any such person
was not such an officer.

                (b) Following the Distribution Date, the Rights Agent will keep
or cause to be kept, at its office designated for such purposes, books for
registration and transfer of the Rights Certificates issued hereunder. Such
books shall show the names and addresses of the respective holders of the Rights
Certificates, the number of Rights evidenced on its face by each of the Rights
Certificates and the date of each of the Rights Certificates.

        Section 6. Transfer, Split Up, Combination and Exchange of Rights
Certificates; Mutilated, Destroyed, Lost or Stolen Rights Certificates.

                (a) Subject to the provisions of Sections 7(e), 14 and 24
hereof, at any time after the Close of Business on the Distribution Date, and at
or prior to the Close of Business on the Expiration Date, any Rights Certificate
or Rights Certificates may be transferred, split up, combined or exchanged for
another Rights Certificate or Rights Certificates, entitling the registered
holder to purchase a like number of one-thousandths of a Preferred Share (or,
following a Triggering Event, other securities, cash or other assets, as the
case may be) as the Rights Certificate or Rights Certificates surrendered then
entitled such holder to purchase. Any registered holder desiring to transfer,
split up, combine or exchange any Rights Certificate or Rights Certificates
shall make such request in writing delivered to the Rights Agent, and shall
surrender the Rights Certificate or Rights Certificates to be transferred, split
up, combined or exchanged at the office of the Rights Agent designated for such
purpose. Neither the Rights Agent nor the Company shall be obligated to take any
action whatsoever with respect to the transfer of any such surrendered Rights
Certificate until the registered holder shall have completed and signed the
certificate contained in the form of assignment on the reverse side of such
Rights Certificate and shall have provided such additional evidence of the
identity of the Beneficial Owner (or former Beneficial Owner) or Affiliates or
Associates thereof as the Company shall reasonably request. Thereupon the Rights
Agent shall, subject to Sections 7(e), 14 and 24 hereof, countersign and deliver
to the person entitled thereto a Rights Certificate or Rights Certificates, as
the case may be, as so requested. The Company may require payment of a sum
sufficient to cover any tax or governmental charge that may be imposed in
connection with any transfer, split up, combination or exchange of Rights
Certificates.

                (b) Upon receipt by the Company and the Rights Agent of evidence
reasonably satisfactory to them of the loss, theft, destruction or mutilation of
a Rights Certificate, and, in case of loss, theft or destruction, of indemnity
or security reasonably satisfactory to them, and, at the Company's request,
reimbursement to the Company and the Rights Agent of all reasonable expenses
incidental thereto, and upon surrender to the Rights Agent and cancellation of
the Rights Certificate if mutilated, the Company will make and deliver a new
Rights Certificate of like tenor to the Rights

                                      -10-
<PAGE>   14

Agent for delivery to the registered holder in lieu of the Rights Certificate so
lost, stolen, destroyed or mutilated.

        Section 7. Exercise of Rights; Exercise Price; Expiration Date of
Rights.

                (a) Subject to Sections 7(e), 23(b) and 24(b) hereof, the
registered holder of any Rights Certificate may exercise the Rights evidenced
thereby (except as otherwise provided herein) in whole or in part at any time
after the Distribution Date and prior to the Close of Business on the Expiration
Date by surrender of the Rights Certificate, with the form of election to
purchase on the reverse side thereof duly executed, to the Rights Agent at the
office of the Rights Agent designated for such purpose, together with payment of
the Exercise Price for each one-thousandth of a Preferred Share (or, following a
Triggering Event, other securities, cash or other assets as the case may be) as
to which the Rights are exercised.

                (b) The Exercise Price for each one-thousandth of a Preferred
Share issuable pursuant to the exercise of a Right shall initially be
Two-Hundred Fifty Dollars ($250.00), shall be subject to adjustment from time to
time as provided in Sections 11 and 13 hereof and shall be payable in lawful
money of the United States of America in accordance with paragraph (c) below.

                (c) Upon receipt of a Rights Certificate representing
exercisable Rights, with the form of election to purchase duly executed,
accompanied by payment of the Exercise Price for the number of one-thousandths
of a Preferred Share (or, following a Triggering Event, other securities, cash
or other assets as the case may be) to be purchased and an amount equal to any
applicable transfer tax required to be paid by the holder of such Rights
Certificate in accordance with Section 9(e) hereof, the Rights Agent shall,
subject to Section 20(k) hereof, thereupon promptly (i) (A) requisition from any
transfer agent of the Preferred Shares (or make available, if the Rights Agent
is the transfer agent for the Preferred Shares) a certificate or certificates
for the number of one-thousandths of a Preferred Share (or, following a
Triggering Event, other securities, cash or other assets as the case may be) to
be purchased and the Company hereby irrevocably authorizes its transfer agent to
comply with all such requests or (B) if the Company shall have elected to
deposit the total number of one-thousandths of a Preferred Share (or, following
a Triggering Event, other securities, cash or other assets as the case may be)
issuable upon exercise of the Rights hereunder with a depositary agent,
requisition from the depositary agent depositary receipts representing such
number of one-thousandths of a Preferred Share (or, following a Triggering
Event, other securities, cash or other assets as the case may be) as are to be
purchased (in which case certificates for the Preferred Shares (or, following a
Triggering Event, other securities, cash or other assets as the case may be)
represented by such receipts shall be deposited by the transfer agent with the
depositary agent) and the Company hereby directs the depositary agent to comply
with such request, (ii) when appropriate, requisition from the Company the
amount of cash to be paid in lieu of issuance of fractional shares in accordance
with Section 14 hereof, (iii) after receipt of such certificates or depositary
receipts, cause the same to be delivered to or upon the order of the registered
holder of such Rights Certificate, registered in such name or names as may be
designated by such holder and (iv) when appropriate, after receipt thereof,
deliver such cash to or upon the order of the registered holder of such Rights
Certificate. The payment of the Exercise Price (as such amount may be

                                      -11-
<PAGE>   15

reduced (including to zero) pursuant to Section 11(a)(iii) hereof) and an amount
equal to any applicable transfer tax required to be paid by the holder of such
Rights Certificate in accordance with Section 9(e) hereof, may be made in cash
or by certified bank check, cashier's check or bank draft payable to the order
of the Company. In the event that the Company is obligated to issue securities
of the Company other than Preferred Shares, pay cash and/or distribute other
property pursuant to Section 11(a) hereof, the Company will make all
arrangements necessary so that such other securities, cash and/or other property
are available for distribution by the Rights Agent, if and when appropriate.

                (d) In case the registered holder of any Rights Certificate
shall exercise less than all the Rights evidenced thereby, a new Rights
Certificate evidencing Rights equivalent to the Rights remaining unexercised
shall be issued by the Rights Agent to the registered holder of such Rights
Certificate or to his or her duly authorized assigns, subject to the provisions
of Section 14 hereof.

                (e) Notwithstanding anything in this Agreement to the contrary,
from and after the first occurrence of a Triggering Event, any Rights
beneficially owned by (i) an Acquiring Person or an Associate or Affiliate of an
Acquiring Person, (ii) a transferee of an Acquiring Person (or of any such
Associate or Affiliate) who becomes a transferee after the Acquiring Person
becomes such (a "POST-EVENT TRANSFEREE"), (iii) a transferee of an Acquiring
Person (or of any such Associate or Affiliate) who becomes a transferee prior to
or concurrently with the Acquiring Person becoming such and receives such Rights
pursuant to either (A) a transfer (whether or not for consideration) from the
Acquiring Person to holders of equity interests in such Acquiring Person or to
any Person with whom the Acquiring Person has any continuing agreement,
arrangement or understanding regarding the transferred Rights or (B) a transfer
which the Company's Board of Directors has determined is part of a plan,
arrangement or understanding which has as a primary purpose or effect the
avoidance of this Section 7(e) (a "PRE-EVENT TRANSFEREE") or (iv) any subsequent
transferee receiving transferred Rights from a Post-Event Transferee or a
Pre-Event Transferee, either directly or through one or more intermediate
transferees, shall become null and void without any further action and no holder
of such Rights shall have any rights whatsoever with respect to such Rights,
whether under any provision of this Agreement or otherwise. The Company shall
use all reasonable efforts to ensure that the provisions of this Section 7(e)
and Section 4(b) hereof are complied with, but shall have no liability to any
holder of Rights Certificates or to any other Person as a result of its failure
to make any determinations with respect to an Acquiring Person or any of such
Acquiring Person's Affiliates, Associates or transferees hereunder.

                (f) Notwithstanding anything in this Agreement to the contrary,
neither the Rights Agent nor the Company shall be obligated to undertake any
action with respect to a registered holder upon the occurrence of any purported
exercise as set forth in this Section 7 unless such registered holder shall, in
addition to having complied with the requirements of Section 7(a), have (i)
completed and signed the certificate contained in the form of election to
purchase set forth on the reverse side of the Rights Certificate surrendered for
such exercise and (ii) provided such additional evidence of the identity of the
Beneficial Owner (or former Beneficial Owner) or Affiliates or Associates
thereof as the Company shall reasonably request.

                                      -12-
<PAGE>   16

        Section 8. Cancellation and Destruction of Rights Certificates. All
Rights Certificates surrendered for the purpose of exercise, transfer, split up,
combination or exchange shall, if surrendered to the Company or to any of its
agents, be delivered to the Rights Agent for cancellation or in canceled form,
or, if surrendered to the Rights Agent, shall be canceled by it, and no Rights
Certificates shall be issued in lieu thereof except as expressly permitted by
any of the provisions of this Agreement. The Company shall deliver to the Rights
Agent for cancellation and retirement, and the Rights Agent shall so cancel and
retire, any Rights Certificate purchased or acquired by the Company otherwise
than upon the exercise thereof. The Rights Agent shall deliver all canceled
Rights Certificates to the Company.

        Section 9. Reservation and Availability of Preferred Shares.

                (a) The Company covenants and agrees that it will use its best
efforts to cause to be reserved and kept available out of its authorized and
unissued Preferred Shares not reserved for another purpose (and, following the
occurrence of a Triggering Event, out of its authorized and unissued Common
Shares and/or other securities), the number of Preferred Shares (and, following
the occurrence of the Triggering Event, Common Shares and/or other securities)
that will be sufficient to permit the exercise in full of all outstanding
Rights.

                (b) If the Company shall hereafter list any of its Preferred
Shares on a national securities exchange, then so long as the Preferred Shares
(and, following the occurrence of a Triggering Event, Common Shares and/or other
securities) issuable and deliverable upon exercise of the Rights may be listed
on such exchange, the Company shall use its best efforts to cause, from and
after such time as the Rights become exercisable (but only to the extent that it
is reasonably likely that the Rights will be exercised), all shares reserved for
such issuance to be listed on such exchange upon official notice of issuance
upon such exercise.

                (c) The Company shall use its best efforts to (i) file, as soon
as practicable following the earliest date after the first occurrence of a
Triggering Event in which the consideration to be delivered by the Company upon
exercise of the Rights is described in Section 11(a)(ii) or Section 11(a)(iii)
hereof, or as soon as is required by law following the Distribution Date, as the
case may be, a registration statement under the Securities Act with respect to
the securities purchasable upon exercise of the Rights on an appropriate form,
(ii) cause such registration statement to become effective as soon as
practicable after such filing and (iii) cause such registration statement to
remain effective (with a prospectus at all times meeting the requirements of the
Securities Act) until the earlier of (A) the date as of which the Rights are no
longer exercisable for such securities and (B) the date of expiration of the
Rights. The Company may temporarily suspend, for a period not to exceed ninety
(90) days after the date set forth in clause (i) of the first sentence of this
Section 9(c), the exercisability of the Rights in order to prepare and file such
registration statement and permit it to become effective. Upon any such
suspension, the Company shall issue a public announcement stating, and notify
the Rights Agent, that the exercisability of the Rights has been temporarily
suspended, as well as a public announcement and notification to the Rights Agent
at such time as the suspension is no longer in effect. The Company will also
take such action as may be appropriate under, or to ensure compliance with, the
securities or "blue sky" laws of the various states in

                                      -13-
<PAGE>   17

connection with the exercisability of the Rights. Notwithstanding any provision
of this Agreement to the contrary, the Rights shall not be exercisable in any
jurisdiction, unless the requisite qualification in such jurisdiction shall have
been obtained, or an exemption therefrom shall be available, and until a
registration statement has been declared and remains effective.

                (d) The Company covenants and agrees that it will take all such
action as may be necessary to ensure that all Preferred Shares (or other
securities of the Company) delivered upon exercise of Rights shall, at the time
of delivery of the certificates for such securities (subject to payment of the
Exercise Price), be duly and validly authorized and issued and fully paid and
nonassessable.

                (e) The Company further covenants and agrees that it will pay
when due and payable any and all federal and state transfer taxes and charges
which may be payable in respect of the original issuance or delivery of the
Rights Certificates or of any Preferred Shares (or other securities of the
Company) upon the exercise of Rights. The Company shall not, however, be
required to pay any transfer tax which may be payable in respect of any transfer
or delivery of Rights Certificates to a person other than, or the issuance or
delivery of certificates or depositary receipts for the Preferred Shares (or
other securities of the Company) in a name other than that of, the registered
holder of the Rights Certificate evidencing Rights surrendered for exercise or
to issue or to deliver any certificates or depositary receipts for Preferred
Shares (or other securities of the Company) upon the exercise of any Rights
until any such tax shall have been paid (any such tax being payable by the
holder of such Rights Certificate at the time of surrender) or until it has been
established to the Company's satisfaction that no such tax is due.

        Section 10. Record Date. Each Person in whose name any certificate for a
number of one-thousandths of a Preferred Share (or other securities of the
Company) is issued upon the exercise of Rights shall for all purposes be deemed
to have become the holder of record of Preferred Shares (or other securities of
the Company) represented thereby on, and such certificate shall be dated, the
date upon which the Rights Certificate evidencing such Rights was duly
surrendered and payment of the Total Exercise Price with respect to which the
Rights have been exercised (and any applicable transfer taxes) was made;
provided, however, that if the date of such surrender and payment is a date upon
which the transfer books of the Company are closed, such Person shall be deemed
to have become the record holder of such shares on, and such certificate shall
be dated, the next succeeding Business Day on which the transfer books of the
Company are open. Prior to the exercise of the Rights evidenced thereby, the
holder of a Rights Certificate shall not be entitled to any rights of a holder
of Preferred Shares (or other securities of the Company) for which the Rights
shall be exercisable, including, without limitation, the right to vote, to
receive dividends or other distributions or to exercise any preemptive rights,
and shall not be entitled to receive any notice of any proceedings of the
Company, except as provided herein.

        Section 11. Adjustment of Exercise Price, Number of Shares or Number of
Rights. The Exercise Price, the number and kind of shares or other property
covered by each Right and the number of Rights outstanding are subject to
adjustment from time to time as provided in this Section 11.

                                      -14-
<PAGE>   18

                (a) (i) Anything in this Agreement to the contrary
notwithstanding, in the event that the Company shall at any time after the date
of this Agreement (A) declare a dividend on the Preferred Shares payable in
Preferred Shares, (B) subdivide the outstanding Preferred Shares, (C) combine
the outstanding Preferred Shares (by reverse stock split or otherwise) into a
smaller number of Preferred Shares, or (D) issue any shares of its capital stock
in a reclassification of the Preferred Shares (including any such
reclassification in connection with a consolidation or merger in which the
Company is the continuing or surviving corporation), then, in each such event,
except as otherwise provided in this Section 11 and Section 7(e) hereof: (1) the
Exercise Price in effect at the time of the record date for such dividend or of
the effective date of such subdivision, combination or reclassification shall be
adjusted so that the Exercise Price thereafter shall equal the result obtained
by dividing the Exercise Price in effect immediately prior to such time by a
fraction (the "ADJUSTMENT FRACTION"), the numerator of which shall be the total
number of Preferred Shares (or shares of capital stock issued in such
reclassification of the Preferred Shares) outstanding immediately following such
time and the denominator of which shall be the total number of Preferred Shares
outstanding immediately prior to such time; provided, however, that in no event
shall the consideration to be paid upon the exercise of one Right be less than
the aggregate par value of the shares of capital stock of the Company issuable
upon exercise of such Right; and (2) the number of one-thousandths of a
Preferred Share (or share of such other capital stock) issuable upon the
exercise of each Right shall equal the number of one-thousandths of a Preferred
Share (or share of such other capital stock) as was issuable upon exercise of a
Right immediately prior to the occurrence of the event described in clauses
(A)-(D) of this Section 11(a)(i), multiplied by the Adjustment Fraction;
provided, however, that, no such adjustment shall be made pursuant to this
Section 11(a)(i) to the extent that there shall have simultaneously occurred an
event described in clause (A), (B), (C) or (D) of Section 11(n) with a
proportionate adjustment being made thereunder. Each Common Share that shall
become outstanding after an adjustment has been made pursuant to this Section
11(a)(i) shall have associated with it the number of Rights, exercisable at the
Exercise Price and for the number of one-thousandths of a Preferred Share (or
shares of such other capital stock) as one Common Share has associated with it
immediately following the adjustment made pursuant to this Section 11(a)(i).

                (ii) Subject to Section 24 of this Agreement, in the event that
a Triggering Event shall have occurred, then promptly following such Triggering
Event each holder of a Right, except as provided in Section 7(e) hereof, shall
thereafter have the right to receive for each Right, upon exercise thereof in
accordance with the terms of this Agreement and payment of the Exercise Price in
effect immediately prior to the occurrence of the Triggering Event, in lieu of a
number of one-thousandths of a Preferred Share, such number of Common Shares of
the Company as shall equal the quotient obtained by dividing (A) the product
obtained by multiplying (1) the Exercise Price in effect immediately prior to
the occurrence of the Triggering Event by (2) the number of one-thousandths of a
Preferred Share for which a Right was exercisable (or would have been
exercisable if the Distribution Date had occurred) immediately prior to the
first occurrence of a Triggering Event, by (B) 50% of the Current Per Share
Market Price for Common Shares on the date of occurrence of the Triggering
Event; provided, however, that the Exercise Price and the number of Common
Shares of the Company so receivable upon exercise of a Right shall be subject to
further

                                      -15-
<PAGE>   19

adjustment as appropriate in accordance with Section 11(e) hereof to reflect any
events occurring in respect of the Common Shares of the Company after the
occurrence of the Triggering Event.

                (iii) In lieu of issuing Common Shares in accordance with
Section 11(a)(ii) hereof, the Company may, if the Company's Board of Directors
determines that such action is necessary or appropriate and not contrary to the
interest of holders of Rights and, in the event that the number of Common Shares
which are authorized by the Company's Certificate of Incorporation but not
outstanding or reserved for issuance for purposes other than upon exercise of
the Rights are not sufficient to permit the exercise in full of the Rights, or
if any necessary regulatory approval for such issuance has not been obtained by
the Company, the Company shall: (A) determine the excess of (1) the value of the
Common Shares issuable upon the exercise of a Right (the "CURRENT VALUE") over
(2) the Exercise Price (such excess, the "SPREAD") and (B) with respect to each
Right, make adequate provision to substitute for such Common Shares, upon
exercise of the Rights, (1) cash, (2) a reduction in the Exercise Price, (3)
other equity securities of the Company (including, without limitation, shares or
units of shares of any series of preferred stock which the Company's Board of
Directors has deemed to have the same value as Common Shares (such shares or
units of shares of preferred stock are herein called "COMMON STOCK
EQUIVALENTS")), except to the extent that the Company has not obtained any
necessary stockholder or regulatory approval for such issuance, (4) debt
securities of the Company, except to the extent that the Company has not
obtained any necessary stockholder or regulatory approval for such issuance, (5)
other assets or (6) any combination of the foregoing, having an aggregate value
equal to the Current Value, where such aggregate value has been determined by
the Company's Board of Directors based upon the advice of a nationally
recognized investment banking firm selected by the Company's Board of Directors;
provided, however, that if the Company shall not have made adequate provision to
deliver value pursuant to clause (B) above within thirty (30) days following the
later of (x) the first occurrence of a Triggering Event and (y) the date on
which the Company's right of redemption pursuant to Section 23(a) expires (the
later of (x) and (y) being referred to herein as the "SECTION 11(a)(ii) TRIGGER
DATE"), then the Company shall be obligated to deliver, upon the surrender for
exercise of a Right and without requiring payment of the Exercise Price, Common
Shares (to the extent available), except to the extent that the Company has not
obtained any necessary stockholder or regulatory approval for such issuance, and
then, if necessary, cash, which shares and/or cash have an aggregate value equal
to the Spread. If the Company's Board of Directors shall determine in good faith
that it is likely that sufficient additional Common Shares could be authorized
for issuance upon exercise in full of the Rights or that any necessary
regulatory approval for such issuance will be obtained, the thirty (30) day
period set forth above may be extended to the extent necessary, but not more
than ninety (90) days after the Section 11(a)(ii) Trigger Date, in order that
the Company may seek stockholder approval for the authorization of such
additional shares or take action to obtain such regulatory approval (such
period, as it may be extended, the "SUBSTITUTION PERIOD"). To the extent that
the Company determines that some action need be taken pursuant to the first
and/or second sentences of this Section 11(a)(iii), the Company (x) shall
provide, subject to Section 7(e) hereof, that such action shall apply uniformly
to all outstanding Rights and (y) may suspend the exercisability of the Rights
until the expiration of the Substitution Period in order to seek any
authorization of additional shares, to take any action to obtain any required
regulatory approval and/or to decide the appropriate form of distribution to be
made pursuant to such first sentence and

                                      -16-
<PAGE>   20

to determine the value thereof. In the event of any such suspension, the Company
shall issue a public announcement stating that the exercisability of the Rights
has been temporarily suspended, as well as a public announcement at such time as
the suspension is no longer in effect. For purposes of this Section 11(a)(iii),
the value of the Common Shares shall be the Current Per Share Market Price of
the Common Shares on the Section 11(a)(ii) Trigger Date and the value of any
Common Stock Equivalent shall be deemed to have the same value as the Common
Shares on such date.

                (b) In case the Company shall, at any time after the date of
this Agreement, fix a record date for the issuance of rights, options or
warrants to all holders of Preferred Shares entitling such holders (for a period
expiring within forty-five (45) calendar days after such record date) to
subscribe for or purchase Preferred Shares or Equivalent Shares or securities
convertible into Preferred Shares or Equivalent Shares at a price per share (or
having a conversion price per share, if a security convertible into Preferred
Shares or Equivalent Shares) less than the then Current Per Share Market Price
of the Preferred Shares or Equivalent Shares on such record date, then, in each
such case, the Exercise Price to be in effect after such record date shall be
determined by multiplying the Exercise Price in effect immediately prior to such
record date by a fraction, the numerator of which shall be the number of
Preferred Shares and Equivalent Shares (if any) outstanding on such record date,
plus the number of Preferred Shares or Equivalent Shares, as the case may be,
which the aggregate offering price of the total number of Preferred Shares or
Equivalent Shares, as the case may be, to be offered or issued (and/or the
aggregate initial conversion price of the convertible securities to be offered
or issued) would purchase at such current market price, and the denominator of
which shall be the number of Preferred Shares and Equivalent Shares (if any)
outstanding on such record date, plus the number of additional Preferred Shares
or Equivalent Shares, as the case may be, to be offered for subscription or
purchase (or into which the convertible securities so to be offered are
initially convertible); provided, however, that in no event shall the
consideration to be paid upon the exercise of one Right be less than the
aggregate par value of the shares of capital stock of the Company issuable upon
exercise of one Right. In case such subscription price may be paid in a
consideration part or all of which shall be in a form other than cash, the value
of such consideration shall be as determined in good faith by the Company's
Board of Directors, whose determination shall be described in a statement filed
with the Rights Agent and shall be binding on the Rights Agent and the holders
of the Rights. Preferred Shares and Equivalent Shares owned by or held for the
account of the Company shall not be deemed outstanding for the purpose of any
such computation. Such adjustment shall be made successively whenever such a
record date is fixed, and in the event that such rights, options or warrants are
not so issued, the Exercise Price shall be adjusted to be the Exercise Price
which would then be in effect if such record date had not been fixed.

                (c) In case the Company shall, at any time after the date of
this Agreement, fix a record date for the making of a distribution to all
holders of the Preferred Shares or of any class or series of Equivalent Shares
(including any such distribution made in connection with a consolidation or
merger in which the Company is the continuing or surviving corporation) of
evidences of indebtedness or assets (other than a regular quarterly cash
dividend, if any, or a dividend payable in Preferred Shares) or subscription
rights, options or warrants (excluding those referred to in Section 11(b)),
then, in each such case, the Exercise Price to be in effect after such record
date shall

                                      -17-
<PAGE>   21

be determined by multiplying the Exercise Price in effect immediately prior to
such record date by a fraction, the numerator of which shall be the Current Per
Share Market Price of a Preferred Share or an Equivalent Share on such record
date, less the fair market value per Preferred Share or Equivalent Share (as
determined in good faith by the Board of Directors of the Company, whose
determination shall be described in a statement filed with the Rights Agent) of
the portion of the cash, assets or evidences of indebtedness so to be
distributed or of such subscription rights or warrants applicable to a Preferred
Share or Equivalent Share, as the case may be, and the denominator of which
shall be such Current Per Share Market Price of a Preferred Share or Equivalent
Share on such record date; provided, however, that in no event shall the
consideration to be paid upon the exercise of one Right be less than the
aggregate par value of the shares of capital stock of the Company issuable upon
exercise of one Right. Such adjustments shall be made successively whenever such
a record date is fixed, and in the event that such distribution is not so made,
the Exercise Price shall be adjusted to be the Exercise Price which would have
been in effect if such record date had not been fixed.

                (d) Anything herein to the contrary notwithstanding, no
adjustment in the Exercise Price shall be required unless such adjustment would
require an increase or decrease of at least one percent (1.0%) of the Exercise
Price; provided, however, that any adjustments which by reason of this Section
11(d) are not required to be made shall be carried forward and taken into
account in any subsequent adjustment. All calculations under this Section 11
shall be made to the nearest cent or to the nearest ten-thousandth of a Common
Share or other share or one hundred-thousandth of a Preferred Share, as the case
may be. Notwithstanding the first sentence of this Section 11(d), any adjustment
required by this Section 11 shall be made no later than the earlier of (i) three
(3) years from the date of the transaction which requires such adjustment or
(ii) the Expiration Date.

                (e) If as a result of an adjustment made pursuant to Section
11(a) or Section 13(a) hereof, the holder of any Right thereafter exercised
shall become entitled to receive any shares of capital stock other than
Preferred Shares, thereafter the number of such other shares so receivable upon
exercise of any Right and, if required, the Exercise Price thereof, shall be
subject to adjustment from time to time in a manner and on terms as nearly
equivalent as practicable to the provisions with respect to the Preferred Shares
contained in Sections 11(a), 11(b), 11(c), 11(d), 11(g), 11(h), 11(i), 11(j),
11(k) and 11(l), and the provisions of Sections 7, 9, 10, 13 and 14 with respect
to the Preferred Shares shall apply on like terms to any such other shares.

                (f) All Rights originally issued by the Company subsequent to
any adjustment made to the Exercise Price hereunder shall evidence the right to
purchase, at the adjusted Exercise Price, the number of one-thousandths of a
Preferred Share purchasable from time to time hereunder upon exercise of the
Rights, all subject to further adjustment as provided herein.

                (g) Unless the Company shall have exercised its election as
provided in Section 11(h), upon each adjustment of the Exercise Price as a
result of the calculations made in Section 11(b) and (c), each Right outstanding
immediately prior to the making of such adjustment shall thereafter evidence the
right to purchase, at the adjusted Exercise Price, that number of Preferred
Shares (calculated to the nearest one hundred-thousandth of a share) obtained by

                                      -18-
<PAGE>   22

(i) multiplying (x) the number of Preferred Shares covered by a Right
immediately prior to this adjustment, by (y) the Exercise Price in effect
immediately prior to such adjustment of the Exercise Price, and (ii) dividing
the product so obtained by the Exercise Price in effect immediately after such
adjustment of the Exercise Price.

                (h) The Company may elect on or after the date of any adjustment
of the Exercise Price as a result of the calculations made in Section 11(b) or
(c) to adjust the number of Rights, in substitution for any adjustment in the
number of Preferred Shares purchasable upon the exercise of a Right. Each of the
Rights outstanding after such adjustment of the number of Rights shall be
exercisable for the number of one-thousandths of a Preferred Share for which a
Right was exercisable immediately prior to such adjustment. Each Right held of
record prior to such adjustment of the number of Rights shall become that number
of Rights (calculated to the nearest one hundred-thousandth) obtained by
dividing the Exercise Price in effect immediately prior to adjustment of the
Exercise Price by the Exercise Price in effect immediately after adjustment of
the Exercise Price. The Company shall make a public announcement of its election
to adjust the number of Rights, indicating the record date for the adjustment,
and, if known at the time, the amount of the adjustment to be made. This record
date may be the date on which the Exercise Price is adjusted or any day
thereafter, but, if any Rights Certificates have been issued, shall be at least
ten (10) days later than the date of the public announcement. If Rights
Certificates have been issued, upon each adjustment of the number of Rights
pursuant to this Section 11(h), the Company shall, as promptly as practicable,
cause to be distributed to holders of record of Rights Certificates on such
record date Rights Certificates evidencing, subject to Section 14 hereof, the
additional Rights to which such holders shall be entitled as a result of such
adjustment, or, at the option of the Company, shall cause to be distributed to
such holders of record in substitution and replacement for the Rights
Certificates held by such holders prior to the date of adjustment, and upon
surrender thereof, if required by the Company, new Rights Certificates
evidencing all the Rights to which such holders shall be entitled after such
adjustment. Rights Certificates so to be distributed shall be issued, executed
and countersigned in the manner provided for herein (and may bear, at the option
of the Company, the adjusted Exercise Price) and shall be registered in the
names of the holders of record of Rights Certificates on the record date
specified in the public announcement.

                (i) Irrespective of any adjustment or change in the Exercise
Price or the number of Preferred Shares issuable upon the exercise of the
Rights, the Rights Certificates theretofore and thereafter issued may continue
to express the Exercise Price per one one-thousandth of a Preferred Share and
the number of one-thousandths of a Preferred Share which were expressed in the
initial Rights Certificates issued hereunder.

                (j) Before taking any action that would cause an adjustment
reducing the Exercise Price below the par or stated value, if any, of the number
of one-thousandths of a Preferred Share issuable upon exercise of the Rights,
the Company shall take any corporate action which may, in the opinion of its
counsel, be necessary in order that the Company may validly and legally issue as
fully paid and nonassessable shares such number of one-thousandths of a
Preferred Share at such adjusted Exercise Price.

                                      -19-
<PAGE>   23

                (k) In any case in which this Section 11 shall require that an
adjustment in the Exercise Price be made effective as of a record date for a
specified event, the Company may elect to defer until the occurrence of such
event the issuing to the holder of any Right exercised after such record date of
the number of one-thousandths of a Preferred Share and other capital stock or
securities of the Company, if any, issuable upon such exercise over and above
the number of one-thousandths of a Preferred Share and other capital stock or
securities of the Company, if any, issuable upon such exercise on the basis of
the Exercise Price in effect prior to such adjustment; provided, however, that
the Company shall deliver to such holder a due bill or other appropriate
instrument evidencing such holder's right to receive such additional shares
(fractional or otherwise) upon the occurrence of the event requiring such
adjustment.

                (l) Anything in this Section 11 to the contrary notwithstanding,
prior to the Distribution Date, the Company shall be entitled to make such
reductions in the Exercise Price, in addition to those adjustments expressly
required by this Section 11, as and to the extent that it in its sole discretion
shall determine to be advisable in order that any (i) consolidation or
subdivision of the Preferred or Common Shares, (ii) issuance wholly for cash of
any Preferred or Common Shares at less than the current market price, (iii)
issuance wholly for cash of Preferred or Common Shares or securities which by
their terms are convertible into or exchangeable for Preferred or Common Shares,
(iv) stock dividends or (v) issuance of rights, options or warrants referred to
in this Section 11, hereafter made by the Company to holders of its Preferred or
Common Shares shall not be taxable to such stockholders.

                (m) The Company covenants and agrees that, after the
Distribution Date, it will not, except as permitted by Sections 23, 24 or 27
hereof, take (or permit to be taken) any action if at the time such action is
taken it is reasonably foreseeable that such action will diminish substantially
or otherwise eliminate the benefits intended to be afforded by the Rights.

                (n) In the event that the Company shall at any time after the
date of this Agreement (A) declare a dividend on the Common Shares payable in
Common Shares, (B) subdivide the outstanding Common Shares, (C) combine the
outstanding Common Shares (by reverse stock split or otherwise) into a smaller
number of Common Shares, or (D) issue any shares of its capital stock in a
reclassification of the Common Shares (including any such reclassification in
connection with a consolidation or merger in which the Company is the continuing
or surviving corporation), then, in each such event, except as otherwise
provided in this Section 11(a) and Section 7(e) hereof: (1) each Common Share
(or shares of capital stock issued in such reclassification of the Common
Shares) outstanding immediately following such time shall have associated with
it the number of Rights as were associated with one Common Share immediately
prior to the occurrence of the event described in clauses (A)-(D) above; (2) the
Exercise Price in effect at the time of the record date for such dividend or of
the effective date of such subdivision, combination or reclassification shall be
adjusted so that the Exercise Price thereafter shall equal the result obtained
by multiplying the Exercise Price in effect immediately prior to such time by a
fraction, the numerator of which shall be the total number of Common Shares
outstanding immediately prior to the event described in clauses (A)-(D) above,
and the denominator of which shall be the total number of Common Shares
outstanding immediately after such event; provided,

                                      -20-
<PAGE>   24

however, that in no event shall the consideration to be paid upon the exercise
of one Right be less than the aggregate par value of the shares of capital stock
of the Company issuable upon exercise of such Right; and (3) the number of
one-thousandths of a Preferred Share (or shares of such other capital stock)
issuable upon the exercise of each Right outstanding after such event shall
equal the number of one-thousandths of a Preferred Share (or shares of such
other capital stock) as were issuable with respect to one Right immediately
prior to such event. Each Common Share that shall become outstanding after an
adjustment has been made pursuant to this Section 11(n) shall have associated
with it the number of Rights, exercisable at the Exercise Price and for the
number of one-thousandths of a Preferred Share (or shares of such other capital
stock) as one Common Share has associated with it immediately following the
adjustment made pursuant to this Section 11(n). If an event occurs which would
require an adjustment under both this Section 11(n) and Section 11(a)(ii)
hereof, the adjustment provided for in this Section 11(n) shall be in addition
to, and shall be made prior to, any adjustment required pursuant to Section
11(a)(ii) hereof.

        Section 12. Certificate of Adjusted Exercise Price or Number of Shares.
Whenever an adjustment is made as provided in Sections 11 and 13 hereof, the
Company shall promptly (a) prepare a certificate setting forth such adjustment
and a brief statement of the facts accounting for such adjustment, (b) file with
the Rights Agent and with each transfer agent for the Preferred Shares a copy of
such certificate and (c) mail a brief summary thereof to each holder of a Rights
Certificate in accordance with Section 26 hereof. Notwithstanding the foregoing
sentence, the failure of the Company to make such certification or give such
notice shall not affect the validity of such adjustment or the force or effect
of the requirement for such adjustment. The Rights Agent shall be fully
protected in relying on any such certificate and on any adjustment contained
therein and shall not be deemed to have knowledge of such adjustment unless and
until it shall have received such certificate.

        Section 13. Consolidation, Merger or Sale or Transfer of Assets or
Earning Power.

                (a) In the event that, following a Triggering Event, directly or
indirectly:

                        (i) the Company shall consolidate with, or merge with
and into, any other Person (other than a wholly-owned Subsidiary of the Company
in a transaction the principal purpose of which is to change the state of
incorporation of the Company and which complies with Section 11(m) hereof);

                        (ii) any Person shall consolidate with the Company, or
merge with and into the Company and the Company shall be the continuing or
surviving corporation of such consolidation or merger and, in connection with
such merger, all or part of the Common Shares shall be changed into or exchanged
for stock or other securities of any other person (or the Company); or

                        (iii) the Company shall sell or otherwise transfer (or
one or more of its Subsidiaries shall sell or otherwise transfer), in one or
more transactions, assets or earning power aggregating 50% or more of the assets
or earning power of the Company and its Subsidiaries (taken as a whole) to any
other Person or Persons (other than the Company or one or more of its wholly

                                      -21-
<PAGE>   25

owned Subsidiaries in one or more transactions, each of which individually (and
together) complies with Section 11(m) hereof),

                  then, concurrent with and in each such case,

                        (A) each holder of a Right (except as provided in
Section 7(e) hereof) shall thereafter have the right to receive, upon the
exercise thereof at a price equal to the Total Exercise Price applicable
immediately prior to the occurrence of the Section 13 Event in accordance with
the terms of this Agreement, such number of validly authorized and issued, fully
paid, nonassessable and freely tradeable Common Shares of the Principal Party
(as hereinafter defined), free of any liens, encumbrances, rights of first
refusal or other adverse claims, as shall be equal to the result obtained by
dividing such Total Exercise Price by an amount equal to fifty percent (50%) of
the Current Per Share Market Price of the Common Shares of such Principal Party
on the date of consummation of such Section 13 Event, provided, however, that
the Exercise Price and the number of Common Shares of such Principal Party so
receivable upon exercise of a Right shall be subject to further adjustment as
appropriate in accordance with Section 11(e) hereof;

                        (B) such Principal Party shall thereafter be liable for,
and shall assume, by virtue of such Section 13 Event, all the obligations and
duties of the Company pursuant to this Agreement;

                        (C) the term "Company" shall thereafter be deemed to
refer to such Principal Party, it being specifically intended that the
provisions of Section 11 hereof shall apply only to such Principal Party
following the first occurrence of a Section 13 Event;

                        (D) such Principal Party shall take such steps
(including, but not limited to, the reservation of a sufficient number of its
Common Shares) in connection with the consummation of any such transaction as
may be necessary to ensure that the provisions hereof shall thereafter be
applicable, as nearly as reasonably may be, in relation to its Common Shares
thereafter deliverable upon the exercise of the Rights; and

                        (E) upon the subsequent occurrence of any consolidation,
merger, sale or transfer of assets or other extraordinary transaction in respect
of such Principal Party, each holder of a Right shall thereupon be entitled to
receive, upon exercise of a Right and payment of the Total Exercise Price as
provided in this Section 13(a), such cash, shares, rights, warrants and other
property which such holder would have been entitled to receive had such holder,
at the time of such transaction, owned the Common Shares of the Principal Party
receivable upon the exercise of such Right pursuant to this Section 13(a), and
such Principal Party shall take such steps (including, but not limited to,
reservation of shares of stock) as may be necessary to permit the subsequent
exercise of the Rights in accordance with the terms hereof for such cash,
shares, rights, warrants and other property.

                        (F) For purposes hereof, the "earning power" of the
Company and its Subsidiaries shall be determined in good faith by the Company's
Board of Directors on the basis of the operating income of each business
operated by the Company and its Subsidiaries during the

                                      -22-
<PAGE>   26

three fiscal years preceding the date of such determination (or, in the case of
any business not operated by the Company or any Subsidiary during three full
fiscal years preceding such date, during the period such business was operated
by the Company or any Subsidiary).

                (b) For purposes of this Agreement, the term "PRINCIPAL PARTY"
shall mean:

                        (i) in the case of any transaction described in clause
(i) or (ii) of Section 13(a) hereof: (A) the Person that is the issuer of the
securities into which the Common Shares are converted in such merger or
consolidation, or, if there is more than one such issuer, the issuer the Common
Shares of which have the greatest aggregate market value of shares outstanding,
or (B) if no securities are so issued, (x) the Person that is the other party to
the merger, if such Person survives said merger, or, if there is more than one
such Person, the Person the Common Shares of which have the greatest aggregate
market value of shares outstanding or (y) if the Person that is the other party
to the merger does not survive the merger, the Person that does survive the
merger (including the Company if it survives) or (z) the Person resulting from
the consolidation; and

                        (ii) in the case of any transaction described in clause
(iii) of Section 13(a) hereof, the Person that is the party receiving the
greatest portion of the assets or earning power transferred pursuant to such
transaction or transactions, or, if more than one Person that is a party to such
transaction or transactions receives the same portion of the assets or earning
power so transferred and each such portion would, were it not for the other
equal portions, constitute the greatest portion of the assets or earning power
so transferred, or if the Person receiving the greatest portion of the assets or
earning power cannot be determined, whichever of such Persons is the issuer of
Common Shares having the greatest aggregate market value of shares outstanding;
provided, however, that in any such case described in the foregoing clause
(b)(i) or (b)(ii), if the Common Shares of such Person are not at such time or
have not been continuously over the preceding 12-month period registered under
Section 12 of the Exchange Act, then (1) if such Person is a direct or indirect
Subsidiary of another Person the Common Shares of which are and have been so
registered, the term "Principal Party" shall refer to such other Person, or (2)
if such Person is a Subsidiary, directly or indirectly, of more than one Person,
the Common Shares of which are and have been so registered, the term "Principal
Party" shall refer to whichever of such Persons is the issuer of Common Shares
having the greatest aggregate market value of shares outstanding, or (3) if such
Person is owned, directly or indirectly, by a joint venture formed by two or
more Persons that are not owned, directly or indirectly by the same Person, the
rules set forth in clauses (1) and (2) above shall apply to each of the owners
having an interest in the venture as if the Person owned by the joint venture
was a Subsidiary of both or all of such joint venturers, and the Principal Party
in each such case shall bear the obligations set forth in this Section 13 in the
same ration as its interest in such Person bears to the total of such interests.

                (c) The Company shall not consummate any Section 13 Event unless
the Principal Party shall have a sufficient number of authorized Common Shares
that have not been issued or reserved for issuance to permit the exercise in
full of the Rights in accordance with this Section 13 and unless prior thereto
the Company and such issuer shall have executed and delivered to the Rights
Agent a supplemental agreement confirming that such Principal Party shall, upon

                                      -23-
<PAGE>   27

consummation of such Section 13 Event, assume this Agreement in accordance with
Sections 13(a) and 13(b) hereof, that all rights of first refusal or preemptive
rights in respect of the issuance of Common Shares of such Principal Party upon
exercise of outstanding Rights have been waived, that there are no rights,
warrants, instruments or securities outstanding or any agreements or
arrangements which, as a result of the consummation of such transaction, would
eliminate or substantially diminish the benefits intended to be afforded by the
Rights and that such transaction shall not result in a default by such Principal
Party under this Agreement, and further providing that, as soon as practicable
after the date of such Section 13 Event, such Principal Party will:

                        (i) prepare and file a registration statement under the
Securities Act with respect to the Rights and the securities purchasable upon
exercise of the Rights on an appropriate form, use its best efforts to cause
such registration statement to become effective as soon as practicable after
such filing and use its best efforts to cause such registration statement to
remain effective (with a prospectus at all times meeting the requirements of the
Securities Act) until the Expiration Date, and similarly comply with applicable
state securities laws;

                        (ii) use its best efforts to list (or continue the
listing of) the Rights and the securities purchasable upon exercise of the
Rights on a national securities exchange or to meet the eligibility requirements
for quotation on Nasdaq and list (or continue the listing of) the Rights and the
securities purchasable upon exercise of the Rights on Nasdaq; and

                        (iii) deliver to holders of the Rights historical
financial statements for such Principal Party which comply in all respects with
the requirements for registration on Form 10 (or any successor form) under the
Exchange Act.

        In the event that at any time after the occurrence of a Triggering Event
some or all of the Rights shall not have been exercised at the time of a
transaction described in this Section 13, the Rights which have not theretofore
been exercised shall thereafter be exercisable in the manner described in
Section 13(a) (without taking into account any prior adjustment required by
Section 11(a)(ii)).

                (d) In case the "Principal Party" for purposes of Section 13(b)
hereof has provision in any of its authorized securities or in its certificate
of incorporation or by-laws or other instrument governing its corporate affairs,
which provision would have the effect of (i) causing such Principal Party to
issue (other than to holders of Rights pursuant to Section 13 hereof), in
connection with, or as a consequence of, the consummation of a Section 13 Event,
Common Shares or Equivalent Shares of such Principal Party at less than the then
Current Per Share Market Price thereof or securities exercisable for, or
convertible into, Common Shares or Equivalent Shares of such Principal Party at
less than such then Current Per Share Market Price, or (ii) providing for any
special payment, tax or similar provision in connection with the issuance of the
Common Shares of such Principal Party pursuant to the provisions of Section 13
hereof, then, in such event, the Company hereby agrees with each holder of
Rights that it shall not consummate any such transaction unless prior thereto
the Company and such Principal Party shall have executed and delivered to the
Rights Agent a supplemental agreement providing that the provision in question
of such Principal Party shall have been canceled, waived or amended, or that the
authorized securities shall be

                                      -24-
<PAGE>   28

redeemed, so that the applicable provision will have no effect in connection
with or as a consequence of, the consummation of the proposed transaction.

                (e) The Company covenants and agrees that it shall not, at any
time after the Distribution Date, effect or permit to occur any Section 13
Event, if (i) at the time or immediately after such Section 13 Event there are
any rights, warrants or other instruments or securities outstanding or
agreements in effect which would substantially diminish or otherwise eliminate
the benefits intended to be afforded by the Rights, (ii) prior to,
simultaneously with or immediately after such Section 13 Event, the stockholders
of the Person who constitutes, or would constitute, the "Principal Party" for
purposes of Section 13(b) hereof shall have received a distribution of Rights
previously owned by such Person or any of its Affiliates or Associates or (iii)
the form or nature of organization of the Principal Party would preclude or
limit the exercisability of the Rights.

                (f) The provisions of this Section 13 shall similarly apply to
successive mergers or consolidations or sales or other transfers.

        Section 14. Fractional Rights and Fractional Shares.

                (a) The Company shall not be required to issue fractions of
Rights or to distribute Rights Certificates which evidence fractional Rights. In
lieu of such fractional Rights, there shall be paid to the registered holders of
the Rights Certificates with regard to which such fractional Rights would
otherwise be issuable, an amount in cash equal to the same fraction of the
current market value of a whole Right. For the purposes of this Section 14(a),
the current market value of a whole Right shall be the closing price of the
Rights for the Trading Day immediately prior to the date on which such
fractional Rights would have been otherwise issuable, as determined pursuant to
the second sentence of Section 1(j) hereof.

                (b) The Company shall not be required to issue fractions of
Preferred Shares (other than fractions that are integral multiples of one
one-thousandth of a Preferred Share) upon exercise of the Rights or to
distribute certificates which evidence fractional Preferred Shares (other than
fractions that are integral multiples of one one-thousandth of a Preferred
Share). Interests in fractions of Preferred Shares in integral multiples of one
one-thousandth of a Preferred Share may, at the election of the Company, be
evidenced by depositary receipts, pursuant to an appropriate agreement between
the Company and a depositary selected by it; provided, that such agreement shall
provide that the holders of such depositary receipts shall have all the rights,
privileges and preferences to which they are entitled as beneficial owners of
the Preferred Shares represented by such depositary receipts. In lieu of
fractional Preferred Shares that are not integral multiples of one
one-thousandth of a Preferred Share, the Company shall pay to the registered
holders of Rights Certificates at the time such Rights are exercised as herein
provided an amount in cash equal to the same fraction of the current market
value of a Preferred Share. For purposes of this Section 14(b), the current
market value of a Preferred Share shall be the product equal to (x) one
thousandth multiplied by (y) the closing price of a Common Share (as determined
pursuant to the second sentence of Section 1(j) hereof) for the Trading Day
immediately prior to the date of such exercise.

                                      -25-
<PAGE>   29

                (c) The Company shall not be required to issue fractions of
Common Shares or to distribute certificates which evidence fractional Common
Shares upon the exercise or exchange of Rights. In lieu of such fractional
Common Shares, the Company shall pay to the registered holders of Rights
Certificates at the time such Rights are exercised as herein provided an amount
in cash equal to the same fraction of the current market value of a Common
Share. For purposes of this Section 14(c), the current market value of a Common
Share shall be the closing price of a Common Share (as determined pursuant to
the second sentence of Section 1(j) hereof) for the Trading Day immediately
prior to the date of such exercise.

                (d) The holder of a Right by the acceptance of the Right
expressly waives his or her right to receive any fractional Rights or any
fractional shares (other than fractions that are integral multiples of one
one-thousandth of a Preferred Share) upon exercise of a Right.

        Section 15. Rights of Action. All rights of action in respect of this
Agreement, excepting the rights of action given to the Rights Agent pursuant to
Section 18 hereof, are vested in the respective registered holders of the Rights
Certificates (and, prior to the Distribution Date, the registered holders of the
Common Shares); and any registered holder of any Rights Certificate (or, prior
to the Distribution Date, of the Common Shares), without the consent of the
Rights Agent or of the holder of any other Rights Certificate (or, prior to the
Distribution Date, of the Common Shares), may, in his or her own behalf and for
his or her own benefit, enforce, and may institute and maintain any suit, action
or proceeding against the Company to enforce, or otherwise act in respect of,
his or her right to exercise the Rights evidenced by such Rights Certificate in
the manner provided in such Rights Certificate and in this Agreement. Without
limiting the foregoing or any remedies available to the holders of Rights, it is
specifically acknowledged that the holders of Rights would not have an adequate
remedy at law for any breach of this Agreement and will be entitled to specific
performance of the obligations under, and injunctive relief against actual or
threatened violations of, the obligations of any Person subject to this
Agreement.

        Section 16. Agreement of Rights Holders. Every holder of a Right, by
accepting the same, consents and agrees with the Company and the Rights Agent
and with every other holder of a Right that:

                (a) prior to the Distribution Date, the Rights will be
transferable only in connection with the transfer of the Common Shares;

                (b) after the Distribution Date, the Rights Certificates are
transferable only on the registry books of the Rights Agent if surrendered at
the principal office or offices of the Rights Agent designated for such
purposes, duly endorsed or accompanied by a proper instrument of transfer and
with the appropriate forms and certificates fully executed; and

                (c) subject to Sections 6(a) and 7(f) hereof, the Company and
the Rights Agent may deem and treat the person in whose name the Rights
Certificate (or, prior to the Distribution Date, the associated Common Shares
certificate) is registered as the absolute owner thereof and of the Rights
evidenced thereby (notwithstanding any notations of ownership or writing on the
Rights Certificates or the associated Common Shares certificate made by anyone
other than the Company or

                                      -26-
<PAGE>   30

the Rights Agent) for all purposes whatsoever, and neither the Company nor the
Rights Agent shall be affected by any notice to the contrary.

        Section 17. Rights Certificate Holder Not Deemed a Stockholder. No
holder, as such, of any Rights Certificate shall be entitled to vote, receive
dividends or be deemed for any purpose to be the holder of the Preferred Shares
or any other securities of the Company which may at any time be issuable on the
exercise of the Rights represented thereby, nor shall anything contained herein
or in any Rights Certificate be construed to confer upon the holder of any
Rights Certificate, as such, any of the rights of a stockholder of the Company
or any right to vote for the election of directors or upon any matter submitted
to stockholders at any meeting thereof, or to give or withhold consent to any
corporate action, or to receive notice of meetings or other actions affecting
stockholders (except as specifically provided in Section 25 hereof), or to
receive dividends or subscription rights, or otherwise, until the Right or
Rights evidenced by such Rights Certificate shall have been exercised in
accordance with the provisions hereof.

        Section 18. Concerning the Rights Agent.

                (a) The Company agrees to pay to the Rights Agent reasonable
compensation for all services rendered by it hereunder and, from time to time,
on demand of the Rights Agent, its reasonable expenses and counsel fees and
other disbursements incurred in the administration and execution of this
Agreement and the exercise and performance of its duties hereunder. The Company
also agrees to indemnify the Rights Agent for, and to hold it harmless against,
any loss, liability or expense, incurred without gross negligence, bad faith or
willful misconduct on the part of the Rights Agent, for anything done or omitted
by the Rights Agent in connection with the acceptance and administration of this
Agreement, including the costs and expenses of defending against any claim of
liability in the premises. In no event will the Rights Agent be liable for
special, indirect, incidental or consequential loss or damage of any kind
whatsoever, even if the Rights Agent has been advised of the possibility of such
loss or damage.

                (b) The Rights Agent shall be protected and shall incur no
liability for, or in respect of any action taken, suffered or omitted by it in
connection with, its administration of this Agreement in reliance upon any
Rights Certificate or certificate for the Preferred Shares or Common Shares or
for other securities of the Company, instrument of assignment or transfer, power
of attorney, endorsement, affidavit, letter, notice, direction, consent,
certificate, statement or other paper or document reasonably believed by it to
be genuine and to be signed, executed and, where necessary, verified or
acknowledged, by the proper Person or Persons, or otherwise upon the advice of
counsel as set forth in Section 20 hereof.

        Section 19. Merger or Consolidation or Change of Name of Rights Agent.

                (a) Any corporation into which the Rights Agent or any successor
Rights Agent may be merged or with which it may be consolidated, or any
corporation resulting from any merger or consolidation to which the Rights Agent
or any successor Rights Agent shall be a party, or any corporation succeeding to
the corporate trust business of the Rights Agent or any successor Rights Agent,
shall be the successor to the Rights Agent under this Agreement without the
execution or

                                      -27-
<PAGE>   31

filing of any paper or any further act on the part of any of the parties hereto;
provided, however, that such corporation would be eligible for appointment as a
successor Rights Agent under the provisions of Section 21 hereof. In case at the
time such successor Rights Agent shall succeed to the agency created by this
Agreement, any of the Rights Certificates shall have been countersigned but not
delivered, any such successor Rights Agent may adopt the countersignature of the
predecessor Rights Agent and deliver such Rights Certificates so countersigned;
and in case at that time any of the Rights Certificates shall not have been
countersigned, any successor Rights Agent may countersign such Rights
Certificates either in the name of the predecessor Rights Agent or in the name
of the successor Rights Agent; and in all such cases such Rights Certificates
shall have the full force provided in the Rights Certificates and in this
Agreement.

                (b) In case at any time the name of the Rights Agent shall be
changed and at such time any of the Rights Certificates shall have been
countersigned but not delivered, the Rights Agent may adopt the countersignature
under its prior name and deliver Rights Certificates so countersigned; and in
case at that time any of the Rights Certificates shall not have been
countersigned, the Rights Agent may countersign such Rights Certificates either
in its prior name or in its changed name; and in all such cases such Rights
Certificates shall have the full force provided in the Rights Certificates and
in this Agreement.

        Section 20. Duties of Rights Agent. The Rights Agent undertakes the
duties and obligations imposed by this Agreement upon the following terms and
conditions, by all of which the Company and the holders of Rights Certificates,
by their acceptance thereof, shall be bound:

                (a) The Rights Agent may consult with legal counsel (who may be
legal counsel for the Company), and the opinion of such counsel shall be full
and complete authorization and protection to the Rights Agent as to any action
taken or omitted by it in good faith and in accordance with such opinion.

                (b) Whenever in the performance of its duties under this
Agreement the Rights Agent shall deem it necessary or desirable that any fact or
matter (including, without limitation, the identity of any Acquiring Person and
the determination of Current Per Share Market Price) be proved or established by
the Company prior to taking or suffering any action hereunder, such fact or
matter (unless other evidence in respect thereof be herein specifically
prescribed) may be deemed to be conclusively proved and established by a
certificate signed by any one of the Chairman of the Board, the Chief Executive
Officer, the President, any Vice President, the Chief Financial Officer, the
Secretary or any Assistant Secretary of the Company and delivered to the Rights
Agent; and such certificate shall be full authorization to the Rights Agent for
any action taken or suffered in good faith by it under the provisions of this
Agreement in reliance upon such certificate.

                (c) The Rights Agent shall be liable hereunder to the Company
and any other Person only for its own gross negligence, bad faith or willful
misconduct.

                (d) The Rights Agent shall not be liable for or by reason of any
of the statements of fact or recitals contained in this Agreement or in the
Rights Certificates (except its

                                      -28-
<PAGE>   32

countersignature thereof) or be required to verify the same, but all such
statements and recitals are and shall be deemed to have been made by the Company
only.

                (e) The Rights Agent shall not be under any responsibility in
respect of the validity of this Agreement or the execution and delivery hereof
(except the due execution hereof by the Rights Agent) or in respect of the
validity or execution of any Rights Certificate (except its countersignature
thereof); nor shall it be responsible for any breach by the Company of any
covenant or condition contained in this Agreement or in any Rights Certificate;
nor shall it be responsible for any change in the exercisability of the Rights
or any adjustment in the terms of the Rights (including the manner, method or
amount thereof) provided for in Sections 3, 11, 13, 23 or 24, or the
ascertaining of the existence of facts that would require any such change or
adjustment (except with respect to the exercise of Rights evidenced by Rights
Certificates after receipt by the Rights Agent of a certificate furnished
pursuant to Section 12 describing such change or adjustment); nor shall it by
any act hereunder be deemed to make any representation or warranty as to the
authorization or reservation of any Preferred Shares to be issued pursuant to
this Agreement or any Rights Certificate or as to whether any Preferred Shares
will, when issued, be validly authorized and issued, fully paid and
nonassessable.

                (f) The Company agrees that it will perform, execute,
acknowledge and deliver or cause to be performed, executed, acknowledged and
delivered all such further and other acts, instruments and assurances as may
reasonably be required by the Rights Agent for the carrying out or performing by
the Rights Agent of the provisions of this Agreement.

                (g) The Rights Agent is hereby authorized and directed to accept
instructions with respect to the performance of its duties hereunder from any
one of the Chairman of the Board, the Chief Executive Officer, the President,
any Vice President, the Chief Financial Officer, the Secretary or any Assistant
Secretary of the Company, and to apply to such officers for advice or
instructions in connection with its duties, and it shall not be liable for any
action taken or suffered by it in good faith in accordance with instructions of
any such officer or for any delay in acting while waiting for those
instructions. Any application by the Rights Agent for written instructions from
the Company may, at the option of the Rights Agent, set forth in writing any
action proposed to be taken or omitted by the Rights Agent under this Rights
Agreement and the date on and/or after which such action shall be taken or such
omission shall be effective. The Rights Agent shall not be liable for any action
taken by, or omission of, the Rights Agent in accordance with a proposal
included in any such application on or after the date specified in such
application (which date shall not be less than five (5) Business Days after the
date on which any officer of the Company actually receives such application,
unless any such officer shall have consented in writing to an earlier date)
unless, prior to taking any such action (or the effective date in the case of an
omission), the Rights Agent shall have received written instructions in response
to such application specifying the action to be taken or omitted.

                (h) The Rights Agent and any stockholder, director, officer or
employee of the Rights Agent may buy, sell or deal in any of the Rights or other
securities of the Company or become pecuniarily interested in any transaction in
which the Company may be interested, or

                                      -29-
<PAGE>   33

contract with or lend money to the Company or otherwise act as fully and freely
as though it were not Rights Agent under this Agreement. Nothing herein shall
preclude the Rights Agent from acting in any other capacity for the Company or
for any other legal entity.

                (i) The Rights Agent may execute and exercise any of the rights
or powers hereby vested in it or perform any duty hereunder either itself or by
or through its attorneys or agents, and the Rights Agent shall not be answerable
or accountable for any act, default, neglect or misconduct of any such attorneys
or agents or for any loss to the Company resulting from any such act, default,
neglect or misconduct, provided reasonable care was exercised in the selection
and continued employment thereof.

                (j) No provision of this Agreement shall require the Rights
Agent to expend or risk its own funds or otherwise incur any financial liability
in the performance of any of its duties hereunder or in the exercise of its
rights if there shall be reasonable grounds for believing that repayment of such
funds or adequate indemnification against such risk or liability is not
reasonably assured to it.

                (k) If, with respect to any Rights Certificate surrendered to
the Rights Agent for exercise or transfer, the certificate attached to the form
of assignment or form of election to purchase, as the case may be, has either
not been completed or indicates an affirmative response to clause 1 and/or 2
thereof, the Rights Agent shall not take any further action with respect to such
requested exercise or transfer without first consulting with the Company.

        Section 21. Change of Rights Agent. The Rights Agent or any successor
Rights Agent may resign and be discharged from its duties under this Agreement
upon thirty (30) days' notice in writing mailed to the Company and to each
transfer agent of the Preferred Shares and the Common Shares by registered or
certified mail, and to the holders of the Rights Certificates by first-class
mail. The Company may remove the Rights Agent or any successor Rights Agent upon
thirty (30) days' notice in writing, mailed to the Rights Agent or successor
Rights Agent, as the case may be, and to each transfer agent of the Preferred
Shares and the Common Shares by registered or certified mail, and to the holders
of the Rights Certificates by first-class mail. If the Rights Agent shall resign
or be removed or shall otherwise become incapable of acting, the Company shall
appoint a successor to the Rights Agent. If the Company shall fail to make such
appointment within a period of thirty (30) days after giving notice of such
removal or after it has been notified in writing of such resignation or
incapacity by the resigning or incapacitated Rights Agent or by the holder of a
Rights Certificate (who shall, with such notice, submit his or her Rights
Certificate for inspection by the Company), then the registered holder of any
Rights Certificate may apply to any court of competent jurisdiction for the
appointment of a new Rights Agent. Any successor Rights Agent, whether appointed
by the Company or by such a court, shall be a corporation organized and doing
business under the laws of the United States or of any state of the United
States, in good standing, which is authorized under such laws to exercise
corporate trust or stockholder services powers and is subject to supervision or
examination by federal or state authority and which has at the time of its
appointment as Rights Agent a combined capital and surplus of at least $100
million. After appointment, the successor Rights Agent shall be vested with the
same powers, rights, duties and responsibilities as if it had

                                      -30-
<PAGE>   34

been originally named as Rights Agent without further act or deed; but the
predecessor Rights Agent shall deliver and transfer to the successor Rights
Agent any property at the time held by it hereunder, and execute and deliver any
further assurance, conveyance, act or deed necessary for the purpose. Not later
than the effective date of any such appointment, the Company shall file notice
thereof in writing with the predecessor Rights Agent and each transfer agent of
the Preferred Shares and the Common Shares, and mail a notice thereof in writing
to the registered holders of the Rights Certificates. Failure to give any notice
provided for in this Section 21, however, or any defect therein, shall not
affect the legality or validity of the resignation or removal of the Rights
Agent or the appointment of the successor Rights Agent, as the case may be.

        Section 22. Issuance of New Rights Certificates. Notwithstanding any of
the provisions of this Agreement or of the Rights to the contrary, the Company
may, at its option, issue new Rights Certificates evidencing Rights in such form
as may be approved by its Board of Directors to reflect any adjustment or change
in the Exercise Price and the number or kind or class of shares or other
securities or property purchasable under the Rights Certificates made in
accordance with the provisions of this Agreement. In addition, in connection
with the issuance or sale of Common Shares following the Distribution Date and
prior to the redemption or expiration of the Rights, the Company (a) shall, with
respect to Common Shares so issued or sold pursuant to the exercise of stock
options or under any employee plan or arrangement or upon the exercise,
conversion or exchange of other securities of the Company outstanding at the
date hereof or upon the exercise, conversion or exchange of securities
hereinafter issued by the Company and (b) may, in any other case, if deemed
necessary or appropriate by the Board of Directors of the Company, issue Rights
Certificates representing the appropriate number of Rights in connection with
such issuance or sale; provided, however, that (i) no such Rights Certificate
shall be issued and this sentence shall be null and void ab initio if, and to
the extent that, such issuance or this sentence would create a significant risk
of or result in material adverse tax consequences to the Company or the Person
to whom such Rights Certificate would be issued or would create a significant
risk of or result in such options' or employee plans' or arrangements' failing
to qualify for otherwise available special tax treatment and (ii) no such Rights
Certificate shall be issued if, and to the extent that, appropriate adjustment
shall otherwise have been made in lieu of the issuance thereof.

        Section 23. Redemption.

                (a) The Company may, at its option and with the approval of the
Board of Directors, at any time prior to the Close of Business on the earlier of
(i) the fifth day following the Shares Acquisition Date (or such later date as
may be determined by action of the Company's Board of Directors and publicly
announced by the Company) and (ii) the Final Expiration Date, redeem all but not
less than all the then outstanding Rights at a redemption price of $0.001 per
Right, appropriately adjusted to reflect any stock split, stock dividend or
similar transaction occurring after the date hereof (such redemption price being
herein referred to as the "REDEMPTION PRICE") and the Company may, at its
option, pay the Redemption Price either in Common Shares (based on the Current
Per Share Market Price thereof at the time of redemption) or cash. Such
redemption of the Rights by the Company may be made effective at such time, on
such basis and with such conditions

                                      -31-
<PAGE>   35

as the Board of Directors in its sole discretion may establish. The date on
which the Board of Directors elects to make the redemption effective shall be
referred to as the "REDEMPTION DATE."

                (b) Immediately upon the action of the Board of Directors of the
Company ordering the redemption of the Rights, evidence of which shall have been
filed with the Rights Agent, and without any further action and without any
notice, the right to exercise the Rights will terminate and the only right
thereafter of the holders of Rights shall be to receive the Redemption Price.
The Company shall promptly give public notice of any such redemption; provided,
however, that the failure to give, or any defect in, any such notice shall not
affect the validity of such redemption. Within ten (10) days after the action of
the Board of Directors ordering the redemption of the Rights, the Company shall
give notice of such redemption to the Rights Agent and the holders of the then
outstanding Rights by mailing such notice to all such holders at their last
addresses as they appear upon the registry books of the Rights Agent or, prior
to the Distribution Date, on the registry books of the transfer agent for the
Common Shares. Any notice which is mailed in the manner herein provided shall be
deemed given, whether or not the holder receives the notice. Each such notice of
redemption will state the method by which the payment of the Redemption Price
will be made. Neither the Company nor any of its Affiliates or Associates may
redeem, acquire or purchase for value any Rights at any time in any manner other
than that specifically set forth in this Section 23 or in Section 24 hereof, and
other than in connection with the purchase of Common Shares prior to the
Distribution Date.

        Section 24. Exchange.

                (a) Subject to applicable laws, rules and regulations, and
subject to subsection 24(c) below, the Company may, at its option, by action of
the Board of Directors, at any time after the occurrence of a Triggering Event,
exchange all or part of the then outstanding and exercisable Rights (which shall
not include Rights that have become void pursuant to the provisions of Section
7(e) hereof) for Common Shares at an exchange ratio of one Common Share per
Right, appropriately adjusted to reflect any stock split, stock dividend or
similar transaction occurring after the date hereof (such exchange ratio being
hereinafter referred to as the "EXCHANGE RATIO"). Notwithstanding the foregoing,
the Board of Directors shall not be empowered to effect such exchange at any
time after any Person (other than the Company, any Subsidiary of the Company,
any employee benefit plan of the Company or any such Subsidiary, or any entity
holding Common Shares for or pursuant to the terms of any such plan), together
with all Affiliates and Associates of such Person, becomes the Beneficial Owner
of 50% or more of the Common Shares then outstanding.

                (b) Immediately upon the action of the Board of Directors
ordering the exchange of any Rights pursuant to subsection 24(a) of this Section
24 and without any further action and without any notice, the right to exercise
such Rights shall terminate and the only right thereafter of a holder of such
Rights shall be to receive that number of Common Shares equal to the number of
such Rights held by such holder multiplied by the Exchange Ratio. The Company
shall give public notice of any such exchange; provided, however, that the
failure to give, or any defect in, such notice shall not affect the validity of
such exchange. The Company shall mail a notice of any such exchange to

                                      -32-
<PAGE>   36

all of the holders of such Rights at their last addresses as they appear upon
the registry books of the Rights Agent. Any notice which is mailed in the manner
herein provided shall be deemed given, whether or not the holder receives the
notice. Each such notice of exchange will state the method by which the exchange
of the Common Shares for Rights will be effected and, in the event of any
partial exchange, the number of Rights which will be exchanged. Any partial
exchange shall be effected pro rata based on the number of Rights (other than
Rights which have become void pursuant to the provisions of Section 7(e) hereof)
held by each holder of Rights.

                (c) In the event that there shall not be sufficient Common
Shares issued but not outstanding or authorized but unissued to permit any
exchange of Rights as contemplated in accordance with Section 24(a), the Company
shall either take such action as may be necessary to authorize additional Common
Shares for issuance upon exchange of the Rights or alternatively, at the option
of a majority of the Board of Directors, with respect to each Right (i) pay cash
in an amount equal to the Current Value (as hereinafter defined), in lieu of
issuing Common Shares in exchange therefor, or (ii) issue debt or equity
securities or a combination thereof, having a value equal to the Current Value,
in lieu of issuing Common Shares in exchange for each such Right, where the
value of such securities shall be determined by a nationally recognized
investment banking firm selected by majority vote of the Board of Directors, or
(iii) deliver any combination of cash, property, Common Shares and/or other
securities having a value equal to the Current Value in exchange for each Right.
For purposes of this Section 24(c) only, the Current Value shall mean the
product of the Current Per Share Market Price of Common Shares on the date of
the occurrence of the event described above in subparagraph (a), multiplied by
the number of Common Shares for which the Right otherwise would be exchangeable
if there were sufficient shares available. To the extent that the Company
determines that some action need be taken pursuant to clauses (i), (ii) or (iii)
of this Section 24(c), the Board of Directors may temporarily suspend the
exercisability of the Rights for a period of up to sixty (60) days following the
date on which the event described in Section 24(a) shall have occurred, in order
to seek any authorization of additional Common Shares and/or to decide the
appropriate form of distribution to be made pursuant to the above provision and
to determine the value thereof. In the event of any such suspension, the Company
shall issue a public announcement stating that the exercisability of the Rights
has been temporarily suspended.

                (d) The Company shall not be required to issue fractions of
Common Shares or to distribute certificates which evidence fractional Common
Shares. In lieu of such fractional Common Shares, there shall be paid to the
registered holders of the Rights Certificates with regard to which such
fractional Common Shares would otherwise be issuable, an amount in cash equal to
the same fraction of the current market value of a whole Common Share (as
determined pursuant to the second sentence of Section 1(j) hereof).

                (e) The Company may, at its option, by majority vote of the
Board of Directors, at any time before any Person has become an Acquiring
Person, exchange all or part of the then outstanding Rights for rights of
substantially equivalent value, as determined reasonably and with good faith by
the Board of Directors based upon the advice of one or more nationally
recognized investment banking firms.

                                      -33-
<PAGE>   37

                (f) Immediately upon the action of the Board of Directors
ordering the exchange of any Rights pursuant to subsection 24(e) of this Section
24 and without any further action and without any notice, the right to exercise
such Rights shall terminate and the only right thereafter of a holder of such
Rights shall be to receive that number of rights in exchange therefor as has
been determined by the Board of Directors in accordance with subsection 24(e)
above. The Company shall give public notice of any such exchange; provided,
however, that the failure to give, or any defect in, such notice shall not
affect the validity of such exchange. The Company shall mail a notice of any
such exchange to all of the holders of such Rights at their last addresses as
they appear upon the registry books of the transfer agent for the Common Shares
of the Company. Any notice which is mailed in the manner herein provided shall
be deemed given, whether or not the holder receives the notice. Each such notice
of exchange will state the method by which the exchange of the Rights will be
effected.

        Section 25. Notice of Certain Events.

                (a) In case the Company shall propose to effect or permit to
occur any Triggering Event or Section 13 Event, the Company shall give notice
thereof to each holder of Rights in accordance with Section 26 hereof at least
twenty (20) days prior to occurrence of such Triggering Event or such Section 13
Event.

                (b) In case any Triggering Event or Section 13 Event shall
occur, then, in any such case, the Company shall as soon as practicable
thereafter give to each holder of a Rights Certificate, in accordance with
Section 26 hereof, a notice of the occurrence of such event, which shall specify
the event and the consequences of the event to holders of Rights under Sections
11(a)(ii) and 13 hereof.

        Section 26. Notices. Notices or demands authorized by this Agreement to
be given or made by the Rights Agent or by the holder of any Rights Certificate
to or on the Company shall be sufficiently given or made if sent by first-class
mail, postage prepaid, addressed (until another address is filed in writing with
the Rights Agent) as follows:

                               DigitalThink, Inc.
                               1098 Harrison Street
                               San Francisco, CA 94103

                                      -34-
<PAGE>   38

                        with a copy to:
                        Wilson Sonsini Goodrich & Rosati
                        Professional Corporation
                        650 Page Mill Road
                        Palo Alto, California 94304-1050

                        Attention: David J. Berger, Esq.

        Subject to the provisions of Section 21 hereof, any notice or demand
authorized by this Agreement to be given or made by the Company or by the holder
of any Rights Certificate to or on the Rights Agent shall be sufficiently given
or made if sent by first-class mail, postage prepaid, addressed (until another
address is filed in writing with the Company) as follows:

                        Wells Fargo & Company
                        161 North Concord Exchange
                        South St. Paul, MN 55075

                        Attention: Karri L. Van Dell

Notices or demands authorized by this Agreement to be given or made by the
Company or the Rights Agent to the holder of any Rights Certificate shall be
sufficiently given or made if sent by first-class mail, postage prepaid,
addressed to such holder at the address of such holder as shown on the registry
books of the Company.

        Section 27. Supplements and Amendments. Prior to the occurrence of a
Distribution Date, the Company may supplement or amend this Agreement in any
respect without the approval of any holders of Rights and the Rights Agent
shall, if the Company so directs, execute such supplement or amendment. From and
after the occurrence of a Distribution Date, the Company and the Rights Agent
may from time to time supplement or amend this Agreement without the approval of
any holders of Rights in order to (i) cure any ambiguity, (ii) correct or
supplement any provision contained herein which may be defective or inconsistent
with any other provisions herein, (iii) shorten or lengthen any time period
hereunder or (iv) to change or supplement the provisions hereunder in any manner
that the Company may deem necessary or desirable and that shall not adversely
affect the interests of the holders of Rights (other than an Acquiring Person or
an Affiliate or Associate of an Acquiring Person); provided, this Agreement may
not be supplemented or amended to lengthen, pursuant to clause (iii) of this
sentence, (A) a time period relating to when the Rights may be redeemed at such
time as the Rights are not then redeemable or (B) any other time period unless
such lengthening is for the purpose of protecting, enhancing or clarifying the
rights of, and/or the benefits to, the holders of Rights (other than an
Acquiring Person or an Affiliate or Associate of an Acquiring Person). Upon the
delivery of a certificate from an appropriate officer of the Company that states
that the proposed supplement or amendment is in compliance with the terms of
this Section 27, the Rights Agent shall execute such supplement or amendment.
Prior to the Distribution Date, the interests of the holders of Rights shall be
deemed coincident with the interests of the holders of Common Shares.

                                      -35-
<PAGE>   39

        Section 28. Successors. All the covenants and provisions of this
Agreement by or for the benefit of the Company or the Rights Agent shall bind
and inure to the benefit of their respective successors and assigns hereunder.

        Section 29. Determinations and Actions by the Board of Directors, etc.
For all purposes of this Agreement, any calculation of the number of Common
Shares outstanding at any particular time, including for purposes of determining
the particular percentage of such outstanding Common Shares of which any Person
is the Beneficial Owner, shall be made in accordance with the last sentence of
Rule 13d-3(d)(1)(i) of the General Rules and Regulations under the Exchange Act.
The Board of Directors of the Company shall have the exclusive power and
authority to administer this Agreement and to exercise all rights and powers
specifically granted to the Board, or the Company, or as may be necessary or
advisable in the administration of this Agreement, including, without
limitation, the right and power (i) to interpret the provisions of this
Agreement and (ii) to make all determinations deemed necessary or advisable for
the administration of this Agreement (including a determination to redeem or not
redeem the Rights or to amend the Agreement). All such actions, calculations,
interpretations and determinations (including, for purposes of clause (y) below,
all omissions with respect to the foregoing) which are done or made by the Board
in good faith, shall (x) be final, conclusive and binding on the Company, the
Rights Agent, the holders of the Rights Certificates and all other parties and
(y) not subject the Board or the Continuing Directors to any liability to the
holders of the Rights.

        Section 30. Benefits of this Agreement. Nothing in this Agreement shall
be construed to give to any Person other than the Company, the Rights Agent and
the registered holders of the Rights Certificates (and, prior to the
Distribution Date, the Common Shares) any legal or equitable right, remedy or
claim pursuant to this Agreement; but this Agreement shall be for the sole and
exclusive benefit of the Company, the Rights Agent and the registered holders of
the Rights Certificates (and, prior to the Distribution Date, the Common
Shares).

        Section 31. Severability. If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction or
other authority to be invalid, void or unenforceable, the remainder of the
terms, provisions, covenants and restrictions of this Agreement shall remain in
full force and effect and shall in no way be affected, impaired or invalidated;
provided, however, that notwithstanding anything in this Agreement to the
contrary, if any such term, provision, covenant or restriction is held by such
court or authority to be invalid, void or unenforceable and the Board of
Directors of the Company determines in its good faith judgment that severing the
invalid language from this Agreement would adversely affect the purpose or
effect of this Agreement, the right of redemption set forth in Section 23 hereof
shall be reinstated and shall not expire until the Close of Business on the
tenth day following the date of such determination by the Board of Directors.

        Section 32. Governing Law. This Agreement and each Right and each Rights
Certificate issued hereunder shall be deemed to be a contract made under the
laws of the State of Delaware and for all purposes shall be governed by and
construed in accordance with the laws of such State applicable to contracts to
be made and performed entirely within such State.

                                      -36-
<PAGE>   40

        Section 33. Counterparts. This Agreement may be executed in any number
of counterparts and each of such counterparts shall for all purposes be deemed
to be an original, and all such counterparts shall together constitute but one
and the same instrument.

        Section 34. Descriptive Headings. Descriptive headings of the several
Sections of this Agreement are inserted for convenience only and shall not
control or affect the meaning or construction of any of the provisions hereof.

        IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.

"COMPANY"                              DIGITALTHINK, INC.

                                       By:  /s/ Peter J. Goettner
                                          --------------------------------------
                                       Name:  Peter J. Goettner
                                       Title:  Chairman, President, and Chief
                                               Executive Officer

"RIGHTS AGENT"                         WELLS FARGO & COMPANY

                                       By:  /s/ Karri L. Van Dell
                                          --------------------------------------
                                       Name:  Karri L. Van Dell
                                       Title:  Assistant Vice President

                                      -37-
<PAGE>   41

                                    EXHIBIT A

                CERTIFICATE OF DESIGNATION OF RIGHTS, PREFERENCES
                                AND PRIVILEGES OF
                     SERIES A PARTICIPATING PREFERRED STOCK
                              OF DIGITALTHINK, INC

        The undersigned, Peter J. Goettner and Adam D. Levy do hereby certify:

        1. That they are the duly elected and acting President and Secretary,
respectively, of DigitalThink, Inc., a Delaware corporation (the "CORPORATION").

        2. That pursuant to the authority conferred upon the Board of Directors
by the Amended and Restated Certificate of Incorporation of the Corporation, the
Board of Directors on September 15, 2000 adopted the following resolution
creating a series of 100,000 shares of Preferred Stock designated as Series A
Participating Preferred Stock:

        "RESOLVED, that pursuant to the authority vested in the Board of
Directors of the corporation by the Amended and Restated Certificate of
Incorporation, the Board of Directors does hereby provide for the issue of a
series of Preferred Stock of the Corporation and does hereby fix and herein
state and express the designations, powers, preferences and relative and other
special rights and the qualifications, limitations and restrictions of such
series of Preferred Stock as follows:

        Section 1. Designation and Amount. The shares of such series shall be
designated as "SERIES A PARTICIPATING PREFERRED STOCK." The Series A
Participating Preferred Stock shall have a par value of $0.001 per share, and
the number of shares constituting such series shall be 100,000.

        Section 2. Proportional Adjustment. In the event that the Corporation
shall at any time after the issuance of any share or shares of Series A
Participating Preferred Stock (i) declare any dividend on Common Stock of the
Corporation ("COMMON STOCK") payable in shares of Common Stock, (ii) subdivide
the outstanding Common Stock or (iii) combine the outstanding Common Stock into
a smaller number of shares, then in each such case the Corporation shall
simultaneously effect a proportional adjustment to the number of outstanding
shares of Series A Participating Preferred Stock.

        Section 3. Dividends and Distributions.

                (a) Subject to the prior and superior right of the holders of
any shares of any series of Preferred Stock ranking prior and superior to the
shares of Series A Participating Preferred Stock with respect to dividends, the
holders of shares of Series A Participating Preferred Stock shall be entitled to
receive when, as and if declared by the Board of Directors out of funds legally
available for the purpose, quarterly dividends payable in cash on the last day
of February, May, August and November in each year (each such date being
referred to herein as a "QUARTERLY

<PAGE>   42

DIVIDEND PAYMENT DATE"), commencing on the first Quarterly Dividend Payment Date
after the first issuance of a share or fraction of a share of Series A
Participating Preferred Stock, in an amount per share (rounded to the nearest
cent) equal to 1,000 times the aggregate per share amount of all cash dividends,
and 1,000 times the aggregate per share amount (payable in kind) of all non-cash
dividends or other distributions other than a dividend payable in shares of
Common Stock or a subdivision of the outstanding shares of Common Stock (by
reclassification or otherwise), declared on the Common Stock since the
immediately preceding Quarterly Dividend Payment Date, or, with respect to the
first Quarterly Dividend Payment Date, since the first issuance of any share or
fraction of a share of Series A Participating Preferred Stock.

                (b) The Corporation shall declare a dividend or distribution on
the Series A Participating Preferred Stock as provided in paragraph (a) above
immediately after it declares a dividend or distribution on the Common Stock
(other than a dividend payable in shares of Common Stock).

                (c) Dividends shall begin to accrue on outstanding shares of
Series A Participating Preferred Stock from the Quarterly Dividend Payment Date
next preceding the date of issue of such shares of Series A Participating
Preferred Stock, unless the date of issue of such shares is prior to the record
date for the first Quarterly Dividend Payment Date, in which case dividends on
such shares shall begin to accrue from the date of issue of such shares, or
unless the date of issue is a Quarterly Dividend Payment Date or is a date after
the record date for the determination of holders of shares of Series A
Participating Preferred Stock entitled to receive a quarterly dividend and
before such Quarterly Dividend Payment Date, in either of which events such
dividends shall begin to accrue from such Quarterly Dividend Payment Date.
Accrued but unpaid dividends shall not bear interest. Dividends paid on the
shares of Series A Participating Preferred Stock in an amount less than the
total amount of such dividends at the time accrued and payable on such shares
shall be allocated pro rata on a share-by-share basis among all such shares at
the time outstanding. The Board of Directors may fix a record date for the
determination of holders of shares of Series A Participating Preferred Stock
entitled to receive payment of a dividend or distribution declared thereon,
which record date shall be no more than 30 days prior to the date fixed for the
payment thereof.

        Section 4. Voting Rights. The holders of shares of Series A
Participating Preferred Stock shall have the following voting rights:

                (a) Each share of Series A Participating Preferred Stock shall
entitle the holder thereof to 1,000 votes on all matters submitted to a vote of
the stockholders of the Corporation.

                (b) Except as otherwise provided herein or by law, the holders
of shares of Series A Participating Preferred Stock and the holders of shares of
Common Stock shall vote together as one class on all matters submitted to a vote
of stockholders of the Corporation.

                (c) Except as required by law, the holders of Series A
Participating Preferred Stock shall have no special voting rights and their
consent shall not be required (except to the extent

                                      -2-
<PAGE>   43

that they are entitled to vote with holders of Common Stock as set forth herein)
for taking any corporate action.

        Section 5. Certain Restrictions.

                (a) The Corporation shall not declare any dividend on, make any
distribution on, or redeem or purchase or otherwise acquire for consideration
any shares of Common Stock after the first issuance of a share or fraction of a
share of Series A Participating Preferred Stock unless concurrently therewith it
shall declare a dividend on the Series A Participating Preferred Stock as
required by Section 3 hereof.

                (b) Whenever quarterly dividends or other dividends or
distributions payable on the Series A Participating Preferred Stock as provided
in Section 3 are in arrears, thereafter and until all accrued and unpaid
dividends and distributions, whether or not declared, on shares of Series A
Participating Preferred Stock outstanding shall have been paid in full, the
Corporation shall not

                        (i) declare or pay dividends on, make any other
distributions on, or redeem or purchase or otherwise acquire for consideration
any shares of stock ranking junior (either as to dividends or upon liquidation,
dissolution or winding up) to the Series A Participating Preferred Stock;

                        (ii) declare or pay dividends on, or make any other
distributions on any shares of stock ranking on a parity (either as to dividends
or upon liquidation, dissolution or winding up) with the Series A Participating
Preferred Stock, except dividends paid ratably on the Series A Participating
Preferred Stock and all such parity stock on which dividends are payable or in
arrears in proportion to the total amounts to which the holders of all such
shares are then entitled;

                        (iii) redeem or purchase or otherwise acquire for
consideration shares of any stock ranking on a parity (either as to dividends or
upon liquidation, dissolution or winding up) with the Series A Participating
Preferred Stock, provided that the Corporation may at any time redeem, purchase
or otherwise acquire shares of any such parity stock in exchange for shares of
any stock of the Corporation ranking junior (either as to dividends or upon
dissolution, liquidation or winding up) to the Series A Participating Preferred
Stock;

                        (iv) purchase or otherwise acquire for consideration any
shares of Series A Participating Preferred Stock, or any shares of stock ranking
on a parity with the Series A Participating Preferred Stock, except in
accordance with a purchase offer made in writing or by publication (as
determined by the Board of Directors) to all holders of such shares upon such
terms as the Board of Directors, after consideration of the respective annual
dividend rates and other relative rights and preferences of the respective
series and classes, shall determine in good faith will result in fair and
equitable treatment among the respective series or classes.

                (c) The Corporation shall not permit any subsidiary of the
Corporation to purchase or otherwise acquire for consideration any shares of
stock of the Corporation unless the

                                      -3-
<PAGE>   44

Corporation could, under paragraph (a) of this Section 5, purchase or otherwise
acquire such shares at such time and in such manner.

        Section 6. Reacquired Shares. Any shares of Series A Participating
Preferred Stock purchased or otherwise acquired by the Corporation in any manner
whatsoever shall be retired and canceled promptly after the acquisition thereof.
All such shares shall upon their cancellation become authorized but unissued
shares of Preferred Stock and may be reissued as part of a new series of
Preferred Stock to be created by resolution or resolutions of the Board of
Directors, subject to the conditions and restrictions on issuance set forth
herein and in the Restated Certificate of Incorporation, as then amended.

        Section 7. Liquidation, Dissolution or Winding Up. Upon any liquidation,
dissolution or winding up of the Corporation, the holders of shares of Series A
Participating Preferred Stock shall be entitled to receive an aggregate amount
per share equal to 1,000 times the aggregate amount to be distributed per share
to holders of shares of Common Stock plus an amount equal to any accrued and
unpaid dividends on such shares of Series A Participating Preferred Stock.

        Section 8. Consolidation, Merger, etc. In case the Corporation shall
enter into any consolidation, merger, combination or other transaction in which
the shares of Common Stock are exchanged for or changed into other stock or
securities, cash and/or any other property, then in any such case the shares of
Series A Participating Preferred Stock shall at the same time be similarly
exchanged or changed in an amount per share equal to 1,000 times the aggregate
amount of stock, securities, cash and/or any other property (payable in kind),
as the case may be, into which or for which each share of Common Stock is
changed or exchanged.

        Section 9. No Redemption. The shares of Series A Participating Preferred
Stock shall not be redeemable.

        Section 10. Ranking. The Series A Participating Preferred Stock shall
rank junior to all other series of the Corporation's Preferred Stock as to the
payment of dividends and the distribution of assets, unless the terms of any
such series shall provide otherwise.

        Section 11. Amendment. The Restated Certificate of Incorporation of the
Corporation shall not be further amended in any manner which would materially
alter or change the powers, preference or special rights of the Series A
Participating Preferred Stock so as to affect them adversely without the
affirmative vote of the holders of a majority of the outstanding shares of
Series A Participating Preferred Stock, voting separately as a series.

        Section 12. Fractional Shares. Series A Participating Preferred Stock
may be issued in fractions of a share which shall entitle the holder, in
proportion to such holder's fractional shares, to exercise voting rights,
receive dividends, participate in distributions and to have the benefit of all
other rights of holders of Series A Participating Preferred Stock.

                                      -4-
<PAGE>   45

        RESOLVED FURTHER, that the President or any Vice President and the
Secretary or any Assistant Secretary of this corporation be, and they hereby
are, authorized and directed to prepare and file a Certificate of Designation of
Rights, Preferences and Privileges in accordance with the foregoing resolution
and the provisions of Delaware law and to take such actions as they may deem
necessary or appropriate to carry out the intent of the foregoing resolution.

        We further declare under penalty of perjury that the matters set forth
in the foregoing Certificate of Designation are true and correct of our own
knowledge.

        Executed at San Francisco, California on ______, 2000.

                                       -----------------------------------------
                                       President

                                       -----------------------------------------
                                       Secretary

                                      -5-
<PAGE>   46

                                    EXHIBIT B

                           FORM OF RIGHTS CERTIFICATE

Certificate No. R-                                              _________ Rights

          NOT EXERCISABLE AFTER THE EARLIER OF (i) OCTOBER 23, 2010, (ii)
          THE DATE TERMINATED BY THE COMPANY OR (iii) THE DATE THE COMPANY
          EXCHANGES THE RIGHTS PURSUANT TO THE RIGHTS AGREEMENT. THE
          RIGHTS ARE SUBJECT TO REDEMPTION, AT THE OPTION OF THE COMPANY,
          AT $0.001 PER RIGHT ON THE TERMS SET FORTH IN THE RIGHTS
          AGREEMENT. UNDER CERTAIN CIRCUMSTANCES, RIGHTS BENEFICIALLY
          OWNED BY AN ACQUIRING PERSON OR AN AFFILIATE OR ASSOCIATE OF AN
          ACQUIRING PERSON (AS SUCH TERMS ARE DEFINED IN THE RIGHTS
          AGREEMENT) AND ANY SUBSEQUENT HOLDER OF SUCH RIGHTS MAY BECOME
          NULL AND VOID. [THE RIGHTS REPRESENTED BY THIS RIGHTS
          CERTIFICATE ARE OR WERE BENEFICIALLY OWNED BY A PERSON WHO WAS
          OR BECAME AN ACQUIRING PERSON OR AN AFFILIATE OR ASSOCIATE OF AN
          ACQUIRING PERSON (AS SUCH TERMS ARE DEFINED IN THE RIGHTS
          AGREEMENT). ACCORDINGLY, THIS RIGHTS CERTIFICATE AND THE RIGHTS
          REPRESENTED HEREBY MAY BECOME NULL AND VOID IN THE CIRCUMSTANCES
          SPECIFIED IN SECTION 7(e) OF SUCH RIGHTS AGREEMENT.](1)

                               RIGHTS CERTIFICATE

                                DIGITALTHINK, INC

        This certifies that ______________________________, or registered
assigns, is the registered owner of the number of Rights set forth above, each
of which entitles the owner thereof, subject to the terms, provisions and
conditions of the Rights Agreement dated as of September 15, 2000, (the "RIGHTS
AGREEMENT"), between DigitalThink, Inc., a Delaware corporation (the "COMPANY"),
and Wells Fargo & Company ( the "RIGHTS AGENT"), to purchase from the Company at
any time after the Distribution Date (as such term is defined in the Rights
Agreement) and prior to 5:00 P.M., New York time, on October 23, 2010 at the
office of the Rights Agent designated for such purpose, or at the office of its
successor as Rights Agent, one one-thousandth (1/1,000) of a

----------

(1)     The portion of the legend in bracket shall be inserted only if
        applicable and shall replace the preceding sentence.

<PAGE>   47

fully paid and non-assessable share of Series A Participating Preferred Stock,
par value $0.001 per share (the "PREFERRED SHARES"), of the Company, at an
Exercise Price of Two Hundred Fifty Dollars ($250.00) per one-thousandth of a
Preferred Share (the "EXERCISE PRICE"), upon presentation and surrender of this
Rights Certificate with the Form of Election to Purchase and related Certificate
duly executed. The number of Rights evidenced by this Rights Certificate (and
the number of one-thousandths of a Preferred Share which may be purchased upon
exercise hereof) set forth above are the number and Exercise Price as of October
23, 2000, based on the Preferred Shares as constituted at such date. As provided
in the Rights Agreement, the Exercise Price and the number and kind of Preferred
Shares or other securities which may be purchased upon the exercise of the
Rights evidenced by this Rights Certificate are subject to modification and
adjustment upon the happening of certain events.

                This Rights Certificate is subject to all of the terms,
provisions and conditions of the Rights Agreement, which terms, provisions and
conditions are hereby incorporated herein by reference and made a part hereof
and to which Rights Agreement reference is hereby made for a full description of
the rights, limitations of rights, obligations, duties and immunities hereunder
of the Rights Agent, the Company and the holders of the Rights Certificates,
which limitations of rights include the temporary suspension of the
exercisability of such Rights under the specific circumstances set forth in the
Rights Agreement. Copies of the Rights Agreement are on file at the principal
executive offices of the Company and the above-mentioned office of the Rights
Agent.

                Subject to the provisions of the Rights Agreement, the Rights
evidenced by this Rights Certificate (i) may be redeemed by the Company, at its
option, at a redemption price of $0.001 per Right or (ii) may be exchanged by
the Company in whole or in part for Common Shares, substantially equivalent
rights or other consideration as determined by the Company.

                This Rights Certificate, with or without other Rights
Certificates, upon surrender at the office of the Rights Agent designated for
such purpose, may be exchanged for another Rights Certificate or Rights
Certificates of like tenor and date evidencing Rights entitling the holder to
purchase a like aggregate amount of securities as the Rights evidenced by the
Rights Certificate or Rights Certificates surrendered shall have entitled such
holder to purchase. If this Rights Certificate shall be exercised in part, the
holder shall be entitled to receive upon surrender hereof another Rights
Certificate or Rights Certificates for the number of whole Rights not exercised.

                No fractional portion of less than one one-thousandth of a
Preferred Share will be issued upon the exercise of any Right or Rights
evidenced hereby but in lieu thereof a cash payment will be made, as provided in
the Rights Agreement.

                No holder of this Rights Certificate, as such, shall be entitled
to vote or receive dividends or be deemed for any purpose the holder of the
Preferred Shares or of any other securities of the Company which may at any time
be issuable on the exercise hereof, nor shall anything contained in the Rights
Agreement or herein be construed to confer upon the holder hereof, as such, any
of the rights of a stockholder of the Company or any right to vote for the
election of directors or upon any matter submitted to stockholders at any
meeting thereof, or to give or withhold consent to any corporate action, or to
receive notice of meetings or other actions affecting stockholders (except

                                      -2-
<PAGE>   48

as provided in the Rights Agreement), or to receive dividends or subscription
rights, or otherwise, until the Right or Rights evidenced by this Rights
Certificate shall have been exercised as provided in the Rights Agreement.

        This Rights Certificate shall not be valid or obligatory for any purpose
until it shall have been countersigned by the Rights Agent.

        WITNESS the facsimile signature of the proper officers of the Company
and its corporate seal. Dated as of _______________, _____.

ATTEST:                                DIGITALTHINK, INC

                                       By:
-----------------------------             -------------------------------------
Secretary

                                       Its:
                                           ------------------------------------

Countersigned:

WELLS FARGO & COMPANY
as Rights Agent

By:
  ---------------------------

Its:
  ---------------------------

                                      -3-
<PAGE>   49

                   FORM OF REVERSE SIDE OF RIGHTS CERTIFICATE

                               FORM OF ASSIGNMENT

                (To be executed by the registered holder if such
               holder desires to transfer the Rights Certificate)

        FOR VALUE RECEIVED _______________ hereby sells, assigns and transfers
unto ___________________________________________________________________________
                 (Please print name and address of transferee)
_______________________________________________________________________________
this Rights Certificate, together with all right, title and interest therein,
and does hereby irrevocably constitute and appoint __________________________
Attorney, to transfer the within Rights Certificate on the books of the
within-named Company, with full power of substitution.

Dated:           ,
     ------------ -----
                                             -----------------------------------
                                             Signature

Signature Guaranteed:

        Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., or a commercial bank or trust company having an office or correspondent in
the United States.

<PAGE>   50

                                   CERTIFICATE

        The undersigned hereby certifies by checking the appropriate boxes that:

                (1) this Rights Certificate [ ] is [ ] is not being sold,
assigned and transferred by or on behalf of a Person who is or was an Acquiring
Person, or an Affiliate or Associate of any such Person (as such terms are
defined in the Rights Agreement);

                (2) after due inquiry and to the best knowledge of the
undersigned, it [ ] did [ ] did not acquire the Rights evidenced by this Rights
Certificate from any Person who is, was or subsequently became an Acquiring
Person or an Affiliate or Associate of any such Person.

Dated:                ,
      ----------------  ----

                                            ------------------------------------
                                            Signature

Signature Guaranteed:

        Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., or a commercial bank or trust company having an office or correspondent in
the United States.

<PAGE>   51

             FORM OF REVERSE SIDE OF RIGHTS CERTIFICATE -- CONTINUED

                          FORM OF ELECTION TO PURCHASE

                      (To be executed if holder desires to
                        exercise the Rights Certificate)

To:___________________________

        The undersigned hereby irrevocably elects to exercise
_________________________ Rights represented by this Rights Certificate to
purchase the number of one-thousandths of a Preferred Share issuable upon the
exercise of such Rights and requests that certificates for such number of
one-thousandths of a Preferred Share issued in the name of:

Please insert social security
or other identifying number
________________________________________________________________________________
                         (Please print name and address)

________________________________________________________________________________

If such number of Rights shall not be all the Rights evidenced by this Rights
Certificate, a new Rights Certificate for the balance remaining of such Rights
shall be registered in the name of and delivered to:

Please insert social security
or other identifying number
________________________________________________________________________________
                         (Please print name and address)

________________________________________________________________________________

Dated:                ,
      ----------------  ----
                                            ------------------------------------
                                            Signature

Signature Guaranteed:

        Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., or a commercial bank or trust company having an office or correspondent in
the United States.

<PAGE>   52

                                   CERTIFICATE

        The undersigned hereby certifies by checking the appropriate boxes that:

                (1) the Rights evidenced by this Rights Certificate [ ] are [ ]
are not being exercised by or on behalf of a Person who is or was an Acquiring
Person or an Affiliate or Associate of any such Person (as such terms are
defined in the Rights Agreement);

                (2) after due inquiry and to the best knowledge of the
undersigned, it [ ] did [ ] did not acquire the Rights evidenced by this Rights
Certificate from any Person who is, was or subsequently became an Acquiring
Person or an Affiliate or Associate of any such Person.

Dated:                ,
      ----------------  ----

                                            ------------------------------------
                                            Signature

Signature Guaranteed:

        Signatures must be guaranteed by a member firm of a registered national
securities exchange, a member of the National Association of Securities Dealers,
Inc., or a commercial bank or trust company having an office or correspondent in
the United States.

<PAGE>   53

             FORM OF REVERSE SIDE OF RIGHTS CERTIFICATE -- CONTINUED

                                     NOTICE

        The signature in the foregoing Forms of Assignment and Election must
conform to the name as written upon the face of this Rights Certificate in every
particular, without alteration or enlargement or any change whatsoever.

<PAGE>   54

                                    EXHIBIT C

                             STOCKHOLDER RIGHTS PLAN

                                DIGITALTHINK, INC

                                SUMMARY OF RIGHTS

DISTRIBUTION AND                The Board of Directors has declared a dividend
TRANSFER OF RIGHTS;             of one Right for each share of DigitalThink,
RIGHTS CERTIFICATE:             Inc.'s (the "COMPANY") Common Stock outstanding.
                                Prior to the Distribution Date referred to
                                below, the Rights will be evidenced by and trade
                                with the certificates for the Common Stock.
                                After the Distribution Date, the Company will
                                mail Rights certificates to the Company's
                                stockholders and the Rights will become
                                transferable apart from the Common Stock.

DISTRIBUTION DATE:              Rights will separate from the Common Stock and
                                become exercisable following (a) the tenth
                                business day (or such later date as may be
                                determined by the Company's Board of Directors)
                                after a person or group acquires beneficial
                                ownership of 15% or more of the Company's Common
                                Stock or (b) the tenth business day (or such
                                later date as may be determined by the Company's
                                Board of Directors) after a person or group
                                announces a tender or exchange offer, the
                                consummation of which would result in ownership
                                by a person or group of 15% or more of the
                                Company's Common Stock.

PREFERRED STOCK                 After the Distribution Date, each Right will
PURCHASABLE UPON                entitle the holder to purchase for $ 250.00 (the
EXERCISE OF RIGHTS:             "EXERCISE PRICE"), a fraction of a share of the
                                Company's Preferred Stock with economic terms
                                similar to that of one share of the Company's
                                Common Stock.

FLIP-IN:                        If an acquiror (an "ACQUIRING PERSON") obtains
                                15% or more of the Company's Common Stock, then
                                each Right (other than Rights owned by an
                                Acquiring Person or its affiliates) will entitle
                                the holder thereof to purchase, for the Exercise
                                Price, a number of shares of the Company's
                                Common Stock having a then-current market value
                                of twice the Exercise Price.

FLIP-OVER:                      If, after an Acquiring Person obtains 15% or
                                more of the Company's Common Stock, (a) the
                                Company merges into another entity, (b) an
                                acquiring entity merges into the Company or (c)
                                the Company sells more than 50% of the Company's
                                assets or earning power, then each Right (other
                                than Rights owned by an Acquiring Person or
                                its affiliates) will entitle the holder thereof
                                to purchase, for the Exercise Price, a number of
                                shares of Common Stock of the person engaging in
                                the transaction having a then current market
                                value of twice the Exercise Price.

EXCHANGE PROVISION:             At any time after the date on which an Acquiring
                                Person obtains 15% or more of the Company's
                                Common Stock and prior to the acquisition by the
                                Acquiring Person of 50% of the outstanding
                                Common Stock, a majority of the Board of
                                Directors and the Board of Directors of the
                                Company may exchange the Rights (other than
                                Rights owned by the Acquiring Person or its
                                affiliates), in whole or in part, for shares of
                                Common Stock of the Company at an exchange ratio
                                of one share of Common Stock per Right (subject
                                to

<PAGE>   55

                                adjustment).

REDEMPTION OF THE               Rights will be redeemable at the Company's
RIGHTS:                         option for $0.001 per Right at any time on or
                                prior to the fifth day (or such later date as
                                may be determined by the Company's Board of
                                Directors) after public announcement that a
                                Person has acquired beneficial ownership of 15%
                                or more of the Company's Common Stock (the
                                "SHARES ACQUISITION DATE").

EXPIRATION OF THE               The Rights expire on the earliest of (a) October
RIGHTS:                         23, 2010 or (b) exchange or redemption of the
                                Rights as described above, or (c) consummation
                                of a merger, consolidation, or asset sale
                                resulting in expiration of the Rights described
                                above.

AMENDMENT OF TERMS              The terms of the Rights and the Rights Agreement
OF RIGHTS:                      may be amended in any respect without the
                                consent of the Rights holders on or prior to the
                                Distribution Date; thereafter, the terms of the
                                Rights and the Rights Agreement may be amended
                                without the consent of the Rights holders in
                                order to cure any ambiguities or to make changes
                                which do not adversely affect the interests of
                                Rights holders (other than the Acquiring
                                Person).

VOTING RIGHTS:                  Rights will not have any voting rights.

ANTI-DILUTION                   Rights will have the benefit of certain
PROVISIONS:                     customary anti-dilution provisions.

TAXES:                          The Rights distribution should not be taxable
                                for federal income tax purposes. However,
                                following an event which renders the Rights
                                exercisable or upon redemption of the Rights,
                                stockholders may recognize taxable income.

The foregoing is a summary of certain principal terms of the Stockholder Rights
Plan. It may be amended from time to time. A copy of the Rights Agreement will
be filed with the Securities and Exchange Commission as an Exhibit to a
Registration Statement on Form 8-A dated September ___, 2000. A copy of the
Rights Agreement is available free of charge from the Company.

                                      -2-

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