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                                                                     EXHIBIT 4.2

                          AMENDMENT TO RIGHTS AGREEMENT

         The Rights Agreement dated as of August 17, 1999 between Devon Energy
Corporation and Fleet National Bank, f/k/a BankBoston, N.A., a national banking
association, as amended to date, is hereby amended as of May 25, 2000 as
follows:

         1.   The Rights Agreement is hereby amended to add a new Section 35 as
            follows:

         Section 35. Santa Fe Snyder Exclusion. Notwithstanding anything in this
         Agreement to the contrary, none of Santa Fe Snyder Corporation, a
         Delaware corporation ("Santa Fe Snyder") or any of its Affiliates or
         Associates shall be deemed an Acquiring Person and no Stock Acquisition
         Date shall be deemed to have occurred as a result of any of the Santa
         Fe Snyder Transaction Agreements (as defined below) or any of the
         transactions contemplated thereby. As used herein, "Santa Fe Snyder
         Transaction Agreements" means (i) the Agreement and Plan of Merger,
         dated as of May 25, 2000 (the "Merger Agreement"), by and among the
         Company, a wholly-owned subsidiary of the Company and Santa Fe Snyder,
         (ii) the Stock Option Agreements (as defined in the Merger Agreement);
         and (iii) any other agreements between or among the Company and Santa
         Fe Snyder and/or any of their respective subsidiaries entered into in
         connection with the Merger Agreement.

              IN WITNESS WHEREOF, the parties hereto have caused this Agreement
to be duly exercised, all as of the 25th day of May, 2000.

                                     DEVON ENERGY CORPORATION

                                     By /s/ J. Larry Nichols
                                        ----------------------------------------
                                          J. Larry Nichols
                                          President and Chief Executive Officer
ATTEST:

/s/ Marian J. Moon
-----------------------------
Marian J. Moon, Secretary

                                     FLEET NATIONAL BANK, f/k/a BANKBOSTON, N.A,
                                     a national banking association

                                     By /s/ Carol  Mulvey-Eori
                                        ----------------------------------------
                                          Administration Manager
ATTEST:

/s/ Jocelyn Turner
-----------------------------
Account AdministratorExhibit 4.7

                          INTERNET COMMERCE CORPORATION

                                STOCK OPTION PLAN

                   (Amended and restated as of June 30, 1999)

1.    Purpose.

      The purpose of this Internet Commerce Corporation Stock Option Plan (the
"Plan") is to secure for INTERNET COMMERCE CORPORATION (the "Company") and its
stockholders the benefits arising from capital stock ownership by employees,
officers and directors of, and consultants or advisers to, the Company and its
subsidiary corporations who are expected to contribute to the Company's future
growth and success. Except where the context otherwise requires, the term
"Company" shall include all present and future subsidiaries of the Company as
defined in Sections 424(e) and 424(f) of the Internal Revenue Code of 1986, as
amended or replaced from time to time (the "Code"). Those provisions of the Plan
which make express reference to Section 422 of the Code shall apply only to
Incentive Stock Options (as that term is defined in the Plan) granted under the
Plan.

2.    Type of Options and Administration.

      (a) Types of Options. Options granted pursuant to the Plan ("Options")
shall be authorized by action of the board of Directors of the Company (the
"Board of Directors") (or a committee designated by the Board of Directors of
the Company) and may be either incentive stock options within the meaning of
Section 422 of the Code ("Incentive Stock Options") or non-qualified options,
which are not intended to meet the requirements of Section 422 of the Code.

      Options shall be evidenced by agreements in such form as the "Committee"
(as hereinafter defined) shall from time to time approve. All Options granted
under the Plan shall be clearly identified in the agreement evidencing such
Options as either Incentive Stock Options or as non-qualified options.

      If and to the extent the Board of Directors determines it is appropriate
for the compensation payable as a result of a grant of any Option to qualify as
"performance-based compensation" within the meaning of Section 162(m)(4)(C) of
the Code, such Option shall be authorized and granted by the compensation
committee or a similar committee of the Board of Directors (or a subcommittee
thereof), which shall consist of two or more individuals, each of whom is an
"outside director" within the meaning of Section 162(m) of the Code and the
regulations thereunder.

      (b) Administration. The Plan will be administered by a committee (the
"Committee") appointed by the Board of Directors. The delegation of powers to
the Committee shall be consistent with applicable laws or regulations
(including, without limitation, applicable state law, Rule 16b-3 promulgated
under the Securities Exchange Act of 1934 (the "Exchange Act"), or any successor
rule ("Rule 16b-3") and Section 162(m) of the Code). The Committee may, in its
sole discretion, grant Options to purchase shares of the Company's Common Stock,
$.01 par

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value per share ("Common Stock") and issue shares upon exercise of such Options
as provided in the Plan. The Committee shall have full authority, subject to the
express provisions of the Plan, to administer the Plan, including authority to
interpret and construe any provision of the respective Option agreements and the
Plan, to prescribe, amend and rescind such rules and regulations relating to the
Plan as the Committee shall deem necessary or appropriate, to determine the
terms and provisions of the respective Option agreements, which need not be
identical, and make all other determinations, which are, in the judgment of the
Committee necessary or desirable for the administration of the Plan. All
decisions of the Committee with respect to the Plan or any Option agreement
shall be final and binding on all parties. The Committee's determinations under
the Plan may, but need not, be uniform and may be made on a
participant-by-participant basis (whether or not two or more participants are
similarly situated). The Committee may correct any defect or supply any omission
or reconcile any inconsistency in the Plan or in any Option agreement in the
manner and to the extent it shall deem expedient to carry the Plan into effect
and it shall be the sole and final judge of such expediency.

            No member of the Committee shall be liable for any action, omission,
or determination relating to the Plan, and the Company shall indemnify and hold
harmless each member of the Committee and each other director or employee of the
Company to whom any duty or power relating to the administration or
interpretation of the Plan has been delegated against any cost or expense
(including counsel fees) or liability (including any sum paid in settlement of a
claim with the approval of the Committee) arising out of any action, omission or
determination relating to the Plan, unless, in either case, such action,
omission or determination was taken or made by such member, director or employee
in bad faith and without reasonable belief that it was in the best interests of
the Company.

            Subject to adjustment as provided in Section 15 below, the aggregate
number of shares of Common Stock that may be subject to Options granted to any
person in a calendar year shall not exceed 300,000 shares of Common Stock.

3.    Eligibility.

      (a) General. Options may be granted to persons selected by the Committee,
in its discretion, who are, at the time of grant, employees, officers or
directors of, or consultants or advisers to, the Company, provided, that,
Incentive Stock Options may be granted only to individuals who are employees of
the Company (within the meaning of Section 3401(c) of the Code). A person who
has been granted an Option may, if he or she is otherwise eligible, be granted
additional Options if the Committee shall so determine, although no such person
shall have an entitlement to receive a grant of any additional Options.

      (b) Grant of Options to Reporting Persons and Certain "Covered Employees".
If and to the extent it is intended that any grant of an Option to a director or
an officer who is a Reporting Person (as the terms "director" and "officer" are
defined for purposes of Rule 16b-3) shall comply with Rule 16b-3, the decision
to make the Option grant, the timing of the Option grant, the exercise price of
the Option, the number of shares subject to the Option and the other terms of
the Option shall be determined either by (i) the Board of Directors, (ii) a
committee consisting of two or more directors having full authority to act in
the matter, each of whom shall be a "non-employee director" within the meaning
of Rule 16b-3(b)(3) or (iii) pursuant to

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provisions for automatic grants set forth in Section 3(c) below. If and to the
extent it is intended that any Compensation payable as a result of any grant of
an Option to an individual who is or may become a "covered employee" within the
meaning of Section 162(m)(3) of the Code shall be considered qualified
"performance-based compensation" within the meaning of Section 162(m)(4)(C) of
the Code and the regulations thereunder, the decision to make the Option grant,
the timing of the Option grant, the exercise price of the Option, the number of
shares subject to the Option and the other terms of the Option shall be
determined by a committee consisting of two or more directors having full
authority to act in the matter, each of whom shall be an "outside director"
within the meaning of Section 162(m)(4)(C) of the Code and the regulations
thereunder.

4.    Stock Subject to Plan.

      The stock subject to Options granted under the Plan shall be shares of
authorized but unissued or reacquired Common Stock. Subject to adjustment as
provided in Section 15 below, the maximum number of shares of Common Stock that
may be issued and sold under the Plan since its inception in 1994 is 5,000,000
shares. If an Option granted under the Plan shall expire, terminate or is
cancelled for any reason without having been exercised in full, the unpurchased
shares subject to such Option shall again be available for subsequent Option
grants under the Plan.

5.    Forms of Option Agreements.

      As a condition to the grant of an Option under the Plan, each recipient of
an Option shall execute an Option agreement in such form not inconsistent with
the Plan as may be approved by the Committee. Such Option agreements may differ
among recipients.

6.    Purchase Price.

      General. The purchase price-per-share of stock deliverable upon the
exercise of an Option shall be determined by the Committee at the time of grant
of such Option; provided, however, that in the case of an Incentive Stock Option
or any Option the compensation payable as a result of which is intended to
constitute qualified "performance-based compensation" under Section 162(m)(4)(C)
of the Code, the exercise price shall not be less than (i) 100% of the Fair
Market Value (as hereinafter defined) of such stock, at the time of grant of
such Option, or (ii) solely in the case of an Incentive Stock Option described
in Section 11(b), 110% of such Fair Market Value. "Fair Market Value" of a share
of Common Stock of the Company as of a specified date for the purposes of the
Plan shall mean the closing price of a share of the Common Stock on the
principal securities exchange on which such shares are traded on the date
immediately preceding the date as of which Fair Market Value is being
determined, or on the next preceding date on which such shares are traded if no
shares were traded on such immediately preceding day, or if the shares are not
traded on a securities exchange, Fair Market Value shall be deemed to be the
average of the high bid and low asked prices of the shares in the
over-the-counter market on the day immediately preceding the date on which such
high bid and low asked prices were recorded. If the shares are not publicly
traded, Fair Market Value of a share of Common Stock (including, in the case of
any repurchase of shares, any distributions with respect thereto which would be
repurchased with the shares) shall be determined in good

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faith by the Committee. In no case shall Fair Market Value be determined with
regard to restrictions other than restrictions which, by their terms, will never
lapse.

      (b) Payment of Purchase Price. Options granted under the Plan may provide
for the payment of the exercise price by delivery of cash or a check to the
order of the Company in an amount equal to the exercise price of such Options,
or by any other means which are permitted by the Committee in its sole
discretion and which the Committee determines are consistent with the purpose of
the Plan and with applicable laws and regulations (including, without
limitation, the provisions of Rule 16b-3 and Regulation T promulgated by the
Federal Reserve Board).

7.    Option Period.

      Each Option shall be exercisable on such date or dates, during such period
and for such number of shares of Common Stock as shall be determined by the
Committee on the day on which such Option is granted and set forth in the
agreement evidencing such Option; provided, however, that no Option shall be
exercisable after the expiration of ten years from the date such Option was
granted; and, provided, further, however, that each Option shall be subject to
earlier termination, expiration or cancellation as provided in the Plan.

8.    Exercise of Options.

      Each Option granted under the Plan shall be exercisable either in full or
in part, subject to the provisions of the Option agreement evidencing such
Option and subject to the provisions of the Plan. Subject to the requirements in
the immediately preceding sentence, if an Option is not at the time of grant
immediately exercisable, the Committee may (i) in the agreement evidencing such
Option, provide for the acceleration of the exercise date or dates of the
subject Option upon the occurrence of specified events, and/or (ii) at any time
prior to the complete termination of an Option, accelerate the exercise date or
dates of such Option.

9.    Nontransferability of Options.

      No Option shall be assignable or otherwise transferable by the optionee
except by will or by the laws of descent and distribution or pursuant to a
qualified domestic relations order as defined in the Code or Title I of the
Employee Retirement Income Security Act of 1974, as amended, and the regulations
thereunder. An Option may be exercised during the lifetime of the optionee only
by the optionee. In the event an optionee dies during his employment by the
Company or any of its subsidiaries, or during the three-month period following
the date of termination of such employment, his Option shall thereafter be
exercisable, during the period specified in the Option agreement, by his
executors or administrators to the full extent to which such Option was
exercisable by the optionee at the time of his death during the periods set
forth in Section 10 or 11(d).

10.   Effect of Termination of Employment or Other Relationship.

      Except as provided in Section 11(d) with respect to Incentive Stock
Options, and subject to the provisions of the Plan, an optionee may exercise an
Option at any time within three (3) months following the termination of the
optionee's employment or other relationship with the Company or within one (1)
year if such termination was due to the death or "disability" of the

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optionee, but, except in the case of the optionee's death, in no event later
than the expiration date of the Option. If the termination of the optionee's
employment is for cause or is otherwise attributable to a breach by the optionee
of an employment or confidentiality or non-disclosure agreement, the Option
shall expire immediately upon such termination. The Board of Directors shall
have the power to determine what constitutes a termination for cause or a breach
of an employment or confidentiality or non-disclosure agreement, whether an
optionee has been terminated for cause or has breached such an agreement, and
the date upon which such termination for cause or breach occurs. Any such
determinations shall be final and conclusive and binding upon the optionee. For
purposes hereof, the term "disability" shall mean, except in connection with an
Incentive Stock Option, any physical or mental condition that would qualify a
Participant for a disability benefit under the long-term disability plan
maintained by the Company or, if there is no such plan, a physical or mental
condition that prevents the Participant from performing the essential functions
of the Participant's position (with or without reasonable accommodation) for a
period of six consecutive months or, in connection with an Incentive Stock
Option, a disability described in Section 422(c)(6) of the Code. The existence
of a disability shall be determined by the Committee in its absolute discretion.

11.   Incentive Stock Options.

      Options that are intended to be Incentive Stock Options shall be subject
to the following additional terms and conditions.

      (a) Express Designation. All Incentive Stock Options shall, at the time of
grant, be specifically designated as such in the Option agreement evidencing
such Incentive Stock Options.

      (b) 10% Shareholder. If any employee to whom an Incentive Stock Option is
to be granted is, at the time of the grant of such Incentive Stock Option, the
owner of stock possessing more than 10% of the total combined voting power of
all classes of stock of the Company or any of its "subsidiary corporations"
(within the meaning of Section 424 of the Code) (after taking into account the
attribution of stock ownership rules of Section 424(d) of the Code), then the
following special provisions shall be applicable to the Incentive Stock Option
granted to such individual:

            (i) the purchase price per share of the Common Stock subject to such
Incentive Stock Option shall not be less than 110% of the Fair Market Value of
one share of Common Stock at the time of grant; and

            (ii) the Option exercise period shall not exceed five years after
the date of grant.

      (c) Dollar Limitation. For so long as the Code shall so provide, Options
granted to any employee under the Plan (and any other incentive stock option
plans of the Company) that are intended to constitute Incentive Stock Options
shall not constitute Incentive Stock Options to the extent that such options, in
the aggregate, become exercisable for the first time in any one calendar year
for shares of Common Stock with an aggregate Fair Market Value, as of the
respective date or dates of grant, of more than $100,000.

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      (d) Termination of Employment, Death or Disability. No Incentive Stock
Option may be exercised unless, at the time of such exercise, the optionee is,
and has been continuously since the date of grant of his or her Option, employed
by the Company, except that:

                  (i) an Incentive Stock Option may be exercised within the
period of three months after the date of the optionee ceases to be an employee
of the Company (or within such lesser period as may be specified in the
applicable Option agreement), provided, that the agreement with respect to such
Option may designate a longer exercise period and that the exercise after such
three-month period shall be treated as the exercise of a non-qualified Option
under the Plan;

                  (ii) if the optionee dies while in the employ of the Company,
or within three months after the optionee ceases to be such an employee, the
Incentive Stock Option may be exercised by the person to whom it is transferred
by will or the laws of descent and distribution within the period of one year
after the date of death (or within such lesser period as may be specified in the
applicable Option agreement); and

                  (iii) if the optionee's employment is terminated as a result
of the optionee's disability, the Incentive Stock Option may be exercised within
the period of one year after the date the optionee ceases to be such an employee
because of such disability (or within such lesser period as may be specified in
the applicable Option agreement).

For all purposes of the Plan and any Option granted hereunder, "employment"
shall be defined in accordance with the provisions of Section 1.421-7(h) of the
Income Tax Regulations (or any successor regulations). Notwithstanding the
foregoing provisions, no Incentive Stock Option may be exercised after its
expiration date.

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12.   Additional Provision.

      (a) Additional Option Provisions. The Committee (or the Board of
Directors) may, in its sole discretion, include additional provisions in Option
agreements covering Options including without limitation restrictions on
transfer, repurchase rights, rights of first refusal, commitments to pay cash
bonuses, to make, arrange for or guarantee loans or to transfer other property
to optionees upon exercise of Option, or such other provisions as shall be
determined by the Committee in its discretion; provided, that such additional
provisions shall not be inconsistent with any other term or condition of the
Plan and such additional provisions shall not, unless otherwise specifically
intended by the Committee, cause any Incentive Stock Option granted under the
Plan to fail to qualify as an Incentive Stock Option within the meaning of
Section 422 of the Code.

      (b) Acceleration, Extension, Etc. The Committee may, in its sole
discretion, (i) accelerate the date or dates on which all or any particular
Option or options may be exercised or (ii) extend the dates during which all or
any particular Option or Options may be exercised; provided, however, that not
such extension shall be permitted if it would cause the Plan to fail to comply
with Section 422.

13.   General Restrictions.

      (a) Investment Representations. The Company may require (i) any person to
whom an Option is granted as a condition of exercising such Option, to give
written assurances, in substance and form satisfactory to the Company to the
effect that such person is acquiring the Common Stock subject to the Option for
his or her own account for investment and not with any present intention of
selling or otherwise distributing the same, and to make such other
representations or covenants, and (ii) that any certificates for shares or
Common Stock delivered in connection with the exercise of an Option bear such
legends in each case as the Company deems necessary or appropriate in order to
comply with federal and applicable state securities laws, to comply with
covenants or representations made by the Company in connection with any public
offering of its Common Stock or otherwise.

      (b) Compliance With Securities Law. Each Option shall be subject to the
requirement that if, at any time, counsel to the Company shall determine that
the listing, registration or qualification of the shares subject to such Option
upon any securities exchange or under any state or federal law, or the consent
or approval of any governmental or regulatory body, or that the disclosure of
non-public information or the satisfaction of any other condition is necessary
as a condition of, or in connection with the issuance or purchase of shares of
Common Stock thereunder, such Option may not be exercised, in whole or in part,
unless such listing, registration, qualification, consent or approval, or
satisfaction of such condition shall have been effected or obtained on
conditions acceptable to the Board of Directors. Nothing herein shall be deemed
to require the Company to apply for or to obtain such listing, registration or
qualification, or to satisfy such condition. The Committee shall inform an
optionee in writing of any decision to defer or prohibit the exercise of an
Option. During the period that the effectiveness of the exercise of an Option
has been deferred or prohibited, the optionee may, by written notice, withdraw
the optionee's decision to exercise and obtain a refund of any amount paid with
respect thereto.

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14.   Rights as a Shareholder.

      The holder of an Option shall have no rights as a shareholder with respect
to any shares covered by the Option (including, without limitation, any rights
to receive dividends or non-cash distributions with respect to such shares)
until the date of issue of a stock certificate to him or her for such shares. No
adjustment shall be made for dividends or other rights for which the record date
is prior to the date such stock certificate is issued.

15.   Adjustment Provisions for Recapitalizations, Reorganizations and Related
      Transactions.

      (a) Recapitalizations and Related Transactions. If, through or as a result
of any recapitalization, reclassification, stock dividend, stock split, reverse
stock split or other similar transaction, (i) the outstanding shares of Common
Stock are increased, decreased or exchanged for a different number or kind of
shares or other securities of the Company, or (ii) additional shares or new of
different shares or other non-cash assets are distributed with respect to such
shares of Common Stock or other securities, an appropriate and proportionate
adjustment shall be made in (x) the maximum number and kind of shares reserved
for issuance under the Plan and, to the extent permitted under Section 162(m) of
the Code and the regulations thereunder, the individual limit on grants under
Section 2, (y) the number and kind of shares or other securities subject to any
then outstanding Options, and (z) the price for each share subject to any then
outstanding Options, without changing the aggregate purchase price as to which
such Options remain exercisable. Notwithstanding the foregoing, no adjustment
shall be made pursuant to this Section 15 if such adjustment would (i) cause the
Plan to fail to comply with Section 422 of the Code or (ii) be considered as the
adoption of a new plan requiring stockholder approval.

      (b) Reorganization, Merger and Related Transactions. If the Company shall
be the surviving corporation in any reorganization, merger or consolidation of
the Company with one or more other corporations, any then outstanding Option
granted pursuant to the Plan shall pertain to and apply to the securities or
other property (including cash) to which a holder of the number of shares of
Common Stock subject to such Options would have been entitled immediately
following such reorganization, merger, or consolidation, with a corresponding
proportionate adjustment of the purchase price as to which such Options may be
exercised -shall be the same as the aggregate purchase price as to which such
Options may be exercised for the shares remaining subject to the Options
immediately prior to such reorganization, merger, or consolidation.

      (c) Committee Authority to Make Adjustments. Any adjustments under this
Section 15 will be made by the Committee, whose determination as to what
adjustments, if any, will be made and the extent thereof will be final, binding
and conclusive. No fractional shares will be issued under the Plan on account of
any such adjustments.

16.   Merger, Consolidation, Asset Sale, Liquidation, Etc.

      (a) General. In the event of any sale, merger, transfer or acquisition of
the Company of all or substantially all of the assets of the Company in which
the Company is not the surviving corporation, if the Company shall have
requested the acquiring or succeeding corporation (or an

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affiliate thereof) to assume all outstanding Options or issue substitute or
equivalent options, and such acquiring or succeeding corporation shall have
refused or failed to so assume all Options outstanding under the Plan or to so
issue substitute or equivalent options, then any and all outstanding Options
shall accelerate and become exercisable in full immediately prior to such event.
The Committee will notify holders of Options that any such Options shall be
fully exercisable for a period of time determined by the Committee in its
discretion; provided that such period shall not be less than fifteen (15) days
after the date of such notice. The Options, to the extent not exercised, shall
terminate upon expiration of the period of time determined by the Committee. In
addition, notwithstanding the foregoing, in the event of a merger, transfer or
acquisition of the Company described in this Paragraph, the Committee may, in
its sole discretion, elect to cancel, effective immediately prior to the
occurrence of such event, each Option outstanding immediately prior to such
event (whether or not then exercisable), and, in full consideration of such
cancellation, pay to the optionee to whom such Option was granted, an amount in
cash, for each share of Common Stock subject to such Option equal to the excess
of (x) the value, as determined by the Committee in its absolute discretion, of
the securities or other property or assets (including cash) to be received by
the holder of a share of Common Stock as a result of such event over (y) the
exercise price of such Option.

      (b) Substitute Options. The Company may grant Options in substitution for
options held by employees of another corporation who become employees of the
Company, or a subsidiary of the Company, as a result of a merger or
consolidation of the employing corporation with the Company or a subsidiary of
the Company, as a result of the acquisition by the Company, or one of its
subsidiaries, of property or stock of the employing corporation. The Company may
direct that substitute Options be granted on such terms and conditions as the
Committee considers appropriate in the circumstances.

17.   No Special Employment Rights.

      Nothing contained in the Plan or in any Option agreement shall confer upon
any optionee any right with respect to the continuation of his or her employment
or other relationship with the Company or interfere in any way with the right of
the Company at any time to terminate such employment or to increase or decrease
the compensation of the optionee.

18.   Other Employee Benefits.

      Except as to plans which by their terms include such amounts as
compensation, the amount of any compensation deemed to be received by an
employee as a result of the exercise of an Option or the sale of shares received
upon such exercise will not constitute compensation with respect to which any
other employee benefits of such employee are determined, including, without
limitation, benefits under any bonus, pension, profit-sharing, life insurance or
salary continuation plan, except as otherwise specifically determined by the
Board of Directors.

19.   Amendment of the Plan.

      (a) The Board of Directors may, at any time, suspend or discontinue the
Plan or revise or amend it in any respect whatsoever; provided, however, that if
and to the extent required under Section 422 of the Code (if and to the extent
that the Board of Directors deems it appropriate to comply with Section 422) and
if and to the extent required to treat some or all of the Options as qualified
"performance-based compensation" within the meaning of Section 162(m)(4)(C) of
the Code (if and to the extent that the Board of Directors deems it

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appropriate to meet such requirements), no amendment shall be effective without
the approval of the stockholders of the Company, that (i) except as provided in
Section 15 hereof, increases the number of shares of Company Stock with respect
to which Options may be issued (either to any individual in any year or in the
aggregate), (ii) modifies the class of individuals eligible to participate in
the Plan or (iii) materially increases the benefits accruing to individuals
pursuant to the Plan. Nothing herein shall restrict the Committee's ability to
exercise its discretionary authority hereunder, which discretion may be
exercised without amendment to the Plan.

      (b) The modification or amendment of the Plan shall not, without the
consent of an optionee, reduce his or her rights under an Option previously
granted to him or her. The Committee may amend outstanding Option agreements in
a manner not inconsistent with the Plan; provided, however, no such amendment
shall, without the consent of the optionee, reduce the optionee's rights under
such agreement. Notwithstanding the foregoing, the Board of Directors shall have
the right to amend or modify the terms and provisions of the Plan and of any
outstanding Incentive Stock Options granted under the Plan to the extent
necessary to qualify any or all such Options for such favorable federal income
tax treatment (including deferral of taxation upon exercise) as may be afforded
incentive stock options under Section 422 of the Code and to the extent
necessary to ensure that the amounts realized by any optionee who is a "covered
employee" within the meaning of Section 162(m) of the Code as a result of an
Option constitute qualified "performance-based compensation" within the meaning
of Section 162(m)(4)(C) of the Code.

20.   Withholding.

      (a) The Company shall have the right to deduct from payments of any kind
otherwise due to the optionee, whether under the Plan or otherwise, any federal,
state or local taxes of any kind required by law to be withheld with respect to
any shares issued upon exercise of Options. Subject to the prior approval of the
Committee, which may be withheld by the Committee in its sole discretion, the
optionee may elect to satisfy such obligations, in whole or in part, (i) by
causing the Company to withhold shares of Common Stock otherwise issuable
pursuant to the exercise of an Option or (ii) by delivering to the Company
shares of Common Stock already owned by the optionee. The shares so delivered or
withheld shall have a Fair Market Value equal to such withholding obligation as
of the date in the amount of tax to be withheld is to be determined. An optionee
who has made an election pursuant to this Section 20(a) may satisfy his or her
withholding obligation only with shares of Common Stock that are not subject to
any repurchase, forfeiture, unfulfilled vesting or other similar requirements.

      (b) The acceptance of shares of Common Stock upon exercise of an Incentive
Stock Option shall constitute an agreement by the optionee (i) to notify the
Company if any and all of such shares are disposed of by the optionee within two
years from the date the Incentive Stock Option was granted or within one year
from the date the shares were issued to the optionee pursuant to the exercise of
the Incentive Stock Option, and (ii) if required by law, to remit to the
Company, at the time of and in the case of any such disposition, an amount
sufficient to satisfy the Company's federal, state and local withholding tax
obligations with respect to such

                                      -10-
<PAGE>

disposition, whether or not, as to both (i) and (ii), the optionee is in the
employ of the Company at the time of such disposition.

21.   Cancellation and New Grant of Options, Etc.

      The Committee shall have the authority to effect, at any time and from
time to time, with the consent of the affected optionees, (i) the cancellation
of any or all outstanding Options and the grant in substitution therefor of new
Options covering the same or different numbers of shares of Common Stock and
having an Option exercise price-per-share which may be lower or higher than the
exercise price-per-share of the cancelled Options or (ii) the amendment of the
terms of any and all outstanding Options to provide an Option exercise
price-per-share which is higher or lower than the then-current exercise
price-per-share of such outstanding Options.

22.   Effective Date and Duration of the Plan.

      (a) Effective Date. The Plan, as originally adopted, became effective
August 30, 1994 and was approved by the Company's stockholders on September 21,
1994. The Plan, as amended and restated as of June 30, 1999, shall be effective
as of such date provided that the Plan is approved by the Company's
stockholders. If such stockholder approval is not obtained within twelve months
after the date of the Plan's amendment and restatement, any Options granted in
respect of shares in excess of the 1,960,000 shares available under the Plan
prior to the Plan's amendment and restatement immediately shall be cancelled and
shall be of no force or effect and, the Plan shall remain in effect as it
existed immediately prior to such amendment and restatement.

      (b) Termination. Unless sooner terminated in accordance with Section 16,
the Plan shall terminate upon the earlier of (i) the close of business on June
29, 2009, or (ii) the date on which all shares available for issuance under the
Plan shall have been issued. If the date of termination is determined under (i)
above, then Options outstanding on such date shall continue to have force and
effect in accordance with the provisions of the instruments evidencing such
Options.

23.   Provision for Foreign Participants.

      The Committee may, without amending the Plan, modify Options granted to
individuals who are foreign nationals or employed outside the United States to
recognize differences in laws, rules, regulations or customs of such foreign
jurisdictions with respect to tax, securities, currency, employee benefit or
other matters.

24.   Expenses and Receipts.

      The expenses of the Plan shall be paid by the Company. Any proceeds
received by the Company in connection with any Option will be used for general
corporate purposes.

25.   Limitations Imposed by Section 162(m) of the Code

      Notwithstanding any other provision hereunder, if and to the extent the
Committee determines the Company's federal tax deduction in respect of a
non-qualified Option may be

                                      -11-
<PAGE>

limited as a result of Section 162(m) of the Code, the Committee may delay the
payment in respect of any such non-qualified Option until a date that is within
30 days after the date that compensation paid to the optionee no longer is
subject to the deduction limitation under Section 162(m) of the Code. In the
event that an optionee exercises a non-qualified Option at a time when the
optionee is a "covered employee" within the meaning of Section 162(m) of the
Code, and the Committee determines to delay the payment in respect of such
non-qualified Option, the Committee shall credit the Fair Market Value of the
Common Stock that otherwise would have been issued to the optionee upon exercise
of the Option to an unfunded account on the books and records of the Company.
The optionee shall have no rights in respect of such account other than as an
unsecured general creditor of the Company, and the amount credited thereto shall
not be transferable by the optionee other than by will or laws of descent and
distribution. The Committee may credit additional amounts to such account as it
may determine in its sole discretion. The amount credited to the account shall
be paid to the optionee if and to the extent (and within 30 days after) the
Committee determines that the Company's federal tax deduction with respect
thereto will not be limited by reason of Section 162(m) of the Code. Any account
created hereunder shall represent only an unfunded unsecured promise by the
Company to pay the amount credited thereto to the optionee in the future.

26.   Governing Law.

      The provisions of this Plan shall be governed and construed in accordance
with the laws of the State of Delaware without regard to the principles of
conflict of laws.

                                      -12-

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