Document:

EXHIBIT 4.1
                                                                     -----------

                            ON TECHNOLOGY CORPORATION

                 1992 EMPLOYEE AND CONSULTANT STOCK OPTION PLAN

                                  July 29, 1992

         1.       Purpose.
                  -------

         The purpose of this plan (the "Plan") is to secure for ON Technology
Corporation (the "Company") and its shareholders the benefits arising from
capital stock ownership by key employees of and consultants to the Company and
its parent and 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 the parent and all subsidiaries of
the Company as defined in Sections 424(e) and 424(f) of the Internal Revenue
Code of 1986, as amended (the "Code").

         2.       Type of Options and Administration.
                  ----------------------------------

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

                  (b) Administration. The Plan will be administered by the Board
of Directors of the Company, whose construction and interpretation of the terms
and provisions of the Plan shall be final and conclusive. The Board of Directors
may in its sole discretion grant options to purchase shares of the Company's
Common Stock and issue shares upon exercise of such options as provided in the
Plan. The Board shall have authority, subject to the express provisions of the
Plan, to construe the respective option agreements and the Plan, to prescribe,
amend and rescind rules and regulations relating to the Plan, to determine the
terms and provisions of the respective option agreements, which need not be
identical, and to make all other determinations in the judgment of the Board of
Directors necessary or desirable for the administration of the Plan. The Board
of Directors 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 director shall be liable for any
action or determination made in good faith. The Board of Directors may, to the
full extent permitted by law, delegate any or all of its powers under the Plan
to a committee (the "Committee") appointed by the Board of Directors, and if the
Committee is so appointed all references to the Board of Directors in the Plan
shall mean and relate to such Committee.

                  (c) Applicability of Rule 16b-3. Those provisions of the Plan
which make express reference to Rule 16b-3 promulgated under the Securities
Exchange Act of 1934 (the "Exchange Act"), or any successor rule ("Rule 16b-3"),
or which are required in order for certain option transactions to qualify for an
exemption under Rule 16b-3, shall apply only to such persons
<PAGE>

as are required to file reports under Section 16(a) of the Exchange Act (a
"Reporting Person").

         3.       Eligibility.
                  -----------

                  (a) Subject to adjustment as provided in Section 15 below, the
maximum number of shares with respect to which options may be granted to any
employee under the Plan shall not exceed 1,000,000 shares of common stock during
the ten-year term of the Plan. For purposes of calculating such maximum number,
(a) an option shall continue to be treated as outstanding notwithstanding its
repricing, cancellation or expiration and (b) the repricing of an outstanding
option or issuance of a new option in substitution for a cancelled option shall
be deemed to constitute the grant of a new additional option separate from the
original grant of the option that is repriced.

                  (b) Incentive Stock Options. Incentive Stock Options shall be
granted only to persons who are, at the time of grant, employees (including
officers and directors who are employees) of the Company. No person shall be
granted any Incentive Stock Option under the Plan who, at the time such option
is granted, owns, directly or indirectly, stock possessing more than 10% of the
total combined voting power of all classes of stock of the Company, unless the
requirements of paragraph (b) of Section 11 are satisfied. The attribution of
stock ownership provisions of Section 424(d) of the Code, and any successor
provisions thereto, shall be applied in determining the shares of stock owned by
a person for purposes of applying the foregoing percentage limitation. A person
who has been granted an option may, if he or she is otherwise eligible, be
granted an additional option or options if the Board of Directors shall so
determine.

                  (c) Nonstatutory Options. Nonstatutory options shall be
granted only to persons who are, at the time of grant, employees (including
officers and directors who are employees) of and consultants to the Company. A
person who has been granted an option may, if he or she is otherwise eligible,
be granted an additional option or options if the Board of Directors shall so
determine.

                  (d) Grant of Options to Officers and Directors. From and after
the registration of the Common Stock of the Company under Section 12 of the
Securities Exchange Act of 1934 (the "Exchange Act"), the selection of an
officer or director as a participant in the plan and the timing, price and
number of shares for which an option or options may be granted to such officer
or director shall be determined either (i) by the Board of Directors, if all of
the directors shall be "disinterested persons" (as hereinafter defined) or (ii)
by, or only in accordance with, the recommendations of a committee of two or
more persons having full authority to act in the matter, of which all members
shall be "disinterested persons." For the purposes of the Plan, a director or
member of such committee shall be deemed to be "disinterested" only if such
person qualifies as a "disinterested person" within the meaning of paragraph
(c)(2) of Rule 16b-3 under the Exchange Act (or any successor rule), as such
term is interpreted from time to time.

                                       -2-
<PAGE>

         4.       Stock Subject to Plan.
                  ---------------------

         Subject to adjustment as provided in Section 15 below, the maximum
number of shares of Common Stock of the Company which may be issued and sold
under the Plan is 5,400,000 shares, which may be issued and sold pursuant to
Incentive Stock Options granted under the Plan or pursuant to non-statutory
options under the Plan. Such shares may be authorized and unissued shares or may
be shares issued and thereafter acquired by the Company. If an option granted
under the Plan shall expire or terminate 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 specified by the Board of Directors. Each option
agreement shall state whether the options granted thereby are Incentive Stock
Options or non-statutory options.

         6.       Purchase Price.
                  --------------

                  (a) General. The purchase price per share of stock deliverable
upon the exercise of an option shall be determined by the Board of Directors,
provided, however, that in the case of an Incentive Stock Option, the exercise
price shall not be less than 100% of the fair market value of such stock, as
determined by the Board of Directors, at the time of grant of such option, or
less than 110% of such fair market value in the case of options described in
paragraph (b) of Section 11.

                  (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, to the extent provided in the applicable option agreement, by
delivery to the Company of shares of Common Stock of the Company already owned
by the optionee having a fair market value equal in amount to the exercise price
of the options being exercised, or by any combination of such methods of
payment. The fair market value of any shares of the Company's Common Stock which
may be delivered upon exercise of an option shall be determined in accordance
with the terms of the applicable option agreement.

         7.       Option Period.
                  -------------

         Each option and all rights thereunder shall expire on such date as the
Board of Directors shall determine, but, in the case of Incentive Stock Options,
in no event after the expiration of ten years from the day on which the option
is granted (or five years in the case of options described in paragraph (b) of
Section 11) and, in the case of non-statutory options, in no event after the
expiration of ten years plus 30 days from the day on which the option is
granted, and in either case, shall be subject to earlier termination as provided
in the Plan.

                                       -3-
<PAGE>

         8.       Exercise of Options.
                  -------------------

         Each option granted under the Plan shall be exercisable either in full
or in installments at such time or times and during such period as shall be set
forth in the agreement evidencing such option, subject to the provisions of
Section 7 above.

         9.       Nontransferability of Options.
                  -----------------------------

         No option granted under the Plan shall be assignable or transferable by
the person to whom it is granted, either voluntarily or by operation of law,
except by will or 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, or the rules thereunder. During the
life of the optionee, the option shall be exercisable only by such person.

         10.      Effect of Termination of Employment.
                  -----------------------------------

         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 if and to the extent the
option agreement or instrument so provides:

                  (a)      the option may be exercised within the period of
                           three months after the date the optionee ceases to be
                           an employee (other than by reason of death or
                           disability) of the Company (other than by reason of
                           death or disability) (or within such lesser period as
                           may be specified in the applicable option agreement);

                  (b)      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 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

                  (c)      if the optionee becomes disabled (within the meaning
                           of Section 22(e)(3) of the Code or any successor
                           provision thereto) while in the employ of the
                           Company, the 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);

provided, however, that in no event may any option be exercised after the
expiration date of the option. For all purposes of the Plan and any option
granted hereunder, "employment" shall be

                                       -4-
<PAGE>

defined in accordance with the provisions of Section 1.421-7(h) of the Income
Tax Regulations (or any successor regulations).

         11.      Incentive Stock Options.
                  -----------------------

         Options granted under the Plan which are intended to be Incentive Stock
Options shall be specifically designated as Incentive Stock Options and shall be
subject to the following additional terms and conditions:

                  (a)      Dollar Limitation. If Incentive Stock Options granted
                           to any employee under the Plan (and any other
                           incentive stock option plans of the Company), 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 (determined as of the
                           respective date or dates of grant) of more than
                           $100,000, then, to the extent required under the
                           Code, the option to acquire such excess shall be
                           treated as a non-statutory option.

                  (b)      10% Shareholder. If any employee to whom an Incentive
                           Stock Option is to be granted under the Plan is, at
                           the time of the grant of such option, the owner of
                           stock possessing more than 10% of the total combined
                           voting power of all classes of stock of the Company
                           (after taking into account the attribution of stock
                           ownership rules of Section 424(d) of the Code), then,
                           to the extent required under the Code, the option
                           shall be treated as a non-statutory option unless the
                           following special provisions are applicable to the
                           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 from the date of grant.

         12.      Additional Provisions.
                  ---------------------

                  (a) Additional Option Provisions. The Board of Directors may,
in its sole discretion, include additional provisions in any option granted
under the Plan, including without limitation restrictions on transfer,
repurchase rights, commitments to pay cash bonuses, make or arrange for loans or
transfer other property to optionees upon exercise of options, or such other
provisions as shall be determined by the Board of Directors; provided that such
additional provisions shall not be inconsistent with any other term or condition
of the Plan and such additional provisions shall not 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.

                                       -5-
<PAGE>

                  (b) Acceleration. The Board of Directors may, in its sole
discretion, accelerate the date or dates on which all or any particular option
or options granted under the Plan may be exercised.

         13.      General Restrictions.
                  --------------------

                  (a) Investment Representations. The Company may require 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 such other effects as the
Company deems necessary or appropriate in order to comply with federal and
applicable state securities laws.

                  (b) Compliance With Securities Laws. 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, is necessary
as a condition of, or in connection with, the issuance or purchase of shares
thereunder, such option may not be exercised, in whole or in part, unless such
listing, registration, qualification, consent or approval 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.

         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 until the date of issue of a stock
certificate to him or her for such shares. Except as provided below in Section
15, 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.      Adjustments.
                  -----------

                  (a) General. If, as a result of a merger, consolidation, sale
of all or substantially all of the assets of the Company, reorganization,
recapitalization, reclassification, stock dividend, stock split, reverse stock
split or other distribution with respect to the outstanding shares of Common
Stock or other securities, the outstanding shares of Common Stock are increased
or decreased, or are exchanged for a different number or kind of shares or other
securities, or additional shares or new or different shares or other securities
are distributed with respect to such shares of Common Stock or other securities,
an appropriate and proportionate adjustment may be made in (i) the maximum
number and kind of shares reserved for issuance under the Plan, (ii) the number
and kind of shares or other securities subject to then outstanding options under
the Plan,
                                       -6-
<PAGE>

and (iii) the price for each share subject to any then outstanding options under
the Plan, without changing the aggregate purchase price as to which such options
remain exercisable.

                  (b) Board Authority to Make Adjustments. Adjustments under
this Section 15 will be made by the Board of Directors, 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.      Reorganization.
                  ---------------

                  (a) General. In the event of a consolidation or merger in
which the Company is not the surviving corporation, or which results in the
acquisition of substantially all of the Company's outstanding Common Stock by a
single person, entity or group of persons or entities acting in concert, or in
the event of the sale or transfer of all or substantially all of the assets of
the Company, or in the event of a reorganization or liquidation of the Company,
the Board of Directors of the Company, or the board of directors of any
corporation assuming the obligations of the Company, shall, as to outstanding
options, either (i) provide that such options shall be assumed, or equivalent
options shall be substituted, by the acquiring or succeeding corporation (or an
affiliate thereof), provided that any such options substituted for Incentive
Stock Options shall meet the requirements of Section 424(a) of the Code, (ii)
upon written notice to the optionees, provide that all unexercised options will
terminate immediately prior to the consummation of such merger, consolidation,
acquisition, reorganization, liquidation, sale or transfer unless exercised by
the optionee within a specified number of days following the date of such
notice, or (iii) in the event of a merger under the terms of which holders of
the Common Stock of the Company will receive upon consummation thereof a cash
payment for each share surrendered in the merger (the "Merger Price"), make or
provide for a cash payment to the optionees equal to the difference between (A)
the Merger Price times the number of shares of Common Stock subject to such
outstanding options (to the extent exercisable) and (B) the aggregate exercise
price of all such outstanding options in exchange for the termination of such
options. In any such case, the Board of Directors may, in its discretion,
advance the lapse of any waiting or installment periods and exercise dates.

                  (b) Substitute Options. The Company may grant options under
the Plan in substitution for options held by employees of another corporation
who become employees of the Company, or a subsidiary of the Company, as the
result of a merger or consolidation of the employing corporation with the
Company or a subsidiary of the Company, or 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 Board of Directors considers appropriate in the
circumstances.

         17.      No Special Employment Rights.
                  ----------------------------

         Nothing contained in the Plan or in any option shall confer upon any
optionee any right with respect to the continuation of his or her employment by
the Company or interfere in any way with

                                       -7-
<PAGE>

the right of the Company at any time to terminate such employment or to increase
or decrease the compensation of the optionee. Whether an authorized leave of
absence, or absence in military or government service, shall constitute
termination of employment shall be determined at the time of such absence in
accordance with the provisions of Section 1.421-7(h) of the Income Tax
Regulations (or any successor regulations).

         18.      Other Employee Benefits.
                  -----------------------

         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.
                  ---------------------

         The Board of Directors may at any time, and from time to time, modify
or amend the Plan in any respect, except that if at any time the approval of the
shareholders of the Company is required under Section 422 of the Code or any
successor provision with respect to Incentive Stock Options, or under Rule
16b-3, the Board of Directors may not effect such modification or amendment
without such approval. The termination or any modification or amendment of the
Plan shall not, without the consent of an optionee, affect his or her rights
under an option previously granted to him or her. With the consent of the
optionee affected, the Board of Directors may amend outstanding option
agreements in a manner not inconsistent with the Plan. The Board of Directors
shall have the right to amend or modify (i) 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 (ii) the
terms and provisions of the Plan and of any outstanding option to the extent
necessary to ensure the qualification of the Plan under Rule 16b-3.

         20.      Withholding.
                  -----------

                  (a) The Company shall have the right to deduct from payments
of any kind otherwise due to the optionee 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 under the Plan. Subject to the prior approval of the
Company, which may be withheld by the Company 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, (ii) by delivering to the Company shares
of Common Stock already owned by the optionee, or (iii) by delivering cash. The
shares so delivered or withheld shall have a fair market value equal to such
withholding obligation. The fair market value of the shares used to satisfy such
withholding obligation shall be determined by the Company as of the date that
the amount of tax to be withheld

                                       -8-
<PAGE>

is to be determined. An optionee who has made an election pursuant to this
Section 20(a) may only satisfy his or her withholding obligation with shares of
Common Stock which are not subject to any repurchase, forfeiture, unfulfilled
vesting or other similar requirements.

                  (b) Notwithstanding the foregoing, in the case of an optionee
subject to the reporting requirements of Section 16(a) of the Exchange Act, no
election to use shares for the payment of withholding taxes shall be effective
unless made in compliance with any applicable requirements of Rule 16b-3(e) or
any successor rule under such Act.

         21.      Cancellation and New Grant of Options.
                  -------------------------------------

         The Board of Directors shall have the authority to effect, at any time
and from time to time, with the consent of the affected optionees, the
cancellation of any or all outstanding options under the Plan and the grant in
substitution therefor of new options under the Plan covering the same or
different numbers of shares of Common Stock having an option exercise price per
share which may be lower or higher than the exercise price per share of the
cancelled options.

         22.      Effective Date and Duration of the Plan.
                  ---------------------------------------

                  (a) Effective Date. The Plan shall become effective when
adopted by the Board of Directors, but no Incentive Stock Option granted under
the Plan shall become exercisable unless and until the Plan shall have been
approved by the Company's shareholders. If such shareholder approval is not
obtained within twelve months before or after the date of the Board's adoption
of the Plan, any Incentive Stock Options previously granted under the Plan shall
terminate and no further Incentive Stock Options shall be granted. Amendments to
the Plan not requiring shareholder approval shall become effective when adopted
by the Board of Directors; amendments requiring shareholder approval (as
provided in Section 19) shall become effective when adopted by the Board of
Directors, but no Incentive Stock Option issued after the date of such amendment
shall become exercisable (to the extent that such amendment to the Plan was
required to enable the Company to grant such Incentive Stock Option to a
particular optionee) unless and until such amendment shall have been approved by
the Company's shareholders. If such shareholder approval is not obtained within
twelve months of the Board's adoption of such amendment, any Incentive Stock
Options granted on or after the date of such amendment shall terminate to the
extent that such amendment to the Plan was required to enable the Company to
grant such option to a particular optionee. Subject to this limitation, options
may be granted under the Plan at any time after the effective date and before
the date fixed for termination of the Plan.

                  (b) Termination. The Plan shall terminate upon the earlier of
(i) the close of business on the day next preceding the tenth anniversary of the
date of its adoption by the Board of Directors (or approval by shareholders, if
earlier), or (ii) the date on which all shares available for issuance under the
Plan shall have been issued pursuant to the exercise or cancellation of options
granted under the Plan. If the date of termination is determined under (i)
above, then options

                                       -9-
<PAGE>

outstanding on such date shall continue to have force and effect in accordance
with the provisions of the instruments evidencing such options.

         Adopted by the Board of Directors on July 29, 1992

         Amended by the Board of Directors on May 6, 1994

         Amended by the Board of Directors on May 18, 1995.

         Amended by the Board of Directors on April 30, 1996.

         Amended by the Board of Directors on April 30, 1997.

         Amended by the Board of Directors on April 30, 1998.

         Amended by the Board of Directors on January 28, 2000.

                                      -10-
<PAGE>
                            ON TECHNOLOGY CORPORATION

                        INCENTIVE STOCK OPTION AGREEMENT

         1. Grant of Option. ON Technology Corporation, a Delaware corporation
(the "Company"), hereby grants to (the "Employee"), an option, pursuant to the
Company's 1992 Employee and Consultant Stock Option Plan (the "Plan"), to
purchase an aggregate of shares of Common Stock, $0.01 par value ("Common
Stock"), of the Company at a price of $ per share, purchasable as set forth in
and subject to the terms and conditions of this option and the Plan. Except
where the context otherwise requires, the term "Company" shall include the
parent and all subsidiaries of the Company as defined in Sections 424(e) and
424(f) of the Internal Revenue Code of 1986, as amended (the "Code").

         2. Incentive Stock Option. This option is intended to qualify as an
incentive stock option ("Incentive Stock Option") within the meaning of Section
422 of the Code.

         3. Exercise of Option and Provisions for Termination.

                  (a) Vesting Schedule. Except as otherwise provided in this
Agreement, this option may be exercised prior to the tenth anniversary of the
date of grant (or five years in the case of an option described in paragraph (b)
of Section 11 of the Plan) (hereinafter the "Expiration Date") in installments
as to not more than the number of shares and during the respective installment
periods set forth in the table below. The right of exercise shall be cumulative
so that if the option is not exercised to the maximum extent permissible during
any exercise period it shall be exercisable, in whole or in part, with respect
to all shares not so purchased at any time prior to the Expiration Date or the
earlier termination of this option.

                                                            Number of
                  Exercise Period                      Shares Exercisable
                  ---------------                      ------------------

                  Prior to             , 20                    -0-
                           ------------    --

                  On or after          , 20
                              ---------    --
                  but prior to         , 20
                               --------    --                   --

                  On or after          , 20
                              ---------    --
                  but prior to         , 20
                               --------    --                   --

                  On or after          , 20
                              ---------    --
                  but prior to         , 20
                               --------    --                   --

                  On or after          , 20
                              ---------    --                   --

This option may not be exercised at any time on or after the Expiration Date.

                                      -11-
<PAGE>

                  (b) Exercise Procedure. Subject to the conditions set forth in
this Agreement, this option shall be exercised by the Employee's delivery of
written notice of exercise to the Treasurer of the Company, specifying the
number of shares to be purchased and the purchase price to be paid therefor and
accompanied by payment in full in accordance with Section 4. Such exercise shall
be effective upon receipt by the Treasurer of the Company of such written notice
together with the required payment. The Employee may purchase less than the
number of shares covered hereby, provided that no partial exercise of this
option may be for any fractional share or for fewer than ten whole shares.

                  (c) Except as otherwise provided in this Section 3, this
option may not be exercised unless the Employee, at the time he or she exercises
this option, is, and has been at all times since the date of grant of this
option, an employee of the Company. For all purposes of this option, (i)
"employment" shall be defined in accordance with the provisions of Section
1.421-7(h) of the Income Tax Regulations or any successor regulations, and (ii)
if this option shall be assumed or a new option substituted therefor in a
transaction to which Section 424(a) of the Code applies, employment by such
assuming or substituting corporation (hereinafter called the "Successor
Corporation") shall be considered for all purposes of this option to be
employment by the Company.

                  (d) Exercise Period Upon Termination of Employment. If the
Employee ceases to be employed by the Company for any reason other than death or
disability or a discharge for "cause," as provided below, the right to exercise
this option shall terminate three months after such cessation (but in no event
after the Expiration Date), provided that this option shall be exercisable only
to the extent that the Employee was entitled to exercise this option on the date
of such cessation.

                  (e) Exercise Period Upon Death or Disability. If the Employee
dies or becomes disabled (within the meaning of Section 22(e)(3) of the Code or
any successor provision thereto) prior to the Expiration Date while he or she is
an employee of the Company, or if the Employee dies within three months after
the Employee ceases to be an employee of the Company (other than as the result
of a discharge for "cause" as specified in paragraph (f) below), this option
shall be exercisable, within the period of one year following the date of death
or disability of the Employee (but in no event after the Expiration Date), by
the Employee or by the person to whom this option is transferred by will or 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, or the rules thereunder, provided that this option shall be
exercisable only to the extent that this option was exercisable by the Employee
on the date of his or her death or disability. Except as otherwise indicated by
the context, the term "Employee," as used in this option, shall be deemed to
include the estate of the Employee or any person who acquires the right to
exercise this option by bequest or inheritance or otherwise by reason of the
death of the Employee or pursuant to a qualified domestic relations order (as
defined in the Code) or Title I of the Employee Retirement Income Security Act,
or the rules thereunder.

                                      -12-
<PAGE>

                  (f) Discharge for Cause. If the Employee, prior to the
Expiration Date, ceases his or her employment with the Company because he or she
is discharged for "cause" (as defined below), the right to exercise this option
shall terminate immediately upon such cessation of employment. "Cause" shall
mean willful misconduct in connection with the Employee's employment or willful
failure to perform his or her employment responsibilities in the best interests
of the Company (including, without limitation, breach by the Employee of any
provision of any employment, nondisclosure, non-competition or other similar
agreement between the Employee and the Company), as determined by the Company,
which determination shall be conclusive.

         4.       Payment of Purchase Price.
                  -------------------------

                  (a) Method of Payment. Payment of the purchase price for
shares purchased upon exercise of this option shall be made by delivery to the
Company of cash or a check to the order of the Company in an amount equal to the
purchase price of such shares, or by delivery to the Company of shares of Common
Stock of the Company then owned by the Employee having a fair market value equal
in amount to the purchase price of such shares, or by any combination of such
methods of payment.

                  (b) Valuation of Shares Tendered in Payment of Purchase Price.
For the purposes hereof, the fair market value of any share of the Company's
Common Stock which may be delivered to the Company in exercise of this option
shall be determined in good faith by the Board of Directors of the Company.

                  (c) Delivery of Shares Tendered in Payment of Purchase Price.
If the Employee exercises options by delivery of shares of Common Stock of the
Company, the certificate or certificates representing the shares of Common Stock
of the Company to be delivered shall be duly executed in blank by the Employee
or shall be accompanied by a stock power duly executed in blank suitable for
purposes of transferring such shares to the Company. Fractional shares of Common
Stock of the Company will not be accepted in payment of the purchase price of
shares acquired upon exercise of this option.

                  (d) Restrictions on Use of Option Stock. Notwithstanding the
foregoing, no shares of Common Stock of the Company may be tendered in payment
of the purchase price of shares purchased upon exercise of this option if the
shares to be so tendered were acquired within twelve (12) months before the date
of such tender, through the exercise of an option granted under the Plan or any
other stock option or restricted stock plan of the Company.

         5. Delivery of Shares; Compliance With Securities Laws, Etc. The
Company shall, upon payment of the option price for the number of shares
purchased and paid for, make prompt delivery of such shares to the Employee,
provided that if any law or regulation requires the Company to take any action
with respect to such shares before the issuance thereof, then the date of
delivery of such shares shall be extended for the period necessary to complete
such action.

                                      -13-
<PAGE>

         6. Nontransferability of Option. Except as provided in paragraph (e) of
Section 3, this option is personal and no rights granted hereunder may be
transferred, assigned, pledged or hypothecated in any way (whether by operation
of law or otherwise) nor shall any such rights be subject to execution,
attachment or similar process. Upon any attempt to transfer, assign, pledge,
hypothecate or otherwise dispose of this option or of such rights contrary to
the provisions hereof, or upon the levy of any attachment or similar process
upon this option or such rights, this option and such rights shall, at the
election of the Company, become null and void.

         7. No Special Employment Rights. Nothing contained in the Plan or this
option shall be construed or deemed by any person under any circumstances to
bind the Company to continue the employment of the Employee for the period
within which this option may be exercised. However, during the period of the
Employee's employment, the Employee shall render diligently and faithfully the
services which are assigned to the Employee from time to time by the Board of
Directors or by the executive officers of the Company and shall at no time take
any action which, directly or indirectly, would be inconsistent with the best
interests of the Company.

         8. Rights as a Shareholder. The Employee shall have no rights as a
shareholder with respect to any shares which may be purchased by exercise of
this option unless and until a certificate representing such shares is duly
issued and delivered to the Employee. 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.

         9.       Adjustments.
                  -----------

                  (a) General. If, as a result of a merger, consolidation, sale
of all or substantially all of the assets of the Company, reorganization,
recapitalization, reclassification, stock dividend, stock split, reverse stock
split or other distribution with respect to the outstanding shares of Common
Stock or other securities, the outstanding shares of Common Stock are increased
or decreased, or are exchanged for a different number or kind of shares or other
securities, or additional shares or new or different shares or other securities
are distributed with respect to such shares of Common Stock or other securities,
an appropriate and proportionate adjustment may be made in (i) the number and
kind of shares or other securities subject to this option and (ii) the price for
each share subject to this option, without changing the aggregate purchase price
as to which this option remains exercisable.

                  (b) Board Authority to Make Adjustments. Adjustments under
this Section 9 will be made by the Board of Directors, 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 pursuant to this
option on account of any such adjustments.

                  (c) Limits on Adjustments. No adjustment shall be made under
this Section 9 which would, within the meaning of any applicable provision of
the Code, constitute a

                                      -14-
<PAGE>

modification, extension or renewal of this option or a grant of additional
benefits to the Employee.

         10.      Mergers, Etc.
                  -------------

                  (a) General. In the event of a consolidation or merger in
which the Company is not the surviving corporation, or which results in the
acquisition of substantially all of the Company's outstanding Common Stock by a
single person, entity or group of persons or entities acting in concert, or in
the event of the sale or transfer of all or substantially all of the assets of
the Company, or in the event of a reorganization or liquidation of the Company,
prior to the Expiration Date or termination of this option (each, an "Organic
Event"), the Employee shall, with respect to this option or any unexercised
portion hereof, be entitled to the rights and benefits, and be subject to the
limitations, set forth in Section 16 of the Plan.

                  (b) Acceleration. In the event of the occurrence of an Organic
Event after the first anniversary of the date hereof, the vesting schedule set
forth in Section 3(a) of this Agreement shall be accelerated by 24 months, so
that this option shall be exercisable with respect to that number of shares
which would have been exercisable 24 months after the occurrence of such Organic
Event, but for the occurrence of such Organic Event.

         11. Withholding Taxes. The Company's obligation to deliver shares upon
the exercise of this option shall be subject to the Employee's satisfaction of
all applicable federal, state and local income and employment tax withholding
requirements.

         12. Limitations on Disposition of Incentive Stock Option Shares. It is
understood and intended that this option shall qualify as an "incentive stock
option" as defined in Section 422 of the Code. Accordingly, the Employee
understands that in order to obtain the benefits of an incentive stock option
under Section 421 of the Code, no sale or other disposition may be made of any
shares acquired upon exercise of the option within one year after the day of the
transfer of such shares to him, nor within two years after the grant of the
option. If the Employee intends to dispose, or does dispose (whether by sale,
exchange, gift, transfer or otherwise), of any such shares within said periods,
he or she will notify the Company in writing within ten days after such
disposition.

         13.      Miscellaneous.
                  -------------

                  (a) Except as provided herein, this option may not be amended
or otherwise modified unless evidenced in writing and signed by the Company and
the Employee.

                  (b) All notices under this option shall be mailed or delivered
by hand to the parties at their respective addresses set forth beneath their
names below or at such other address as may be designated in writing by either
of the parties to one another.

                  (c) This option shall be governed by and construed in
accordance with the laws of the Commonwealth of Massachusetts.

                                      -15-
<PAGE>

Date of Grant:                             ON TECHNOLOGY CORPORATION

_______, 200_                              By:______________________

                                           Title:___________________

                                           Address:_________________

                                      -16-
<PAGE>

                              EMPLOYEE'S ACCEPTANCE

         The undersigned hereby accepts the foregoing option and agrees to the
terms and conditions thereof. The undersigned hereby acknowledges receipt of a
copy of the Company's 1992 Employee and Consultant Stock Option Plan.

                                            EMPLOYEE

                                            ______________________

                                            Address:______________

                                            ______________________

                                      -17-
<PAGE>

                            ON TECHNOLOGY CORPORATION

                       NONSTATUTORY STOCK OPTION AGREEMENT

         1.   Grant of Option. ON Technology Corporation, a Delaware corporation
(the "Company"), hereby grants to (the "Optionee") an option, pursuant to the
Company's 1992 Employee and Consultant Stock Option Plan (the "Plan"), to
purchase an aggregate of shares of Common Stock, $0.01 par value ("Common
Stock"), of the Company at a price of $ per share, purchasable as set forth in,
and subject to the terms and conditions of, this option and the Plan. This
option is not intended to qualify as an incentive stock option within the
meaning of Section 422 of the Internal Revenue Code of 1986, as amended (the
"Code"). Except where the context otherwise requires, the term "Company" shall
include the parent and all subsidiaries of the Company as defined in Sections
424(e) and 424(f) of the Code.

         2.       Exercise of Option and Provisions for Termination.
                  -------------------------------------------------

                  (a) Vesting Schedule. Except as otherwise provided in this
Agreement, this option may be exercised prior to the date 30 days after the
tenth anniversary of the date of grant (hereinafter the "Expiration Date") in
installments as to not more than the number of shares and during the respective
installment periods set forth in the table below. The right of exercise shall be
cumulative so that if the option is not exercised to the maximum extent
permissible during any exercise period it shall be exercisable, in whole or in
part, with respect to all shares not so purchased at any time prior to the
Expiration Date or the earlier termination of this option.

                                                          Total No. of
                  Exercise Period                      Shares Exercisable
                  ---------------                      ------------------

                  Prior to             , 20                    -0-
                           ------------    --

                  On or after          , 20
                              ---------    --
                  but prior to         , 20
                               --------    --                   --

                  On or after          , 20
                              ---------    --
                  but prior to         , 20
                               --------    --                   --

                  On or after          , 20
                              ---------    --
                  but prior to         , 20
                               --------    --                   --

                  On or after          , 20
                              ---------    --                   --

                                      -18-
<PAGE>

This option may not be exercised at any time on or after the Expiration Date.

                  (b) Exercise Procedure. Subject to the conditions set forth in
this Agreement, this option shall be exercised by the Optionee's delivery of
written notice of exercise to the Treasurer of the Company specifying the number
of shares to be purchased and the purchase price to be paid therefor and
accompanied by payment in full in accordance with Section 3. Such exercise shall
be effective upon receipt by the Treasurer of the Company of such written notice
together with the required payment. The Optionee may purchase fewer than the
total number of shares covered hereby, provided that no partial exercise of this
option may be for any fractional share or for fewer than ten whole shares.

                  (c) Continuous Employment Required. Except as otherwise
provided in this Section 2, this option may not be exercised unless the
Optionee, at the time he or she exercises this option, is, and has been at all
times since the date of grant of this option, an employee of the Company or, in
the case of an Optionee who is a consultant to the Company, unless the
consulting relationship is not interrupted or terminated by the Company. For all
purposes of this option, (i) "employment" shall be defined in accordance with
the provisions of Section 1.421-7(h) of the Income Tax Regulations or any
successor regulations, and (ii) if this option shall be assumed or a new option
substituted therefor in a transaction to which Section 424(a) of the Code,
applies, employment by such assuming or substituting corporation (hereinafter
called the "Successor Corporation") shall be considered for all purposes of this
option to be employment by the Company.

                  (d) Termination of Employment. If the Optionee ceases to be
employed by the Company or if the Optionee's consulting relationship is
interrupted or terminated by the Company for any reason other than death or
disability or a discharge for "cause," as provided below, the right to exercise
this option shall terminate three months after such cessation (but in no event
after the Expiration Date), provided that this option shall be exercisable only
to the extent that the Optionee was entitled to exercise this option on the date
of such cessation.

                  (e) Exercise Period Upon Death or Disability. If the Optionee
dies or becomes disabled (within the meaning of Section 22(e)(3) of the Code or
any successor provision thereto) prior to the Expiration Date, while he or she
is an employee of or consultant to the Company, or if the Optionee dies within
three months after the Optionee ceases to be an employee of or consultant to the
Company (other than as the result of a discharge for "cause" or termination of a
consulting relationship for "cause", in each case as specified in paragraph (f)
below), this option shall be exercisable, within the period of one year
following the date of death or disability of the Optionee (but in no event after
the Expiration Date), by the Optionee or by the person to whom this option is
transferred by will or 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, or the rules thereunder, provided that
this option shall be exercisable only to the extent that this option was
exercisable by the Optionee on the date of his or her death or disability.
Except as

                                      -19-
<PAGE>

otherwise indicated by the context, the term "Optionee," as used in this option,
shall be deemed to include the estate of the Optionee or any person who acquires
the right to exercise this option by bequest or inheritance or otherwise by
reason of the death of the Optionee or pursuant to a qualified domestic
relations order (as defined in the Code) or Title I of the Employee Retirement
Income Security Act, or the rules thereunder.

                  (f) Discharge for Cause. If the Optionee, prior to the
Expiration Date, ceases his or her employment or consulting relationship with
the Company because he or she is discharged or terminated for "cause" (as
defined below), the right to exercise this option shall terminate immediately
upon such cessation of employment. "Cause" shall mean willful misconduct in
connection with the Optionee's employment or consulting relationship or willful
failure to perform his or her employment or consulting responsibilities in the
best interests of the Company (including, without limitation, breach by the
Optionee of any provision of any employment, nondisclosure, non-competition or
other similar agreement between the Optionee and the Company), as determined by
the Company, which determination shall be conclusive.]

         3.       Payment of Purchase Price.
                  -------------------------

                  (a) Method of Payment. Payment of the purchase price for
shares purchased upon exercise of this option shall be made by delivery to the
Company of cash or a check to the order of the Company in an amount equal to the
purchase price of such shares, or by delivery to the Company of shares of Common
Stock of the Company then owned by the Optionee having a fair market value equal
in amount to the purchase price of such shares, or by any combination of such
methods of payment.

                  (b) Valuation of Shares Tendered in Payment of Purchase Price.
For the purposes hereof, the fair market value of any share of the Company's
Common Stock which may be delivered to the Company in exercise of this option
shall be determined in good faith by the Board of Directors of the Company.

                  (c) Delivery of Shares Tendered in Payment of Purchase Price.
If the Company permits the Optionee to exercise options by delivery of shares of
Common Stock of the Company, the certificate or certificates representing the
shares of Common Stock of the Company to be delivered shall be duly executed in
blank by the Optionee or shall be accompanied by a stock power duly executed in
blank suitable for purposes of transferring such shares to the Company.
Fractional shares of Common Stock of the Company will not be accepted in payment
of the purchase price of shares acquired upon exercise of this option.

                  (d) Restrictions Upon Use of Option Stock. Notwithstanding the
foregoing, no shares of Common Stock of the Company may be tendered in payment
of the purchase price of shares purchased upon exercise of this option if the
shares to be so tendered were acquired within twelve (12) months before the date
of such tender, through the exercise of an option granted under the Plan or any
other stock option or restricted stock plan of the Company.

                                      -20-
<PAGE>

         4. Delivery of Shares; Compliance With Securities Law, Etc. The Company
shall, upon payment of the option price for the number of shares purchased and
paid for, make prompt delivery of such shares to the Optionee, provided that if
any law or regulation requires the Company to take any action with respect to
such shares before the issuance thereof, then the date of delivery of such
shares shall be extended for the period necessary to complete such action.

         5. Nontransferability of Option. Except as provided in paragraph (e) of
Section 2, this option is personal and no rights granted hereunder may be
transferred, assigned, pledged or hypothecated in any way (whether by operation
of law or otherwise) nor shall any such rights be subject to execution,
attachment or similar process. Upon any attempt to transfer, assign, pledge,
hypothecate or otherwise dispose of this option or of such rights contrary to
the provisions hereof, or upon the levy of any attachment or similar process
upon this option or such rights, this option and such rights shall, at the
election of the Company, become null and void.

         6. No Special Employment Or Consulting Rights. Nothing contained in the
Plan or this option shall be construed or deemed by any person under any
circumstances to bind the Company to continue the employment of the Optionee or
the continuation of the consulting relationship with the Optionee for the period
within which this option may be exercised. However, during the period of the
Optionee's employment or consulting relationship, the Optionee shall render
diligently and faithfully the services which are assigned from time to time by
the Board of Directors or by the executive officers of the Company and shall at
no time take any action which directly or indirectly would be inconsistent with
the best interests of the Company.

         7. Rights as a Shareholder. The Optionee shall have no rights as a
shareholder with respect to any shares which may be purchased by exercise of
this option unless and until a certificate representing such shares is duly
issued and delivered to the Optionee. 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.

         8.       Recapitalization.
                  ----------------

                  (a) General. If, as a result of a merger, consolidation, sale
of all or substantially all of the assets of the Company, reorganization,
recapitalization, reclassification, stock dividend, stock split, reverse stock
split or other distribution with respect to the outstanding shares of Common
Stock or other securities, the outstanding shares of Common Stock are increased
or decreased, or are exchanged for a different number or kind of shares or other
securities, or if additional shares or new or different shares or other
securities are distributed with respect to such shares of Common Stock or other
securities, an appropriate and proportionate adjustment may be made in (i) the
number and kind of shares or other securities subject to this option and (ii)
the price for each share subject to this option, without changing the aggregate
purchase price as to which this option remains exercisable.

                                      -21-
<PAGE>

                  (b) Board Authority to Make Adjustments. Adjustments under
this Section 8 will be made by the Board of Directors, 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 this option on
account of any such adjustments.

         9.       Mergers, Etc.
                  ------------

                  (a) General. In the event of a consolidation or merger in
which the Company is not the surviving corporation, or which results in the
acquisition of substantially all of the Company's outstanding Common Stock by a
single person, entity or group of persons or entities acting in concert, or in
the event of the sale or transfer of all or substantially all of the assets of
the Company, or in the event of a reorganization or liquidation of the Company,
prior to the Expiration Date or termination of this option (each, an "Organic
Event"), the Optionee shall, with respect to this option or any unexercised
portion hereof, be entitled to the rights and benefits, and be subject to the
limitations, set forth in Section 16 of the Plan.

                  (b) Acceleration. In the event of the occurrence of an Organic
Event after the first anniversary of the date hereof, the vesting schedule set
forth in Section 3(a) of this Agreement shall be accelerated by 24 months, so
that this option shall be exercisable with respect to that number of shares
which would have been exercisable 24 months after the occurrence of such Organic
Event, but for the occurrence of such Organic Event.

         10.  Withholding Taxes. The Company's obligation to deliver shares upon
the exercise of this option shall be subject to the Optionee's satisfaction of
all applicable federal, state and local income and employment tax withholding
requirements.

         11.  Miscellaneous.
              -------------

                  (a) Except as provided herein, this option may not be amended
or otherwise modified unless evidenced in writing and signed by the Company and
the Optionee.

                  (b) All notices under this option shall be mailed or delivered
by hand to the parties at their respective addresses set forth beneath their
names below or at such other address as may be designated in writing by either
of the parties to one another.

                  (c) This option shall be governed by and construed in
accordance with the laws of the Commonwealth of Massachusetts.

Date of Grant:                             ON TECHNOLOGY CORPORATION

_______, 200_                              By:______________________

                                           Title:___________________

                                           Address:_________________

                                      -22-
<PAGE>

                              OPTIONEE'S ACCEPTANCE

         The undersigned hereby accepts the foregoing option and agrees to the
terms and conditions thereof. The undersigned hereby acknowledges receipt of a
copy of the Company's 1992 Employee and Consultant Stock Option Plan.

                                            OPTIONEE

                                            ______________________

                                            ADDRESS:______________

                                            ______________________

                                      -23-<PAGE>   1

                                                                   EXHIBIT 10.47

                        SEVERANCE COMPENSATION AGREEMENT
                          DATED AS OF OCTOBER 29, 1999
                                     BETWEEN
               DATUM INC., A DELAWARE CORPORATION, (THE "COMPANY")
                                       AND
                     ERIK H. VAN DER KAAY (THE "EXECUTIVE")

         The Company's Board of Directors (the "Board") has determined that it
is appropriate to reinforce and encourage the continued attention and dedication
of members of the Company's management, including the Executive, to their
assigned duties without distraction in potentially disturbing circumstances
arising from the possibility of a change in control of the Company.

         This Agreement sets forth the severance compensation which the Company
agrees it will pay to the Executive if the Executive's employment with the
Company terminates under one of the circumstances described herein following a
"Change in Control" of the Company (as defined in Section 2).

         1. Term. The term ("Term") of this Agreement shall commence on the date
hereof and, subject to earlier termination pursuant to Section 3(b), 3(c) or
3(d) hereof, shall end three (3) years following the date on which notice of
non-renewal or termination of this Agreement is given by either the Company or
Executive to the other. Thus, this Agreement shall be renewable automatically on
a daily basis so that the outstanding Term is always three (3) years following
any effective notice of non-renewal or of termination given by the Company or
Executive.

         2. Change in Control. No compensation shall be payable under this
Agreement unless and until (a) there has been a Change in Control of the Company
while the Executive is still an employee of the Company and (b) the Executive's
employment by the Company terminates in the circumstances specified in Section
3(a). For purposes of this Agreement, a "Change in Control" of the Company shall
be deemed to have occurred if (i) there shall be consummated (x) any
consolidation or merger of the Company in which the Company is not the
continuing or surviving corporation or pursuant to which shares of the Company's
Common Stock would be converted into cash, securities or other property, other
than a consolidation or merger of the Company in which the holders of the
Company's Common Stock immediately prior to the consolidation or merger have
substantially the same proportionate ownership of at least 65% of common stock
of the surviving corporation immediately after the consolidation or merger, or
(y) any sale, lease, exchange or other transfer (in one transaction or a series
of related transactions) of all, or substantially all, of the assets of the
Company other than to a corporation in which the holders of the Company's Common
Stock immediately prior to such transaction have substantially the same
proportionate ownership of at least 65% of the common stock of such corporation,
or (ii) the stockholders of the Company approve any plan or proposal for the
liquidation or dissolution of the Company, or (iii) any person (as such term is
used in Sections 13(d) and 14(d)(2) of the Securities Exchange Act of 1934, as
amended (the "Exchange Act")), shall become the beneficial owner (within the
meaning of Rule 13d-3 under the Exchange Act) of more than 35% of the Company's
outstanding shares of Common Stock, or (iv) during any period of two consecutive
years during the term of this Agreement, individuals who at the beginning of the
two year period constituted the entire Board do not for any reason constitute a
majority thereof unless the election, or the nomination for election by the
Company's stockholders,

<PAGE>   2

of each new director was approved by a vote of at least five-eighths of the
directors then still in office who were directors at the beginning of the
period.

         3. Termination Following Change in Control.

               (a) Termination. If a Change in Control of the Company shall have
occurred while the Executive is still an employee of the Company, the Executive
shall be entitled to the compensation provided in Section 4 upon the subsequent
termination of the Executive's employment with the Company within twenty four
(24) months of such Change in Control, whether requested by the Executive or by
the Company, unless such termination is as a result of (i) the Executive's
death; (ii) the Executive's Disability (as defined in Section (3)(b) below);
(iii) the Executive's Retirement (as defined in Section 3(c) below); (iv) the
Executive's termination by the Company for Cause (as defined in Section 3(d)
below); or (v) the Executive's decision to terminate employment other than for
Good Reason (as defined in Section 3(e) below).

               (b) Death or Disability. If, as a result of the Executive's
incapacity due to physical or mental illness, the Executive is absent from his
duties with the Company on a full-time basis for six months, the Company may
elect to terminate the Executive for "Disability" by written notice to Executive
and without liability to Executive pursuant to this Agreement; provided,
however, that any such termination shall be effective only at the end of thirty
(30) days following the delivery of such notice and only if Executive fails to
return to the full-time performance of duties by the end of such 30-day notice
period. In addition, this Agreement shall terminate immediately in the event of
the death of the Executive occurring at any time during the Term hereof, and in
such event the Company shall have no liability by reason of such termination.

               (c) Retirement. The Executive shall be deemed terminated
automatically, without liability to Executive pursuant to this Agreement, upon
Retirement (as hereinafter defined) of Executive without liability to the
Company pursuant to this Agreement. "Retirement" as used in this Agreement shall
be deemed to occur upon the Executive's having reached such age as shall have
been fixed in any arrangement mutually established by the Company and the
Executive.

               (d) Cause. The Company may terminate the Executive, without
liability to the Executive pursuant to this Agreement, if the Executive's
employment with the Company is terminated for Cause. For purposes solely of
determining whether the Company may terminate the Executive pursuant to this
Section 3(d) without liability to the Executive, the Executive shall be deemed
to have been terminated for "Cause" only if Executive had engaged in fraud,
misappropriation or embezzlement, or any conviction or admission of a felony or
other offense involving dishonest or moral turpitude. Notwithstanding the
foregoing, the Executive shall not be deemed, for purposes of this Agreement, to
have been terminated for Cause unless and until there shall have been delivered
to the Executive a copy of a resolution duly adopted by the affirmative vote of
not less than five-eighths of the entire membership of the Company's Board at a
meeting of the Board called and held for that purpose (after reasonable notice
to the Executive and an opportunity for the Executive, together with the
Executive's counsel, to be heard before the Board), finding that in the good
faith opinion of the Board the Executive was guilty of conduct set forth in the
second sentence of this Section 3(d) and specifying the particulars thereof in
detail.

               (e) Good Reason. The Executive may terminate the Executive's
employment for Good Reason at any time after a Change in Control during the
Term. For purposes of this Agreement, "Good Reason" shall mean any of the
following:

                                       2
<PAGE>   3

                  (i) The Company has materially changed the Executive's
position, duties, responsibilities, status, or offices as in effect immediately
prior to a Change in Control of the Company, or has removed the Executive from
or failed to reelect the Executive to any of such positions;

                  (ii) A reduction by the Company in the Executive's base salary
as in effect on the date hereof or as the same may be increased from time to
time during the Term.

                  (iii) Any failure by the Company to continue in effect any
benefit plan or arrangement (including, without limitation, the Company's life
insurance, accident, disability and health insurance plans, 401(k) and bonus
plans, stock options, and all other similar plans which are from time to time
made generally available to senior executives/officers of the Company) and in
which the Executive is participating at the time of a Change in Control of the
Company, unless there are substituted therefore plans or arrangements providing
the Executive with essentially equivalent and no less favorable benefits
(hereinafter referred to as "Benefit Plans"), or the taking of any action by the
Company which would adversely affect the Executive's participation in or
materially reduce the Executive's benefits under any such Benefit Plan or
deprive the Executive of any material fringe benefit enjoyed by the Executive at
the time of a Change in Control of the Company;

                  (iv) Any failure by the Company to continue in effect any
incentive plan or arrangement (including, without limitation, the Company's
plans enumerated in subparagraph (iii) above and similar incentive compensation
benefits) in which the Executive is participating at the time of a Change in
Control of the Company, unless there are substituted therefore plans or
arrangements providing the Executive with essentially equivalent and no less
favorable benefits (hereinafter referred to as "Incentive Plans"), or the taking
of any action by the Company which would adversely affect the Executive's
participation in any such Incentive Plan or reduce the Executive's potential
benefits under any such Incentive Plan, expressed as a percentage of his base
salary, by more than 10 percentage points in any fiscal year as compared to the
immediately preceding fiscal year;

                  (v) Any failure by the Company to continue in effect any plan
or arrangement to receive securities of the Company (including, without
limitation, the Company's stock option and purchase plans and any other plan or
arrangement to receive and exercise stock options, stock appreciation rights,
restricted stock or grants thereof) in which the Executive is participating at
the time of a Change in Control of the Company, unless there are substituted
therefor plans or arrangements providing the Executive with essentially
equivalent and no less favorable (hereinafter referred to as "Securities
Plans"), or the taking of any action by the Company which would adversely affect
the Executive's participation in or materially reduce the Executive's benefits
under any such Securities Plan;

                  (vi) A relocation of the Company's principal executive offices
to a location outside of Orange County, California, or the Executive's
relocation to any place other than the location at which the Executive performed
the Executive's duties prior to a Change in Control of the Company, except for
required travel by the Executive on the Company's business to an extent
substantially consistent with the Executive's business travel obligations during
the 12 months immediately preceding a Change of Control of the Company;

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<PAGE>   4

                  (vii) Any failure by the Company to provide the Executive with
the number of paid vacation days to which the Executive is entitled at the time
of a Change of Control of the Company;

                  (viii) Any material breach by the Company of any provision of
this Agreement;

                  (ix) Any failure by the Company to obtain the assumption of
this Agreement by any successor or assignee of the Company; or

                  (x) Any purported termination of the Executive's employment
that is not effected pursuant to a Notice of Termination satisfying the
requirements of Section 3(f), and for purposes of this Agreement, no such
purported termination shall be effective.

               (f) Notice of Termination. Any termination of the Executive by
the Company for Disability pursuant to Section 3(b) or for Cause pursuant to
Section 3(d) shall be communicated by a Notice of Termination. For purposes of
this Agreement, a "Notice of Termination" shall mean a written notice which
shall indicate those specific termination provisions in this Agreement relied
upon and which set forth in reasonable detail the facts and circumstances
claimed to provide a basis for termination of the Executive's employment under
the provisions so indicated. For purposes of this Agreement, no such purported
termination by the Company shall be effective without such Notice of
Termination.

               (g) Date of Termination. "Date of Termination" shall mean (i) if
the Executive is terminated by the Company for Disability, 30 days after Notice
of Termination is given to the Executive (provided that the Executive shall not
have returned to the performance of the Executive's duties on a full-time basis
during such 30-day period) or (ii) if the Executive is terminated by the Company
for any other reason, the date on which a Notice of Termination is given;
provided that if within 30 days after any Notice of Termination is given to the
Executive by the Company the Executive notifies the Company that a dispute
exists concerning the termination, the Date of Termination shall be the date the
dispute is finally determined, whether by mutual agreement by the parties or
upon final judgment, order or decree of a court of competent jurisdiction (the
time for appeal therefrom having expired and no appeal having been perfected).

         4. Severance Compensation upon Termination of Employment. Subject to
Section 4(e) below, if, within twenty-four (24) months following a Change in
Control, the Company shall terminate the Executive's employment other than
pursuant to Section 3(b), 3(c) or 3(d), or if the Executive terminates his
employment for Good Reason pursuant to Section 3(e), then:

               (a) Severance Payment. The Company shall pay to the Executive as
severance pay a lump sum, in cash, in full on the fifth day following the Date
of Termination an amount equal to (i) the Executive's highest annual base salary
in effect during the 12-month period immediately preceding the Date of
Termination, and (ii) a lump sum payment of the Executive's incentive
compensation bonus that would otherwise be payable to Executive under the
Company's Bonus Plan then in effect for the year in which the Date of
Termination occurred assuming one hundred percent (100%) satisfaction of all
performance goals established under such Bonus Plan for the Executive,
multiplied 2.99. The foregoing payment shall be in addition to any payments or
other compensation that would otherwise be payable to executives under any other
then existing Severance Plan of the

                                       4
<PAGE>   5
Company. All payments hereunder shall be made net of withholdings required by
applicable federal, state or local laws.

               (b) Stock Options. All stock options not currently exercisable
held by the Executive will accelerate and become exercisable as of the Date of
Termination.

               (c) Restricted Stock. All restrictions on any restricted stock,
including without limitation any vesting requirements on any unvested stock,
held by the Executive as of the Date of Termination shall be removed.

               (d) Continuation of Benefits. The Company shall continue for a
period of one year from the Date of Termination to provide the following
benefits to the Executive on the same terms as provided to the Executive on the
Date of Termination:

                   (i) Participation in the Company's medical, dental and vision
plans;

                   (ii) Long-term disability insurance;

                   (iii) Life Insurance.

Notwithstanding the foregoing, any benefits payable under this subsection 4(d)
shall terminate at such time as the Executive becomes eligible for similar
benefits from any subsequent employer; provided, however, that at the end of the
period of coverage hereinabove provided for, the Executive shall have the option
to have assigned to the Executive at no cost and with no apportionment of
prepaid premiums, any assignable insurance owned by the Company and relating
specifically to the Executive.

               (e) Limitation. To the extent that any or all of the payments and
benefits provided for in this Agreement constitute "parachute payments" within
the meaning of Section 280G of the Internal Revenue Code (the "Code") and, but
for this Section 4(e), would be subject to the excise tax imposed by Section
4999 of the Code, then the aggregate amount of such payments and benefits shall
be reduced such that the present value thereof (as determined under the Code and
applicable regulations) is equal to 2.99 times the Executive's "base amount" (as
defined in the Code).

The determination of any reduction or increase of any payment or benefits under
this Section 4 pursuant to the foregoing provision shall be made by a nationally
recognized public accounting firm chosen by the Company in good faith, and such
determination shall be conclusive and binding on the Company and the Executive.

         5. No Obligation to Mitigate Damages: No Effect on Other Contractual
Rights.

               (a) No Obligation to Mitigate. The Executive shall not be
required to mitigate damages or the amount of any payment provided for under
this Agreement by seeking other employment or otherwise, nor, except as set
forth in Section 4(d), shall the amount of any payment provided for under this
Agreement be reduced by any compensation earned by the Executive as the result
of employment by another employer after the Date of Termination, or otherwise.

               (b) No Effect on Other Contractual Rights. The provisions of this
Agreement, and any payment provided for hereunder, shall not reduce any amounts
otherwise payable, or in any way diminish the Executive's existing rights, or
rights which would accrue solely as a result of the

                                       5
<PAGE>   6

passage of time, under any Benefit Plan, Incentive Plan or Securities Plan,
employment agreement or other contract, plan or arrangement.

         6. Successors and Assigns.

               (a) The Company. As used in this Agreement, "Company" shall mean
the Company as hereinbefore defined and any successor or assignee to its
business and/or assets as aforesaid which assumes the obligations of the Company
under this Agreement or which otherwise becomes bound by all of the terms and
provisions of this Agreement by operation of law. If at any time during the term
of this Agreement the Executive is employed by any corporation a majority of the
voting securities of which is then owned by the Company, such indirect
employment of the Executive by the Company shall not excuse the Company from
performing its obligations under this Agreement as if the Executive were
directly employed by the Company, and the Company agrees that it shall pay or
shall cause such employer to pay any amounts owed to the Executive pursuant to
Section 4 hereof, notwithstanding any such indirect employment relationship.

               (b) The Executive. This Agreement shall inure to the benefit of
and be enforceable by the Executive's personal and legal representatives,
executors, administrators, successors, heirs, distributees, devisees and
legatees. If the Executive should die while any amounts are still payable to him
hereunder, all such amounts, unless otherwise provided herein, shall be paid in
accordance with the terms of this Agreement to the Executive's devisee, legatee,
or other designee or, if there be no such designee, to the Executive's estate.

         7. Notice. For purposes of this Agreement, notices and all other
communications provided for in the Agreement shall be in writing and shall be
deemed to have been duly given when delivered, one business day after being sent
for overnight delivery by a nationally recognized overnight courier or three
business days after being mailed by United States registered mail,
return-receipt requested, postage-prepaid, addressed as follows:

               If to the Company:

                          President and Chief Executive Officer
                          Datum Inc.
                          9975 Toledo Way
                          Irvine, California 92618

               If to the Executive:

                          500 Dahlia
                          Corona del Mar, CA 92625

or such other address as either party may have furnished to the other in writing
in accordance herewith, except that notices of change of address shall be
effective only upon receipt.

         8. Miscellaneous. No provisions of this Agreement may be modified,
waived or discharged unless such waiver, modification or discharge is agreed to
in writing signed by the Executive and the Company. No waiver by either party
hereto at any time of any breach by the other party hereto of, or compliance
with, any condition or provision of this Agreement to be performed by such other
party shall be deemed a waiver of similar or dissimilar provisions or conditions
at the

                                       6
<PAGE>   7

same or at any prior or subsequent time. No agreements or representations, oral
or otherwise, express or implied, with respect to the subject matter hereof have
been made by either party which are not set forth expressly in this Agreement.
This Agreement shall be governed by and construed in accordance with the laws of
the State of California.

         9. Validity. The invalidity or unenforceability of any provisions of
this Agreement shall not affect the validity or enforceability of any other
provision of this Agreement, which shall remain in full force and effect.

         10. Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed to be an original but all of which
together will constitute one and the same instrument.

         11. Arbitration, Legal Fees and Expenses. In the event of any
controversy, claim or dispute between the parties hereto arising out of or
relating to this Agreement, the matter shall be determined by arbitration, which
shall take place in Orange County, California, under the rules of the American
Arbitration Association; and a judgment upon such award may be entered in any
court having jurisdiction thereof. Any decision or award of such arbitrator
shall be final and binding upon the parties and shall not be appealable. The
parties hereby consent to the jurisdiction of such arbitrator and of any court
having jurisdiction to enter judgment upon and enforce any action taken by such
arbitrator. The Company shall pay all legal fees and expenses that the Executive
may incur as a result of the Company's contesting the validity, enforceability
or the executive's interpretation of, or determinations under, this Agreement.

         12. Confidentiality. The Executive shall retain in confidence any and
all confidential information known to the Executive concerning the Company and
its business so long as such information is not otherwise publicly disclosed.

         13. Entire Agreement. This Agreement contains all of the terms agreed
upon between the Executive and the Company with respect to the subject matter
hereof and replaces and supersedes all prior severance agreements between the
Executive and the Company. The Executive and the Company agree that no term,
provision or condition of this Agreement shall be held to be altered, amended,
changed or waived in any respect except as evidenced by written agreement of the
Executive and the Company.

         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date and year first above written.

"COMPANY"                                  "EXECUTIVE"

DATUM, INC.

By:  /s/ DAN L. MCGURK                     By:  /s/ ERIK H. VAN DER KAAY
     --------------------------------           --------------------------------
Name:    Dan L. McGurk                     Name:    Erik H. van der Kaay
Title:   Chairman of the Compensation      Title:   President and Chief
         Committee                                  Executive Officer

                                       7

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