Exhibit 4.6
                                                                     -----------

                         CHYRSALIS SYMBOLIC DESIGN, INC.

                             1993 STOCK OPTION PLAN

1.       PURPOSE

         The purpose of this 1993 Stock Option Plan (the "Plan") is to advance
the interests of CHRYSALIS SYMBOLIC DESIGN, INC. (the "Company") by enhancing
the ability at the Company and its subsidiaries to attract and retain employees,
consultants or advisers who are in a position to make significant contributions
to the success of the Company; to reward such individuals tar their
contributions g and to encourage such individuals to take into account the
long-ten interests of the Company through interests in shares of the Company's
common stock (the "Stock"). Any employee, consultant or adviser designated to
participate in the Plan is referred to as a "participant".

         Options granted pursuant to the Plan may be incentive stock options as
defined in section 422 of the Internal Revenue Code of 1906 (as from time to
time amended, the "Code") (any option that is intended so to qualify as an
incentive stock option being referred to herein as an "incentive option"), or
options that are not incentive options, or both. Except as otherwise expressly
provided with respect to an option grant, no option granted pursuant to the Plan
shall be an incentive option.

2.       ADMINISTRATION

         The Plan shall be administered by the Board of Directors (the "Board")
of the Company. The Board shall have authority, not inconsistent with the
express provisions of the Plan, (a) to grant awards consisting or options or
stack appreciation rights ("SARs") or both, to such participants as the Board
may select; (b) to determine the time at, times when awards shall be granted and
the number of shares of stock subject to each award; (c) to determine which
options are, and which options are not, incentive options; (d) to determine the
terms and conditions of each Award; (e) to prescribe the form or forms of any
instruments evidencing awards and any other instruments required under the Plan
and to change such forms from time to time; (f) to adopt, emend and rescind
rules and regulations for the administration of the Plan; and (g) to interpret
the Plan and to decide any questions and settle all controversies and disputes,
that may arise in connection with the Plan. Such determinations of the Board
shall be conclusive and shall bind all parties. Subject to Section 8 the Board
shall also have the authority, both generally and in particular instances, to
waive compliance by a participant with any obligation to be performed by him
under an award, to waive any condition or provision of an award, and to amend or
cancel any award (and if an award is canceled, to grant a new award on such
terms as the Board shall specify), except that the Board may not take any action
with respect to an outstanding award that would adversely affect the rights of
the participant under such award without such participant's consent. Nothing in
the preceding sentence shall be construed as limiting the power of the Board to
make adjustments required by Section 4(c) and Section 6(j).

         The Board may, in its discretion, delegate some or all of its powers
with respect to the Plan to a Committee (the "Committee"), in which' event all
references (as appropriate) to the Board hereunder shall be deemed to refer to
the committee. The Committee, if one is appointed, shall consist of at least two
directors. A majority of the members of the Committee shall constitute a quorum,
and all determinations at the Committee shall be made by a majority of its
members. Any determination of the committee under the Plan may be made without
notice or meeting of the Committee by a writing signed by a majority of the
Committee members. On and after registration of the Stock under the Securities
Exchange Act of 1934, the Board shall delegate the power to a elect directors
and officers to native awards under the Plan and the timing, pricing and .amount
of such awards to a committee, all members of which shall be disinterested
persons within the meaning of Rule 16b-3 under that Act.

3.       EFFECTIVE DATE AND TERM OF PLAN

         The Plan shall become effective on the date on which it is approved by
the shareholder at the Company. Grants of awards under the Plan may be made
prior to that date (but after Board adoption of the Plan), subject act to
approval of the Plan by such shareholders.

         No awards shall be granted under the Plan after the completion of ten
years trot the date on which the Plan was adopted by the Board, but awards
previously granted may extend beyond that date.

4.       SHARES SUBJECT TO THE PLAN

         (a) Number of Shares. Subject to adjustment as provided in Section
4(c), the aggregate number of shins of Stock that may be delivered upon the
exercise of awards granted under the Plan shall be 407,635. If any award granted
under the Plan terminates without having been exercised is full, or upon
exercise is satisfied other than by delivery of Stock, the number of shares of
shares of stock as to which such award was not exercised shall be available fur
future grants within the limits set forth in this Section 4(a).

         (b) Shares to be Delivered. Shares delivered under the Plan shall be
authorized but unissued Stock or, if the Board so decides in its sole
discretion, previously issued Stock acquired by the Company and held in its
treasury. No fractional shares of stock shall be delivered under the Plan.

         (c) Changes in Stock. In the event of a stack dividend, stock split or
combination of shares, recapitalization or other change in the Company's capital
stock, the number and kind of shares of stack or securities of the Company
subject to awards then outstanding or subsequently granted under the Plan, the
exercise price of such awards, the maximum number of shares or securities that
nay be delivered under the Plan, and other relevant provisions shall be
appropriately adjusted by the Board, whose determination shall be binding on all
persons.

         The Board may also adjust the number of shares subject to outstanding
awards, the exercise price of outstanding awards and the terms of outstanding
awards, to take into consideration material changes in accounting practices or
principles, extraordinary dividends, consolidations or mergers (except those
described in Section 6(j)), acquisitions or dispositions of stock or property or
any other event if it is determined by the Board that such adjustment is
appropriate to avoid distortion in the operation of the Plan, provided that no
such adjustment shall be made in the case of an incentive option, without the
consent of the participant, if it would constitute a modification, extension or
renewal of the option within the meaning of Section 424(h) of the Code.

5.       ELIGIBILITY FOR AWARDS

         Persons eligible to receive awards under the Plan shall be those
participants who, in the opinion of the Board, are in a position to make a
significant contribution to the success of the Company and its subsidiaries. A
subsidiary for purposes of the Plan shall be a corporation in which the Company
owns, directly or indirectly, stock possessing 50% or sore of the total combined
voting power at all classes of stock. Incentive options shall be granted only to
"employees" as defined in the provisions of the Code or regulations thereunder
applicable to incentive stock options.

6.       TERMS AND CONDITIONS OF OPTIONS AND SARS

         (a) Exercise Price of Options. The exercise price of each option shall
be determined by the Board but in the case of an incentive option shall not be
less than 100% (110%, in the case of an incentive option granted to a
ten-percent shareholder) of the fair market value of the Stock at the time the
option is granted; nor shall the exercise price be less, in the case of an
original issue of authorized stock, than par value. Per this "fair market value"
in the case of incentive options the sac meaning as it does in the provisions of
the Code sad the regulations thereunder applicable to incentive options; and
"ten-percent shareholder" shall mean any participant who at the time at grant
owns directly, or by reason of the attribution rules set forth in section 424(d)
of the Code is deemed to own, stock possessing more than 10% at the total
combined voting power of all classes of stock of the Company or at any of its
parent or subsidiary corporations.

         (b) Duration of Options. An option Shall be exercisable during such
period or periods as the Board say specify. The latest date on which an option
may be exercised (the "Final Exercise Date") shall be the date which is ten
years (five years, in the cast of an incentive option granted to a "ten-percent
shareholder" as defined in (a) above) tram the date the option vat granted or
such earlier date as may be specified by the Board at the time the option is
granted.

         (c)      Exercise of Options.

         (1)      An option shall become exercisable at such time or times and
                  upon such conditions as the Board shall, specify. In the case
                  of an option not immediately exercisable in full, the Board
                  may at any time accelerate the time at which all or any part
                  of the option say be exercised.

         (2)      Any exercise of an option shall be in writing, signed r person
                  and furnished to the Company, accompanied by (i) such
                  documents as may be required by the Board and (ii) payment in
                  full as specified below in Section 6(d) for the number of
                  shares for which the option is exercised.

         (3)      In the case of option that is not an incentive option, the
                  Board shall have the right to require that the participant
                  exercising the option remit to the Company art amount
                  sufficient to satisfy any federal, State, or local withholding
                  tax requirements (or make other arrangements satisfactory to
                  the company with regard to such taxes) prior to the delivery
                  of any Stock pursuant to the exercise of the option. If
                  permitted by the Board, either at the time of the grant of the
                  option or the time of exercise, the participant nay elect, at
                  such time and in such manner as the Board may prescribe, to
                  satisfy such withholding obligation by (i) delivering to the
                  Company Stock owned by such individual having a fair market
                  value equal to such withholding obligation, or (ii) requesting
                  that the company withhold from the shares of stock to be
                  delivered upon the exercise a number of shares of Stock having
                  a fair market value equal to such withholding obligation.

                  In the case of an incentive option, If at the time the option
                  is exercised the Board determines that under applicable law
                  and regulations the Company could be liable for the
                  withholding of any federal or state tax with respect to a
                  disposition of the Stock received upon exercise, the Board hay
                  require as a condition of exercise that the participant
                  exercising the option agree (i) to inform the Company promptly
                  of any disposition (within the meaning of Section 424(c) of
                  the coda and the regulations thereunder) of stock received
                  upon exercise, and (ii) to give such security as the Board
                  deems adequate to meet the potential liability of the Company
                  for the withholding of - tax, and to augment sixth security
                  iris time to time in any amount reasonably deemed necessary by
                  the Board to preserve the adequacy of such security.

         (4)      If an option is exercised by the executor or administrator at
                  a deceased participant, or by the person or persons to whoa
                  the option has been transferred by the participant's will or
                  the applicable laws of descent and distribution, the Company
                  shall be under no obligation to deliver Stock pursuant to such
                  exercise until the Company is satisfied as to the authority of
                  the person or parsons exercising the option.

         (d) Payment for and Delivery of Stock. Stock purchased upon exercise at
an option under the Plan shall be paid for as follows: (i) in cash or by
personal check, certified check, bank draft or money order payable to the order
of the company or (ii) if so permitted by the Board (which, in the case of an
incentive option, shall specify such method of payment at the time of grant),
(A) through the delivery of shares of Stock (which, in the case or stock
acquired from the Company, shall have been held for at least six months) having
fair market value on the last business day preceding the date of exercise equal
to the purchase price or (B) by delivery of a promissory note of the participant
to the Company, such note to be payable on such terms as are specified by the
Board or (C) by delivery of an unconditional and irrevocable undertaking by a
broker to deliver promptly to the Company sufficient funds to pay the exercise
price or (D) by any combination of the permissible forms of payment; provided,
that if the stock delivered upon exercise of the option is an original issue of
authorized stock, at least so much of the exercise price as represents the par
value of such Stock shall be paid other than with a personal check or promissory
note of the person exercising the option.

         (e) Stock Appreciation Rights. The Board in its discretion say grant
SARs either in tandem with or independent of options awarded under the Plan.
Except as hereinafter provided, each SAR will entitle the participant to receive
upon exercise, with respect to each share of Stock to which the SAR relates, the
excess of (i) the share's value on the date of exercise, over (ii) the share's
fair market value on the date it was granted. Per purposes of clause (i),
"value" shall mean fair market value; provided, that the Board may adjust such
value to take into account dividends on the Stock and may also grant SARs that
provide, in such limited circumstances following a change in control of the
Company (as determined by the Board) as the Board may specify, that "value" for
purposes of clause (i) is to be determined by reference to an average value for
the Stock during a period immediately preceding the change in control, an as
determined by the Board. The amount payable to a participant upon exercise of an
SAR shall be paid either in cash or in shares of Stock, as the Board determines.
Each SAR shall be exercisable during such period or periods and on such terms as
the Board may specify. No SAR shall be exercisable after the date which is ten
years from the date of grant.

         (f) Delivery of Stock. A participant shall not have the rights of a
shareholder with regard to awards under the Plan except as to Stock actually
received by him under the Plan.

         The Company shall not be obligated to deliver any shares of stock (i)
until, in the opinion of the Company's counsel, all applicable federal and state
laws and regulations have been complied with, and (ii) if the outstanding Stock
is at the time listed on any stock exchange, until the shares to be delivered
have been listed or authorized to be listed an such exchange upon official
notice of issuance, and (iii) until all other legal matters in connection with
the issuance and delivery of such shares have been approved by the Company's
counsel. If the sale of Stock has not been registered under the Securities Act
of 1933, as amended, the Company may require, as a condition to exercise `of the
award, such representations or agreements as counsel for the Company may
consider appropriate to avoid violation of such Act and may require that the
certificates evidencing such Stock bear an appropriate legend restricting
transfer.

         (g) Nontransferability of Awards. No award may be transferred other
than by will or by the laws at descent and distribution, and during a
participant's lifetime an award may be exercised only by him.

         (h) Death. If a participant dies, each award held by the participant
immediately prior to death may be exercised, to the extent it was exercisable
immediately prior to death, by his executor or administrator, or by the person
or persons to whom the award is transferred by win or the applicable laws or
descent and distribution, at any time within the period ending with the first
anniversary of the participants death but in no event beyond the Final Exercise
Data. All awards held by a participant immediately prior to death that are not
then exercisable shall terminate on the date of death.

         (i) Other Termination of Service. If an employee's employment with the
Company and its subsidiaries terminates for any reason, other than death, all
awards held by the employee that are not then exercisable shall terminate.
Awards that are exercisable on the date employment terminates shall continue to
be exercisable for a period of three months (or such longer period as the
Committee may determine, but in no event beyond the Final Exercise Date) unless
the employee was discharged for cause which in the opinion of the Board casts
such discredit on him as to justify termination of his awards. After completion
of that three-month period such awards shall terminate to the extent not
previously exercised, expired or terminated. For purposes of this Section 6(i),
employment shall not be considered terminated (i) in the case of sick leave or
other bona fide leave of absence approved for purposes of the Plan by the board,
so long as the employee's right to reemployment is guaranteed either by statute
or by contract, or (ii) in the case of a transfer of employment between the
company and a subsidiary or between subsidiaries, or to the employment of a
corporation (or a parent or subsidiary corporation of such corporation) issuing
or assuming an award in a transaction to which Section 424(a) of the Code
applies.

         In the case of a participant who is not an employee, provisions
relating to the exercisability of awards following termination of service shall
be specified in the award. If not so specified, all awards held by such
participant that are not then exercisable shall terminate upon termination of
service. Awards that are exercisable on the date the participant's service as a
consultant terminates shall continue to be exercisable f or a period of three
months (or such longer period as the Committee may determine, but in no event
beyond the Final Exercise Date) unless the participant was terminated for cause
which in the opinion of the Board casts such discredit on him as to justify
termination of his awards. After completion of that three-month period such
awards shall terminate to the extent not previously exercised, expired or
terminated.

         (j) Mergers, etc. 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 the Company's outstanding Stock by a single person or
entity or by a group of persons and/or entities acting in concert, or in the
event of the sale or transfer of substantially all the Company's assets, all
outstanding awards shall thereupon terminate, provided that at least 20 days
prior to the effective date of any such merger, consolidation or sale of assets,
the Board shall either (i) make all outstanding awards excercisable immediately
prior to consolidation of such merger, consolidation or sale of assets or (ii)
if there is a surviving or acquiring corporation, arrange, subject to
consummation of the merger, consolidation or sale of assets, to have that
corporation or an affiliate of that corporation grant to participants
replacement awards which in the case of incentive awards satisfy, in the
determination of the board, the requirements of section 424(a) of the Code.

         The Board may grant awards Under the Plan in substitution, for awards
held by employees, consultants or advisers of another corporation who
concurrently become employees, consultants or advisers of the company or a
subsidiary of the Company as the result of a merger or consolidation of that
corporation with the Company or a subsidiary of the Company, or as the result of
the acquisition by the company or a subsidiary of the Company of property or
stock of that corporation. The Company may direct that substitute awards be
granted on such terms and conditions as the Board considers appropriate in the
circumstances.

7.       EMPLOYMENT RIGHTS

         Neither the adoption of the Plan nor the grant of awards shall confer
upon any participant any right to continue as an employee of, or consultant or
adviser to, the Company or any parent or subsidiary or affect in any way the
right of the Company or parent or subsidiary to terminate them at any time.
Except as specifically provided by the Board in any particular cases the loss of
existing or potential profit in awards granted under this Plan shall not
constitute an element of damages in the event of termination of the relationship
of a participant even if the termination is in violation of an obligation of the
company to the participant by contract or otherwise.

8.       EFFECT, DISCONTINUANCE, CANCELLATION, AMENDMENT AND TERMINATION

         Neither adoption of the Plan nor the grant of awards to a participant
shall affect the Company's right to sake awards to such participant that are not
subject to the Plan, to issue to, such participant Stock as a bonus or
otherwise, or to adopt other plans or arrangements under which Stock may be
issued.

         The Board say at any time discontinue granting awards under the Plan.
With the consent of the participant, the Board may at any tins cancel an
existing award in whole or in pert and grant another award for such number of
shares as the Board specifies. The Board say at any time or times amend the Plan
or any outstanding award for the purpose of satisfying the requirements of
section 422 of the Code or at any changes in applicable laws or regulations or
for any other purpose that may at the tine be permitted by law, or may at any
time terminate the Plan as to any further grants of awards, no such amendment
shall adversely affect the rights of any participant (without his consent) under
any award previously granted.




<PAGE>



                         CHRYSALIS SYMBOLIC DESIGN, INC.

                       Incentive Stock Option Certificate

         Stock Option granted by Chrysalis Symbolic Design, Inc. a Delaware
Corporation (the "Company"), to__________ ("Optionee"), pursuant to the
Company's 1993 Stock Option Plan.

1.       Grant of Option.

         This certificate evidences the grant by the Company on October 17, 1997
("Grant Date") to the Optionee of an option to purchase, in whole or in part, on
the terms herein provided, a total of _____ shares of common stock of the
Company (the "Shares") at ____ per Share. This option shall expire on the date
ten years from the Grant Date ("Final Exercise Date"). The option evidenced by
this certificate is an incentive stock option ("ISO").

         Subject to acceleration as provided below, the Shares shall vest and
thereby become exercisable according to the following schedule; provided,
however, that no additional Shares shall vest following the last day of
Optionee's full time employment by the Company.


                      ------------------------------
                      October 17, 1998
                      ------------------------------
                      January 17, 1999
                      ------------------------------
                      April 17, 1999
                      ------------------------------
                      July 17, 1999
                      ------------------------------
                      October 17, 1999
                      ------------------------------
                      January 17, 2000
                      ------------------------------
                      April 17, 2000
                      ------------------------------
                      July 17, 2000
                      ------------------------------
                      October 17, 2000
                      ------------------------------
                      January 17, 2001
                      ------------------------------
                      April 17, 2001
                      ------------------------------
                      July 17, 2001
                      ------------------------------
                      October 17, 2001
                      ------------------------------
                               TOTAL SHARES
                      ------------------------------

         Upon the consolidation of the Company with or the acquisition of the
Company by another entity, whether by merger, sale or transfer or all its
capital stock, or by sale of substantially all of its assets or otherwise, then
immediately prior to the consummation of such event, the vesting dates for all
Shares not then vested shall be accelerated by twelve (12) months. For example,
Shares that would normally not have vested until February 1, 1998 shall instead
vest on February 1, 1997.

2.       Exercise of Option.

         Each election to exercise this option shall be in writing, signed by
the Optionee or by his executor or administrator or the person or persons to
whom this option is transferred by will or the applicable laws of descent and
distribution (the "Legal Representative"), and received b the Company at its
principal office, accompanied by this certificate, and payment in full. The
purchase price may be paid by delivery of cash, certified check, bank draft, or
money order. In the event that this option is exercised by the Optionee's Legal
Representative, the Company shall be under no obligation to deliver Shares
hereunder unless and until the Company is satisfied as to the authority of the
person or persons exercising this option.

3.       Restrictions on Transfer.

         The Optionee represents and warrants to the Company that upon acquiring
any of the Shares, he will be acquiring them for his own account for investment
only and not with a view to distribution or resale of the Shares. The Optionee
agrees not to sell or otherwise dispose of the Shares in violation of the
provisions of the Securities Act of 1933, as amended (the "Act"). The Optionee
understands that the Shares issued upon exercise of this option will be issued
pursuant to an exemption form the registration requirements of the Act, and,
accordingly, must be held indefinitely by Optionee unless they are later
transferred in transactions that are either registered under the Act or exempt
from registration. The Optionee understands that the Company is under no
obligation to register the Shares under the Act or to file for or comply with an
exemption from registration, and recognizes that exemptions from registration,
in any case, are limited and may not be available when the Optionee may wish to
sell, transfer or otherwise dispose of the Shares. The Optionee also understands
that the certificate(s) representing the Shares will bear the following legends
restricting their transfer and that a notation restricting their transfer will
be made on the stock transfer books of the Company:

                  The shares of stock represented by this certificate have not
         be registered under the Securities Act of 1933, as amended, and may not
         be sold, assigned, pledged or otherwise transferred in the absence of
         an effective registration statement under said Act covering the
         transfer or an opinion of counsel satisfactory to the issuer that
         registration under said Act is not required.

         If at the time when this option is exercised the Company is a party to
any agreement restricting the transfer of any outstanding shares of its Common
Stock, this option may be exercised only if the Shares so acquired are made
subject to the transfer set forth in that agreement (or if more than one such
agreement is then in effect, the agreement specified by the Board).

         In addition, the Optionee agrees, for himself and his heirs and Legal
Representatives, that he will enter into any "lock-up" or similar agreements
requested by the Company in connection with any initial public offering of the
shares of the Company's stock.

4.       Death and Other Termination.

         If an Optionee dies, this option may be exercised to it extent it was
exercisable immediately prior to death by his executor or administrator, or by
the person or persons to whom the award is transferred by will or the applicable
laws of descent and distribution, at any time within the period ending with the
first anniversary of the Optionee's death but in no event beyond the Final
Exercise Date. Any portion of this option not exercisable immediately prior to
Optionee's death shall terminate on the date of death.

         If an Optionee's employment with the Company and its subsidiaries
terminates for any reason, other than death, any portion of this option not then
exercisable shall terminate. Any portion of this option that is exercisable on
the date employment terminates shall continue to be exercisable for a period of
three months (or such longer period as the Board of Directors may determine, but
in no event beyond the Final Exercise Date) unless the Optionee was discharge
for cause which in the opinion of the Board casts such discredit on him as to
justify termination of his Option. After completion of that three-month period
this option shall terminate to the extent not previously exercised, expired or
terminated. For purposes of this paragraph, employment shall not be considered
terminated (i) in the case of sick leave or other bona fide leave of absence
approved by the Board, so long as the Optionee's right to reemployment is
guaranteed either by statute or by contract, or (ii) in the case of a transfer
between the Company and a subsidiary or between subsidiaries, or to the
employment of a corporation (or a parent or subsidiary corporation of such
corporation) issuing or assuming this option in a transaction to which section
424(a) of the Code applies.

5.       Nontransferability of Option.

         This option is not transferable by the Optionee or other than by will
or the laws of descent and distribution, and is exercisable during the
Optionee's lifetime only by the Optionee.

6.       1993 Stock Option Plan.

         This option is subject in its entirety to the provision of the
Company's 1993 Stock Option Plan, a copy of which is furnished to the Optionee
with this option.

         IN WITNESS WHEREOF, the Company has caused is option to be executed
under its corporate seal by its duly authorized officer. This option shall take
effect as a sealed instrument.

                                    CHRYSALIS SYMBOLIC DESIGN, INC.


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


                                    Name:
                                         ---------------------------------------


                                    Title:
                                          --------------------------------------

Accepted and agreed: