Document:

<PAGE>

                                 EXHIBIT 10.6
                                 ------------

                           INDEMNIFICATION AGREEMENT
                           -------------------------

          INDEMNIFICATION AGREEMENT, dated as of this 1st day of September 1999,
by and between musicmusicmusic, inc., a Delaware corporation (the "Company"),
and the director and/or officer whose name appears on the signature page of this
Agreement ("Indemnitee").

                                   RECITALS
                                   --------

          A.  Highly competent persons are becoming more reluctant to serve as
directors or officers or in other capacities unless they are provided with
reasonable protection through insurance or indemnification against risks of
claims and actions against them arising out of their service to and activities
on behalf of the corporations.

          B.  The Board of Directors of the Company (the "Board" or the "Board
of Directors") has determined that the Company should act to assure its
directors and officers that there will be increased certainty of such protection
in the future.

          C.  It is reasonable, prudent and necessary for the Company
contractually to obligate itself to indemnify such persons to the fullest extent
permitted by applicable law so that they will serve or continue to serve the
Company free from undue concern that they will not be so indemnified.

          D.  Indemnitee is willing to serve, to continue to serve and to take
on additional service for or on behalf of the Company on the condition that
Indemnitee be so indemnified.

                                   AGREEMENT
                                   ---------

          In consideration of the premises and the covenants contained herein,
the Company and Indemnitee do hereby covenant and agree as follows:

          1.  Definitions.  For purposes of this Agreement:
              -----------

          (a) "Affiliate" shall mean any corporation, partnership, joint
venture, trust or other enterprise in respect of which the Indemnitee is or was
or will be serving as a director, officer, advisory director or Board Committee
member at the request of the Company, and including, but not limited to, any
employee benefit plan of the Company or any of the foregoing.

          (b) "Disinterested Director" shall mean a director of the Company who
is not or was not a party to the Proceeding in respect of which indemnification
is being sought by Indemnitee.

                                       1
<PAGE>

          (c) "Expenses" shall include all attorneys' fees and costs, retainers,
court costs, transcripts, fees of experts, witness fees, travel expenses,
duplicating costs, printing and binding costs, telephone charges, postage,
delivery service fees and all other disbursements or expenses incurred in
connection with asserting or defending claims.

          (d) "Independent Counsel" shall mean a law firm or lawyer that neither
is presently nor in the past five years has been retained to represent:  (i) the
Company or Indemnitee in any matter material to any such party or (ii) any other
party to the Proceeding giving rise to a claim for indemnification hereunder.
Notwithstanding the foregoing, the term "Independent Counsel" shall not include
any firm or person who, under the applicable standards of professional conduct
then prevailing, would have a conflict of interest in representing any of the
Company or Indemnitee in an action to determine Indemnitee's right to
indemnification under this Agreement.  All Expenses of the Independent Counsel
incurred in connection with acting pursuant to this Agreement shall be borne by
the Company.

          (e) "Losses" shall mean all losses, claims, liabilities, judgments,
fines, penalties and amounts paid in settlement in connection with any
Proceeding.

          (f) "Proceeding" includes any action, suit, arbitration, alternate
dispute resolution mechanism, investigation, administrative hearing or any other
proceeding whether civil, criminal, administrative or investigative; provided,
                                                                     --------
however, that the term "Proceeding" shall include any action instituted by an
-------
Indemnitee (other than an action to enforce indemnification rights under this
Agreement) only if such action is authorized by the Board of Directors.

     2.  Service by Indemnitee. Indemnitee agrees to begin or continue to serve
         ---------------------
the Company or an Affiliate as a director and/or officer. Notwithstanding
anything contained herein, this Agreement shall not create a contract of
employment between the Company and Indemnitee, and the termination of
Indemnitee's relationship with the Company or an Affiliate by either party
hereto shall not be restricted by this Agreement.

     3.  Indemnification. The Company agrees to indemnify Indemnitee for, and
         ---------------
hold Indemnitee harmless from and against, any Losses or Expenses at any time
incurred by or assessed against Indemnitee arising out of or in connection with
the service of Indemnitee as a director, advisory director, Board Committee
member, officer, employee or agent of the Company or of an Affiliate
(collectively referred to as an "Officer or Director of the Company or of an
Affiliate"), whether the basis of such proceeding is alleged action in an
official capacity or in any other capacity while serving as an Officer or
Director of the Company or of an Affiliate, to the fullest extent permitted by
the laws of the State of Delaware in effect on the date hereof or as such laws
may from time to time hereafter be amended to increase the scope of such
permitted indemnification. Without diminishing the scope of the indemnification
provided by this Section 3, the rights of indemnification of Indemnitee provided
hereunder shall include but shall not be limited to those rights set forth
hereinafter.

                                       2
<PAGE>

     4.   Action or Proceeding Other Than an Action by or in the Right of the
          -------------------------------------------------------------------
Company. Indemnitee shall be entitled to the indemnification rights provided
-------
herein if Indemnitee is a person who was or is made a party or is threatened to
be made a party to any pending, completed or threatened Proceeding, other than
an action by or in the right of the Company, by reason of (a) the fact that
Indemnitee is or was an Officer or Director of the Company or of an Affiliate or
(b) anything done or not done by Indemnitee in any such capacity. Pursuant to
this Section, Indemnitee shall be indemnified against Losses or Expenses
incurred by Indemnitee or on Indemnitee's behalf in connection with any
Proceeding, if Indemnitee acted in good faith and in a manner Indemnitee
reasonably believed to be in or not opposed to the best interests of the Company
and, with respect to any criminal Proceeding, had no reasonable cause to believe
his conduct was unlawful.

     5.   Actions by or in the Right of the Company. Indemnitee shall be
          -----------------------------------------
entitled to the indemnification rights provided herein if Indemnitee is a person
who was or is made a party or is threatened to be made a party to any pending,
completed or threatened Proceeding brought by or in the right of the Company to
procure a judgment in its favor by reason of (a) the fact that Indemnitee is or
was an Officer or Director of the Company or of an Affiliate or (b) anything
done or not done by Indemnitee in any such capacity. Pursuant to this Section,
Indemnitee shall be indemnified against Losses or Expenses actually and
reasonably incurred by Indemnitee or on Indemnitee's behalf in connection with
any Proceeding if Indemnitee acted in good faith and in a manner Indemnitee
reasonably believed to be in or not opposed to the best interests of the
Company. Notwithstanding the foregoing provisions of this Section, no such
indemnification shall be made in respect of any claim, issue or matter as to
which Delaware law expressly prohibits such indemnification by reason of an
adjudication of liability of Indemnitee to the Company; provided, however, that
                                                        --------  -------
in such event such indemnification shall nevertheless be made by the Company to
the extent that the Court of Chancery of the State of Delaware or the court in
which such action or suit was brought shall determine equitable under the
circumstances.

     6.   Indemnification for Losses and Expenses of Party Who is Wholly or
          -----------------------------------------------------------------
Partly Successful. Notwithstanding any provision of this Agreement, to the
-----------------
extent that Indemnitee has been wholly successful on the merits or otherwise
absolved in any Proceeding on any claim, issue or matter, Indemnitee shall be
indemnified against all Losses or Expenses actually and reasonably incurred by
Indemnitee or on Indemnitee's behalf in connection therewith. If Indemnitee is
not wholly successful in such Proceeding but is successful, on the merits or
otherwise, as to one or more but less than all claims, issues or matters in such
Proceeding, the Company agrees to indemnify Indemnitee, to the maximum extent
permitted by law, against all Losses and Expenses incurred by Indemnitee in
connection with each successfully resolved claim, issue or matter. In any review
or Proceeding to determine the extent of indemnification, the Company shall bear
the burden of proving any lack of success and which amounts sought in indemnity
are allocable to claims, issues or matters which were not successfully resolved.
For purposes of this Section and without limitation, the termination of any such
claim, issue or matter by dismissal with or without prejudice shall be deemed to
be a successful resolution as to such claim, issue or matter.

                                       3
<PAGE>

     7.   Payment for Expenses of a Witness. Notwithstanding any other provision
          ---------------------------------
of this Agreement, to the extent that Indemnitee is, by reason of the fact that
Indemnitee is or was an Officer or Director of the Company or of an Affiliate, a
witness in any Proceeding, the Company agrees to pay to Indemnitee all Expenses
actually and reasonably incurred by Indemnitee or on Indemnitee's behalf in
connection therewith.

     8.   Advancement of Expenses and Costs. All Expenses incurred by or on
          ---------------------------------
behalf of Indemnitee (or reasonably expected by Indemnitee to be incurred by
Indemnitee within three months) in connection with any Proceeding shall be paid
promptly by the Company, and in any event in advance of the final disposition of
such Proceeding within sixty days after the receipt by the Company of a
statement or statements from Indemnitee requesting from time to time such
advance or advances, whether or not a determination to indemnify has been made
under Section 9. Such statement or statements shall evidence such Expenses
incurred (or reasonably expected to be incurred) by Indemnitee in connection
therewith and shall include or be accompanied by a written undertaking by or on
behalf of Indemnitee to repay such amount if it shall ultimately be determined
that Indemnitee is not entitled to be indemnified therefor pursuant to the terms
of this Agreement. The right to indemnification of advances as granted by this
Section 8 shall be enforceable by the director or officer in any court of
competent jurisdiction, if the Company denies such request, in whole or in part,
or if no disposition thereof is made within 60 days. Such person's costs and
expenses incurred in connection with successfully establishing his/her right to
indemnification, in whole or in part, in any such action shall also be
indemnified by the Company. It shall be a defense to any such action seeking an
adjudication or award in arbitration pursuant to this Agreement (other than an
action brought to enforce a claim for the advance of costs, charges and expenses
under this Section 8 where the required undertaking, if any, has been received
by the Company) that the claimant has not met the standard of conduct set forth
in the General Corporation Law of Delaware, as the same exists or hereafter may
be amended (but, in the case of any such amendment, only to the extent that such
amendment permits the Company to provide broader indemnification rights than
said law permitted the Company to provide prior to such amendment), but the
burden of proving such defense shall be on the Company. Neither the failure of
the Company (including its Board of Directors, its independent legal counsel and
its stockholders) to have made a determination prior to the commencement of such
action that indemnification of the claimant is proper in the circumstances
because he/she has met the applicable standard of conduct set forth in the
General Corporation Law of Delaware, as the same exists or hereafter may be
amended (but, in the case of any such amendment, only to the extent that such
amendment permits the Company to provide broader indemnification rights that
said law permitted the Company to provide prior to such amendment), nor the fact
that there has been an actual determination by the Company (including its Board
of Directors, its independent legal counsel and its stockholders) that the
claimant has not met such applicable standard of conduct, shall be a defense to
the action or create a presumption that the claimant has not met the applicable
standard of conduct.

                                       4
<PAGE>

     9.   Procedure for Determination of Entitlement to Indemnification. (a)
          -------------------------------------------------------------
When seeking indemnification under this Agreement (which shall not include in
any case the right of Indemnitee to receive payments pursuant to Section 7 and
Section 8 hereof, which shall not be subject to this Section 9), Indemnitee
shall submit a written request for indemnification to the Company. Such request
shall include documentation or information which is reasonably necessary for the
Company to make a determination of Indemnitee's entitlement to indemnification
hereunder and which is reasonably available to Indemnitee. Determination of
Indemnitee's entitlement to indemnification shall be made promptly, but in no
event later than 60 days after receipt by the Company of Indemnitee's written
request for indemnification. The Secretary of the Company shall, promptly upon
receipt of Indemnitee's request for indemnification, advise the Board that
Indemnitee has made such request for indemnification.

          (b)  The entitlement of Indemnitee to indemnification under this
Agreement in respect of any pending, contemplated or threatened Proceeding shall
be determined in the specific case by (a) the Board of Directors by a majority
vote of those directors who were not party to such Proceeding, whether or not
they constitute a quorum of the Board of Directors, or (b) if such a quorum is
not obtainable, or if a quorum of disinterested directors so directs, by
Independent Counsel in a written opinion, or (c) by the stockholders.

          (c)  In the event the determination of entitlement is to be made by
Independent Counsel, such Independent Counsel shall be selected by the Board and
approved by Indemnitee.  Upon failure of the Board to so select such Independent
Counsel or upon failure of Indemnitee to so approve of the choice thereof, such
Independent Counsel shall be selected by a neutral third party mutually
agreeable among the Board and the Indemnitee to make such selection.

          (d)  If the determination made pursuant to Section 9(b) is that
Indemnitee is not entitled to indemnification to the full extent of Indemnitee's
request, Indemnitee shall have the right to seek entitlement to indemnification
in accordance with the procedures set forth in Section 10 hereof.

          (e)  If the person or persons empowered pursuant to Section 9(b)
hereof to make a determination with respect to entitlement to indemnification
shall have failed to make the requested determination within 60 days after
receipt by the Company of such request, the requisite determination of
entitlement to indemnification shall be deemed to have been made and Indemnitee
shall be absolutely entitled to such indemnification, absent (i)
misrepresentation by Indemnitee of a material fact in the request for
indemnification or (ii) a final judicial determination that all or any part of
such indemnification is expressly prohibited by law.

          (f)  The termination of any Proceeding by judgment, order, settlement
or conviction, or upon a plea of nolo contendere or its equivalent, shall not,
                                 ---------------
of itself, adversely affect the rights of Indemnitee to indemnification
hereunder, except as may be specifically provided herein, or create a
presumption that Indemnitee did not act in good

                                       5
<PAGE>

faith and in a manner which Indemnitee reasonably believed to be in or not
opposed to the best interests of the Company or create a presumption that (with
respect to any criminal action or Proceeding) Indemnitee had reasonable cause to
believe that Indemnitee's conduct was unlawful.

          (g)  For purposes of any determination of good faith hereunder,
Indemnitee shall be deemed to have acted in good faith if in taking an action
Indemnitee relied on the records or books of account of the Company or an
Affiliate, including financial statements, or on information supplied to
Indemnitee by the officers of the Company or an Affiliate in the course of their
duties, or on the advice of legal counsel for the Company or an Affiliate or on
information or records given or reports made to the Company or an Affiliate by
an independent certified public accountant or by an appraiser or other expert
selected with reasonable care by the Company or an Affiliate.  The Company shall
have the burden of establishing the absence of good faith.  The provisions of
this Section 9(g) shall not be deemed to be exclusive or to limit in any way the
other circumstances in which the Indemnitee may be deemed to have met the
applicable standard of conduct set forth in this Agreement.

          (h)  The knowledge and/or actions, or failure to act, of any director,
officer, agent or employee of the Company or an Affiliate shall not be imputed
to Indemnitee for purposes of determining the right to indemnification under
this Agreement.

          10.  Remedies in Cases of Determination Not to Indemnify or to Advance
               -----------------------------------------------------------------
Expenses. (a) In the event that (i) a determination is made that Indemnitee is
--------
not entitled to indemnification hereunder, (ii) advances are not made pursuant
to Section 8 hereof or (iii) payment has not been timely made following a
determination of entitlement to indemnification pursuant to Section 9 hereof,
Indemnitee shall be entitled to seek an adjudication in an appropriate court of
the State of Delaware or any other court of competent jurisdiction as to
Indemnitee's entitlement to such indemnification or advance.

          (b)  In the event a determination has been made in accordance with the
procedures set forth in Section 9 hereof, in whole or in part, that Indemnitee
is not entitled to indemnification, any judicial proceeding or arbitration
referred to in paragraph (a) of this Section 10 shall be de novo and Indemnitee
                                                         -- ----
shall not be prejudiced by reason of any such prior determination that
Indemnitee is not entitled to indemnification, and the Company shall bear the
burdens of proof specified in paragraphs 6 and 9 hereof in such proceeding.

          (c)  If a determination is made or deemed to have been made pursuant
to the terms of Section 9 or 10 hereof that Indemnitee is entitled to
indemnification, the Company shall be bound by such determination in any
judicial proceeding or arbitration in the absence of (i) a misrepresentation of
a material fact by Indemnitee or (ii) a final judicial determination that all or
any part of such indemnification is expressly prohibited by law.

                                       6
<PAGE>

          (d)  The Company and Indemnitee agree that they shall be precluded
from asserting that the procedures and presumptions of this Agreement are not
valid, binding and enforceable. The Company and Indemnitee further agree to
stipulate in any such court that the Company and Indemnitee are bound by all of
the provisions of this Agreement and are precluded from making any assertion to
the contrary.

          (e)  To the extent deemed appropriate by the court, interest shall be
paid by the Company to Indemnitee at a reasonable interest rate for amounts
which the Company indemnifies or is obliged to indemnify the Indemnitee for the
period commencing with the date on which Indemnitee requested indemnification
(or reimbursement or advance of an Expense) and ending with the date on which
such payment is made to Indemnitee by the Company.

     11.  Expenses Incurred by Indemnitee to Enforce this Agreement. All
          ---------------------------------------------------------
Expenses incurred by Indemnitee in connection with the preparation and
submission of Indemnitee's request for indemnification hereunder shall be borne
by the Company. In the event that Indemnitee is a party to or intervenes in any
proceeding in which the validity or enforceability of this Agreement is at issue
or seeks an adjudication to enforce Indemnitee's rights under, or to recover
damages for breach of, this Agreement, Indemnitee, if Indemnitee prevails in
whole in such action, shall be entitled to recover from the Company, and shall
be indemnified by the Company against, any Expenses incurred by Indemnitee. If
it is determined that Indemnitee is entitled to indemnification for part (but
not all) of the indemnification so requested, Expenses incurred in seeking
enforcement of such partial indemnification shall be reasonably prorated among
the claims, issues or matters for which the Indemnitee is entitled to
indemnification and for claims, issues or matters for which the Indemnitee is
not so entitled.

     12.  Non-Exclusivity. The rights of indemnification and to receive advances
          ---------------
as provided by this Agreement shall not be deemed exclusive of any other rights
to which Indemnitee may at any time be entitled under or by reason of applicable
law, any certificate of incorporation or by-laws, any agreement, any vote of
stockholders or any resolution of directors or otherwise. To the extent
Indemnitee would be prejudiced thereby, no amendment, alteration, rescission or
replacement of this Agreement or any provision hereof shall be effective as to
Indemnitee with respect to any action taken or omitted by such Indemnitee in
Indemnitee's position with the Company or an Affiliate or any other entity which
Indemnitee is or was serving at the request of the Company prior to such
amendment, alteration, rescission or replacement.

     13.  Duration of Agreement.  This Agreement shall apply to any claim
          ---------------------
asserted and any Losses and Expenses incurred in connection with any claim
asserted on or after the effective date of this Agreement and shall continue
until and terminate upon the later of:  (a) 10 years after Indemnitee has ceased
to occupy any of the positions or have any of the relationships described in
Sections 3, 4 or 5 of this Agreement; or (b) one year after the final
termination of all pending or threatened Proceedings of the kind described
herein with respect to Indemnitee.  This Agreement shall be binding upon the
Company and its successors and assigns and shall inure to the benefit of
Indemnitee and

                                       7
<PAGE>

Indemnitee's spouse, assigns, heirs, devisee, executors, administrators or other
legal representatives.

     14.  Severability. Should any part, term or condition hereof be declared
          ------------
illegal or unenforceable or in conflict with any other law, the validity of the
remaining portions or provisions of this Agreement shall not be affected
thereby, and the illegal or unenforceable portions of the Agreement shall be and
hereby are redrafted to conform with applicable law, while leaving the remaining
portions of this Agreement intact.

     15.  Counterparts. This Agreement may be executed in several counterparts,
          ------------
each of which shall be deemed an original, but all of which together shall
constitute one and the same document.

     16.  Headings. Section headings are for convenience only and do not control
          --------
or affect meaning or interpretation of any terms or provisions of this
Agreement.

     17.  Modification and Waiver. No supplement, modification or amendment of
          -----------------------
this Agreement shall be binding unless executed in writing by each of the
parties hereto.

     18.  No Duplicative Payment. The Company shall not be liable under this
          ----------------------
Agreement to make any payment of amounts otherwise indemnifiable hereunder if
and to the extent that Indemnitee has otherwise actually received such payment
(net of Expenses incurred in collecting such payment) under this Agreement, any
insurance policy, contract, agreement or otherwise.

     19.  Notices. All notices, requests, demands and other communications
          -------
provided for by this Agreement shall be in writing (including telecopier or
similar writing) and shall be deemed to have been given at the time when mailed
in a registered or certified postpaid envelope in any general or branch office
of the United States Postal Service, or sent by Federal Express or other similar
overnight courier service, addressed to the address of the parties stated below
or to such changed address as such party may have fixed by notice or, if given
by telecopier, when such telecopy is transmitted and the appropriate answer back
is received.

          (a)  If to Indemnitee, to the address appearing on the signature page
hereof.

          (b)  If to the Company to:

               musicmusicmusic, inc.
               99 Atlantic Avenue, Suite 100
               Toronto, Ontario,
               M6K 3I8 Canada
               Attention: President

                                       8
<PAGE>

     20.  GOVERNING LAW. THE PARTIES AGREE THAT THIS AGREEMENT SHALL BE GOVERNED
          -------------
BY, AND CONSTRUED AND ENFORCED IN ACCORDANCE WITH, THE INTERNAL LAWS OF THE
STATE OF DELAWARE WITHOUT GIVING EFFECT TO THE CONFLICTS OF LAWS PRINCIPLES
THEREOF.

     21.  Entire Agreement. Subject to the provisions of Section 12 hereof, this
          ----------------
Agreement constitutes the entire understanding between the parties and
supersedes all proposals, commitments, writings, negotiations and
understandings, oral and written, and all other communications between the
parties relating to the subject matter of this Agreement. This Agreement may not
be amended or otherwise modified except in writing duly executed by all of the
parties. A waiver by any party of any breach or violation of this Agreement
shall not be deemed or construed as a waiver of any subsequent breach or
violation thereof.

                           [Signature Page Follows]

                                       9
<PAGE>

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

                         musicmusicmusic, inc.

                         By /s/ Travis L. Gering
                           -------------------------------------------
                         Name:  Travis L. Gering
                         Title: Corporate Secretary

                         INDEMNITEE:

                         /s/ Wolfgang Spegg
                         ---------------------------------------------
                         Name:    Wolfgang Spegg
                         Title:   President, CEO and Director
                         Address: c/o musicmusicmusic, inc.
                                  99 Atlantic Avenue, Suite 100
                                  Toronto, Ontario,
                                  M6K 3I8 Canada

                                       10
<PAGE>

           SCHEDULE TO ADDITIONAL COMPANY INDEMNIFICATION AGREEMENTS
           ---------------------------------------------------------

The following Indemnification Agreements are omitted in accordance with
Instruction 2 to Item 601 of Regulation S-K as they are identical to the
foregoing Exhibit No. 10.6 Indemnification Agreement and differ only as to party
and/or date of execution as follows:

1. Indemnification Agreement with Claudio Faoro differs only as to Indemnitee.
2. Indemnification Agreement with Dr. Guido Sandler differs only as to
Indemnitee.
3. Indemnification Agreement with Dr. Alexander Paulus differs only as to
Indemnitee.
4. Indemnification Agreement with Alexander Henry differs only as to Indemnitee.
5. Indemnification Agreement with Travis L. Gering differs only as to
Indemnitee.
6. Indemnification Agreement with Edward R. Irwin differs as to Indemnitee and
date of execution which was November 29, 1999.

                                       11<PAGE>   1
                                                                     Exhibit 4.5

                             AMENDMENT NO. 1 TO THE
                                RIGHTS AGREEMENT
                            OF SUMMIT AUTONOMOUS INC.
                         (F/K/A SUMMIT TECHNOLOGY, INC.)

         This Amendment No. 1, dated as of May 26, 2000, amends the Rights
Agreement dated as of March 28, 2000 (the "RIGHTS AGREEMENT"), between Summit
Autonomous Inc., f/k/a Summit Technology Inc., a Massachusetts corporation (the
"COMPANY"), and Fleet National Bank (f/k/a BankBoston, N.A.), as Rights Agent
(the "RIGHTS AGENT"). Terms defined in the Rights Agreement and not otherwise
defined herein are used herein as so defined.

                              W I T N E S S E T H:

         WHEREAS, on March 28, 2000, the Board of Directors of the Company
authorized the issuance of Rights to purchase, on the terms and subject to the
provisions of the Rights Agreement, shares of the Company's Preferred Stock;

         WHEREAS, on March 28, 2000, the Board of Directors of the Company
authorized and declared a dividend distribution of one Right for every share of
Common Stock of the Company outstanding on the Dividend Record Date and
authorized the issuance of one Right (subject to certain adjustments) for each
share of Common Stock of the Company issued between the Dividend Record Date and
the Distribution Date;

         WHEREAS, the Distribution Date has not occurred; and

         WHEREAS, pursuant to Section 27 of the Rights Agreement, the Board has
approved an amendment of certain provisions of the Rights Agreement as set forth
below;

         NOW, THEREFORE, the Rights Agreement is hereby amended as follows:

         1. Section 1(a) is amended by deleting the phrase "or (v)" after clause
(iv) and adding the following language:

            "(v) an Exempt Person, or (vi)"

         2. A new definition is added after Section 1(w) and before Section 1(x)
as follows:

            "(w') "Exempt Person" shall mean Alcon Acquisition Corp., a
            Massachusetts corporation ("SUB"), and its Affiliates solely to the
            extent any such Person becomes the Beneficial Owner of 15% or more
            of the shares of Common Stock then outstanding by reason of the
            execution of, or the consummation of the

<PAGE>   2

            transactions contemplated by, the Agreement and Plan of Merger,
            dated as of May 26, 2000 (the "MERGER AGREEMENT"), by and among
            Alcon Holdings Inc., a Delaware corporation, Sub and the Company;
            PROVIDED, that this Section 1(w') shall automatically be of no
            further force and effect at and after such time as the Merger
            Agreement is terminated pursuant to Section 8.01 thereof.

         3. Section 1(y) is amended by deleting the phrase "or (iv)" after
clause (iii) and adding the following language:

            ", (iv) an Exempt Person, or (v)"

         4. The first sentence of Section 7(a) is amended and restated in its
entirety as follows:

            "Except as otherwise provided herein, the registered holder of any
            Rights Certificate may exercise Rights evidenced thereby in whole or
            in part at any time from and after the Distribution Date and at or
            prior to the earlier of (i) the Close of Business on March 28, 2010
            or (ii) the effective time of the merger contemplated by the Merger
            Agreement (PROVIDED, that this clause (ii) shall automatically be of
            no further force and effect at and after such time as the Merger
            Agreement is terminated pursuant to Section 8.01 thereof) (the
            earlier of such time being, the "Expiration Date") or the earlier
            redemption of the Rights."

         5. Section 24(a) is amended by deleting the phrase "or (iv)" after
clause (iii) in the last sentence and adding the following language:

            "(iv) an Exempt Person, or (v)"

         6. Except as hereby modified and amended, the Rights Agreement shall
remain in full force and effect and unchanged.

          [The Remainder of the Page has been Intentionally Left Blank]

                                      -2-

<PAGE>   3

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment No. 1
to the Rights Agreement to be duly executed as of the day and year first above
written.

                                            SUMMIT AUTONOMOUS INC.

                                            By: /s/ ROBERT J. KELLY
                                               ------------------------------
                                            Title: Chief Financial Officer

Attest:

By: /s/ P. Bernard Haffey
   ----------------------------

                                            FLEET NATIONAL BANK

                                            By: /s/ Tyler Haynes
                                               ------------------------------
                                            Title: Managing Director

Attest:

By: /s/ James Walsh
   ----------------------------

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