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EXHIBIT 10.4    
  

 
 

PREVIEW SYSTEMS, INC.
  SEPARATION AGREEMENT AND MUTUAL RELEASE    
  

    This Separation Agreement and Mutual Release ("Agreement") is made by and between Preview Systems, Inc.,
a Delaware corporation (the "Company"), and Bradford G. Solso ("Mr. Solso"). 

    WHEREAS, Mr. Solso was employed as Chief Operating Officer and Chief Financial Officer of the Company; 

    WHEREAS, Mr. Solso has tendered his voluntary resignation to the Company; and 

    WHEREAS, the Company and Mr. Solso have mutually agreed to terminate the existing employment relationship and to release each
other from any claims arising from or related to the employment relationship. 

    NOW, THEREFORE, in consideration of the mutual promises made herein, the Company and Mr. Solso (collectively referred to as the  "Parties") hereby agree as follows:

    1.  Resignation as an Officer; Termination of Employment.  Mr. Solso and the Company acknowledge
and agree that Mr. Solso has tendered his voluntary resignation as Chief Operating Officer and Chief Financial Officer of the Company, and from any other positions he holds with the Company
and/or its subsidiaries and affiliates and that the Company has accepted such resignation. In accordance with the intentions of the Parties, Mr. Solso's employment with the Company shall
terminate effective at the close of business on March 20, 2001 (the "Termination Date"). 

    2.  Severance Benefits.  In consideration for the release of claims set forth below and other obligations
under this Agreement, and provided this Agreement is signed by Mr. Solso and not revoked under Section 7 herein, the Company agrees to provide
the following severance benefits to Mr. Solso: 

        (a) The
Company shall make two lump sum severance payments to Mr. Solso as follows: 1) a payment equal to twelve (12) months of his regular base
salary and target bonus for fiscal year 2001, resulting in an aggregate payment of $270,000, which payment shall be reduced by applicable tax withholding and which shall be made on the Effective Date
of this Agreement (as defined in Section 20 below); and 2) a payment equal to six (6) months of his regular base salary ($105,000), reduced by applicable tax withholding, which payment shall be made
on the 6-month anniversary of the Effective Date of this Agreement, provided that as such date Mr. Solso has been and remains in full compliance with the terms of this Agreement; 

        (b) If
Mr. Solso timely and accurately elects to continue his health insurance benefits under COBRA, as described in Section 3(a) below,
the Company agrees to pay the applicable COBRA premiums until the earlier of December 31, 2001 or the date on which Mr. Solso becomes eligible for medical insurance coverage from another
employer; 

        (c) As
more fully described in Section 4 below, the Company agrees to provide certain benefits to Mr. Solso related to the shares of the
Company's Common Stock purchased by Mr. Solso in July 1999 under the terms of a full recourse promissory note; 

        (d) The
Company shall reimburse Mr. Solso for fees incurred in obtaining tax or financial accounting advice with respect to this Agreement, up
to a maximum amount of $5,000; and 

        (e) The
Company shall continue to maintain coverage for Mr. Solso under the Company's director and officer liability insurance program for a
period of three (3) years following the Termination Date, but only if and to the extent that such insurance is maintained for other officers and directors of the Company in general. 

1

 

    3.  Employee Benefits.  

        (a) Mr. Solso
shall continue to receive the Company's life, medical, dental and vision insurance benefits at Company expense until
March 31, 2001, which date shall be the "qualifying event" date under the Consolidated Omnibus Budget Reconciliation Act of 1985, as amended ("COBRA"). Following such
date, Mr. Solso has the right to continue coverage under the Company's medical, dental and vision (but not life) insurance programs as provided by COBRA at his own expense, except as otherwise
provided in Section 2(b) above. 

        (b) The
Company shall reimburse Mr. Solso for all reasonable business expenses incurred by Mr. Solso up until the Termination Date in
accordance with Company policy. 

        (c) Except
as otherwise provided above, Mr. Solso shall not be entitled to participate in any of the Company's benefit plans or programs offered
to employees or officers of the Company, including the employee stock purchase plan, after the Termination Date. Payroll contributions made to the employee stock purchase plan by Mr. Solso
shall be returned to Mr. Solso as soon as reasonably practicable after the Termination Date. 

    4.  Stock Interests.  

      (a)  Restricted Stock.  
Under the terms of the Common Stock Purchase Agreement executed by Mr. Solso and the Company on July 6, 1999 (the "Purchase Agreement"),
Mr. Solso purchased 150,000 shares of the Company's Common Stock (the "Shares") with a per Share purchase price of $6.50, for a total purchase
price of $975,000. Mr. Solso paid the purchase price for the Shares by delivering to the Company a personal check in the amount of $30.00 and a full recourse promissory note (the  "Note") dated July
6, 1999 in the original aggregate principal amount of $974,970.00, bearing 5.32% interest per annum on the unpaid balance of such
principal sum, copies of which are attached hereto as Exhibit A. Mr. Solso purchased the Shares subject to a right of repurchase by the Company
at Mr. Solso's original cost of $6.50 per Share on the termination of Mr. Solso's relationship with the Company as an employee or consultant pursuant to the terms of the Purchase
Agreement. Such repurchase right was to lapse at a rate of 3/48 of the Shares on the three-month anniversary of the Vesting Commencement Date (as defined in the Purchase Agreement), at the rate of
6/48 of the Shares on the six-month anniversary of the Vesting Commencement Date and thereafter at the rate of 1/48th of the total number of Shares each month. As of the Termination Date, the Parties
acknowledge and agree that (1) the outstanding balance under the Note, not including accrued interest, remains $974,970.00, and that such balance, together with accrued interest, is due and
payable on the Termination Date, (2) the Company's repurchase right under the Purchase Agreement has lapsed as to 62,500 of the Shares and (3) the Company has the right, but not the
legal obligation, to repurchase 87,500 unvested Shares. 

            (i)  Acceleration of Vesting.  
In consideration for the release of claims set forth below and other obligations under this Agreement, and notwithstanding the terms of the Purchase Agreement, the Company shall, immediately prior to
the Effective Date, release an additional 43,750 of the Shares from the Company's right of repurchase. 

            (ii)  Repurchase of Shares.  
In further consideration for the release of claims set forth below and other obligations under this Agreement, and notwithstanding the terms of the Purchase Agreement, the Company shall repurchase
50,000 of the Shares held by Mr. Solso. Pursuant to the terms of the Purchase Agreement, the Company shall pay the total repurchase price for the repurchased Shares by canceling $325,000.00 of
the principal amount of Mr. Solso's indebtedness to the Company due under the Note for such shares. Upon such cancellation, Mr. Solso acknowledges and agrees that he owes to the Company
the remaining principal balance of $649,970.00 for the vested Shares and the accrued interest on the entire original principal amount, with such principal balance, together with accrued interest,
being immediately due and payable. 

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            (iii)  Forgiveness of Promissory Note.  
In further consideration for the release of claims set forth below and other obligations under this Agreement, the Company shall forgive the aggregate amount of $739,213.00 on the Note, which
represents the principal amount of $649,970.00 (after reduction of the Note following the share repurchased described in subsection (ii) above) plus the accrued interest of $89,243.00 on the
entire original principal amount of the Note. In accordance with applicable tax law, the aggregate forgiven amount shall be reported as taxable income to Mr. Solso on his Form W-2 for 2001. The
Company agrees that it shall provide a one-time tax gross-up payment to Mr. Solso equal to the amount of income tax payable by Mr. Solso with respect to the amount of interest forgiven
on the Note, with the documentation for the income tax liability on such interest to be provided to the Company by Mr. Solso prior to any such payment. Mr. Solso acknowledges and agrees
that he shall remain liable for the income tax payable with respect to the amount of forgiven principal on the Note. 

      (b)  Stock Option.  
Mr. Solso acknowledges and agrees that under the terms of the stock option granted to Mr. Solso in June 2000 to purchase 100,000 shares of the Company's Common Stock under the
terms of the Company 1998 Stock Option Plan (the "Stock Option Agreement"), 8,333 shares shall have vested as of the Termination Date and that no
additional option shares shall vest after the Termination Date. Mr. Solso acknowledges that the 8,333 vested option shares must be exercised within the post-termination time period set forth in
the Stock Option Agreement. 

    Except
as set forth in this Section 4 and in the Purchase Agreement and the Stock Option Agreement, Mr. Solso acknowledges that as of the Termination Date, Mr. Solso
shall have no right, title or interest in or to any shares of the Company's capital stock under the Purchase Agreement, the Stock Option Agreement, or any other agreement (oral or written) or plan
with the Company. 

    5.  No Other Payments Due.  Mr. Solso and the Company agree that the Company shall pay to
Mr. Solso on or before the Termination Date all salary, accrued vacation and other sums as are then due to Mr. Solso. By executing this Agreement, Mr. Solso hereby acknowledges
receipt of all such payments as received and acknowledges that, in light of the payment by the Company of all wages due to Mr. Solso,
California Labor Code Section 206.5 is not applicable to the Parties hereto. That section provides in pertinent part as follows: 

No
employer shall require the execution of any release of any claim or right on account of wages due, or to become due, or made as an advance on wages to be earned, unless payment of such wages has
been made. 

    6.  Release of Claims.  In consideration for the obligations of both parties set forth in this Agreement,
Mr. Solso and the Company, on behalf of themselves, and their respective heirs, executors, officers, directors, employees, investors, stockholders, agents, attorneys, administrators and
assigns, hereby fully and forever release each other and their respective heirs, executors, officers, directors, employees, investors, stockholders, agents, attorneys, administrators, predecessor and
successor corporations and assigns, of and from any claim, duty, obligation or cause of action relating to any matters of any kind, whether presently known or unknown, suspected or unsuspected, that
any of them may possess arising from any omissions, acts or facts that have occurred up until and including the date of this Agreement including, without limitation: 

        (a) any
and all claims relating to or arising from Mr. Solso's employment relationship with the Company and the termination of that
relationship; 

        (b) any
and all claims relating to, or arising from, Mr. Solso's right to purchase, or actual purchase of shares of stock of the Company; 

        (c) any
and all claims relating to, or arising from, the Note described in Section 4(a) above; 

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        (d) any and all claims for wrongful discharge of employment; breach of con-tract, both express and implied; breach of a covenant of good faith and fair
dealing, both express and implied, negligent or intentional infliction of emotional distress; negligent or intentional misrepresentation; negligent or intentional interference with contract or
prospective economic advantage; negligence; and defamation; 

        (e) any
and all claims for violation of any federal, state or municipal statute, including, but not limited to, Title VII of the Civil Rights Act of
1964, the Civil Rights Act of 1991, the Age Discrimination in Employment Act of 1967, the Americans with Disabilities Act of 1990, and the California Fair Employment and Housing Act; 

        (f)  any
and all claims arising out of any other laws and regulations relating to employment or employment discrimination; and 

        (g) any
and all claims for attorneys' fees and costs. 

    The
Company and Mr. Solso agree that the release set forth in this Section 6 shall be and remain in effect in all respects as a complete general release as to the matters
released. This release does not extend to any obligations incurred or specified under this Agreement. 

    7.  Acknowledgment of Waiver of Claims under ADEA.  Mr. Solso acknowledges that he is waiving and
releasing any rights he may have under the Age Discrimination in Employment Act of 1967 ("ADEA") and that this waiver and release is knowing and voluntary. Mr. Solso and the Company agree that
this waiver and release does not apply to any rights or claims that may arise under ADEA after the Effective Date of this Agreement. Mr. Solso acknowledges that the consideration given for this
waiver and release Agreement is in addition to anything of value to which Mr. Solso was already entitled. Mr. Solso further acknowledges that he has been advised by this writing that
(a) he should consult with an attorney prior to executing this Agreement; (b) he has at least twenty-one (21) days within which to consider this Agreement; (c) he has seven
(7) days following his execution of this Agreement to revoke the Agreement (the "Revocation Period"). This Agreement shall not be effective until the Revocation Period has expired. 

    8.  Civil Code Section 1542.  The Parties represent that they are not aware of any claim by either of
them other than the claims that are released by this Agreement. Mr. Solso and the Company acknowledge that they are familiar with the provisions of California Civil Code Section 1542, which
provides as follows: 

A
GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR DOES NOT KNOW OR SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING THE RELEASE, WHICH IF KNOWN BY HIM MUST HAVE MATERIALLY AFFECTED
HIS SETTLEMENT WITH THE DEBTOR. 

    Mr. Solso
and the Company, being aware of said Code section, agree to expressly waive any rights they may have thereunder, as well as under any other statute or common law
principles of similar effect. 

    9.  Employee Covenants.  

      (a)  General.  
Mr. Solso agrees that for all periods described in this Agreement, he shall continue to conduct himself in a professional manner that is supportive of the business of the Company. 

      (b)  Confidentiality.  
Mr. Solso and the Company agree to maintain in strict confidence the existence of this Agreement, the contents and terms of this Agreement, and the consideration for this Agreement (hereinafter
collectively referred to as "Settlement Information") and each Party further agrees to take every reasonable precaution to prevent disclosure of any
Settlement Information to any 

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person or entity, other than Mr. Solso's spouse, family members, tax and legal advisors and the Company's accounting and legal advisors, unless otherwise required to disclose such information
by law or by a governmental entity. 

      (c)  Nondisclosure.  
Mr. Solso represents and warrants that he has not breached his obligations to the Company under the terms of the existing Confidential Information and Assignment of Inventions Agreement entered
into between Mr. Solso and the Company (the "Confidentiality Agreement"), a copy of which is attached hereto as Exhibit B. Mr. Solso
understands and agrees that his obligations to the Company under the Confidentiality Agreement survive the termination of his relationship with the Company under this Agreement. 

      (d)  SEC Reporting.  
Mr. Solso will cooperate with the Company in providing information with respect to all reports required to be filed by the Company with the Securities and Exchange Commission as they relate to
required information with respect to Mr. Solso. 

    10.  Non-Disparagement.  Each Party agrees to refrain from any disparagement, criti-cism, defamation,
slander of the other, or tortious interference with the contracts and relationships of the other. 

    11.  Breach of this Agreement.  Mr. Solso acknowledges that upon his breach of any of the
covenants or obligations set forth in this Agreement, the Company would sustain irreparable harm from such breach, and, therefore, Mr. Solso agrees that in addition to any other damages or
remedies which the Company may have for any breach of this Agreement or otherwise, including termination of the Company's obligations to make any payments or provide any benefits to Mr. Solso
under any provision of this Agreement and forfeiture of any payments previously made and benefits previously provided to Mr. Solso under this Agreement, the Company shall be entitled to obtain
equitable relief, including specific performance, injunctions and restraining Mr. Solso from committing or continuing any such violation of this Agreement. 

    12.  Authority.  The Company represents and warrants that the undersigned has the authority to act on
behalf of the Company and to bind the Company and all who may claim through it to the terms and conditions of this Agreement. Mr. Solso represents and warrants that he has the capacity to act
on his own behalf and on behalf of all who might claim through his to bind them to the terms and conditions of this Agreement. Each Party warrants and represents that there are no liens or claims of
lien or assignments in law or equity or otherwise of or against any of the claims or causes of action released herein. 

    13.  No Representations.  Neither Party has relied upon any representations or statements made by the
other Party hereto which are not specifically set forth in this Agreement. 

    14.  Severability.  In the event that any provision hereof becomes or is declared by a court or other
tribunal of competent jurisdiction to be illegal, unenforceable or void, this Agreement shall continue in full force and effect without said provision. 

    15.  Arbitration.  The Parties shall attempt to settle all disputes arising in connection with this
Agreement through good faith consultation. In the event no agreement can be reached on such dispute within fifteen (15) days after notification in writing by either Party to the other concerning such
dispute, the dispute shall be settled by binding arbitration to be conducted in Santa Clara County before the American Arbitration Association under its California Employment Dispute Resolution Rules,
or by a judge to be mutually agreed upon. The arbitration decision shall be final, conclusive and binding on both Parties and any arbitration award or decision may be entered in any court having
jurisdiction. The Parties agree that the prevailing party in any arbitration shall be entitled to injunctive relief in any court of competent jurisdiction to enforce the arbitration award. The Parties
further agree that the prevailing Party in any such proceeding shall be awarded reasonable attorneys' fees and 

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costs. This Section 15 shall not apply to the Confidentiality Agreement. The parties hereby waive any rights they may have to trial by jury in regard to arbitrable
claims.

    16.  Indemnification.  The Indemnification Agreement entered into by Mr. Solso and the Company in
September 1999, a copy of which is attached hereto as Exhibit C, shall remain in effect following the Termination Date in accordance with the terms of such agreement. 

    17.  Entire Agreement.  This Agreement, and the exhibits hereto, represent the entire agreement and
understanding between the Company and Mr. Solso concerning Mr. Solso's separation from the Company, and supersede and replace any and all prior agreements and understandings concerning
Mr. Solso's relationship with the Company and his compensation by the Company. Any interpretation of
this Agreement shall not be made in a manner that is adverse to the Company solely by virtue of the Company being the drafter of this Agreement. 

    18.  No Oral Modification.  This Agreement may only be amended in writing signed by Mr. Solso and
the Company. 

    19.  Governing Law.  This Agreement shall be governed by the laws of the State of California, without
regard to its conflicts of law provisions. 

    20.  Effective Date.  This Agreement is effective upon the expiration of the Revocation Period described
in Section 7 and such date is referred to herein as the "Effective Date."

    21.  Counterparts.  This Agreement may be executed in counterparts, and each coun-terpart shall have the
same force and effect as an original and shall constitute an effective, binding agreement on the part of each of the undersigned. 

    22.  Assignment.  This Agreement may not be assigned by Mr. Solso or the Company without the prior
written consent of the other party. Notwithstanding the foregoing, this Agreement may be assigned by the Company to a corporation controlling, controlled by or under common control with the Company
without the consent of Mr. Solso. Any successor to the Company (whether direct or indirect by merger, asset purchase, or otherwise) to all or substantially all of the Company's business and/or
assets may assume the Company's obligations under this Agreement. 

    23.  Voluntary Execution of Agreement.  This Agreement is executed voluntarily and without any duress or
undue influence on the part or behalf of the Parties hereto, with the full intent of releasing all claims. The Parties acknowledge that: 

	(a)
	they
have read this Agreement;

	(b)
	they
have been represented in the preparation, negotiation, and execution of this Agreement by legal counsel of their own choice or that they have voluntarily declined to seek such
counsel;

	(c)
	they
understand the terms and consequences of this Agreement and of the releases it contains; and

	(d)
	they
are fully aware of the legal and binding effect of this Agreement. 

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    IN
WITNESS WHEREOF, the Parties have executed this Separation Agreement and Mutual Release on the respective dates set forth below. 

	 	 	Preview Systems, Inc.
	

Dated as of March   , 2001	
 	

By:	
 	

	 	 	Title:	 	Member, Compensation Committee of the Company's Board of Directors
	

 	
 	

BRADFORD G. SOLSO, an individual
	

Dated as of March   , 2001	
 	

 Bradford G. Solso

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EXHIBIT 10.4

PREVIEW SYSTEMS, INC. SEPARATION AGREEMENT AND MUTUAL RELEASE<PAGE>

                                                                    Exhibit 10.1

                 FIFTH AMENDMENT TO FOURTH AMENDED AND RESTATED
                          REGISTRATION RIGHTS AGREEMENT

         THIS FIFTH AMENDMENT, dated as of January 5th, 2001 (this "Agreement"),
to the Fourth Amended and Restated Registration Rights Agreement dated as of
April 11, 2000 as amended by the First Amendment thereto dated May 16, 2000, the
Second Amendment thereto dated June 5, 2000, the Third Amendment thereto dated
June 28, 2000 and the Fourth Amendment thereto dated June 28, 2000 (the
"Registration Rights Agreement"), by and among SPEECHWORKS INTERNATIONAL, INC.,
a Delaware corporation (the "Company") and the stockholders of the Company named
therein, is by and among the Company, Dr. Susan Hertz (the "New Investor") and
the persons named on the signature page hereto as Investors (collectively, the
"Investors"). All other capitalized terms used herein and not otherwise defined
have their respective meanings set forth in the Registration Rights Agreement.

         WHEREAS, the Company and the New Investor are parties to the Agreement
and Plan of Merger, dated as of December 19, 2000 (the "Merger Agreement"), by
and among the Company, SpeechWorks Acquisition Sub, Inc. (the "Merger Sub"),
Eloquent Technology, Inc. ("Eloquent") and the New Investor pursuant to which
Eloquent will be merged with and into Merger Sub (the "Merger");

         WHEREAS, the New Investor is the sole shareholder of Eloquent;

         WHEREAS, upon consummation of the Merger and in consideration therefor,
the Company will issue 299,873 shares of the Common Stock, $0.001 par value per
share (the "Shares"), of the Company to the New Investor pursuant to the terms
of the Merger Agreement;

         WHEREAS, it is a condition to the consummation of the Merger that the
Registration Rights Agreement shall be amended to add the New Investor as a
party to the Registration Rights Agreement; and

         WHEREAS, the Investors who are signatories hereto hold in the aggregate
a sufficient number of shares of Registrable Stock to amend the Registration
Rights Agreement in accordance with Section 14 thereof to add the New Investor
as party thereto.

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

         1. AMENDMENT TO SCHEDULE RRA (4TH REVISED). From and after the date
hereof, SCHEDULE RRA (4TH REVISED) to the Registration Rights Agreement is
deleted and replaced by SCHEDULE RRA (5TH REVISED), dated the date hereof and
attached hereto and the term "Investors" as used therein and herein shall mean
and refer to all the persons and entities identified on said SCHEDULE RRA (5TH
REVISED).

         2. CONTINUED EFFECT. As amended hereby, the Registration Rights
Agreement is hereby ratified and confirmed and agreed to by all of the parties
hereto and continues in full force and effect.

<PAGE>

         3. COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

         4. GOVERNING LAW. This Agreement shall be governed by, and construed in
accordance with the laws of the State of Delaware.

                            [signature pages follow]

                                       2

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Fifth Amendment
to the Fourth Amended and Restated Registration Rights Agreement to be executed
by their respective officers thereunto duly authorized, as of the date first
above written.

                                     SPEECHWORKS INTERNATIONAL, INC.

                                     By: /s/ Stuart Patterson
                                     ------------------------------------------
                                     Stuart Patterson, President and Chief
                                     Executive Officer

                                     NEW INVESTOR:

                                     ------------------------------------------
                                     Dr. Susan Hertz

                                     INVESTORS:

                                     NET2PHONE, INC.

                                     By:
                                        ---------------------------------------
                                     Name:
                                     Title:

                                     AMERICA ONLINE, INC.

                                     By:
                                        ---------------------------------------
                                     Name:
                                     Title:

                                     AT&T CORP.

                                     By:
                                        ---------------------------------------
                                     Name:
                                     Title:

                                       3

Signature Page to Fifth Amendment to Fourth Amended and Restated Registration
Rights Agreement

<PAGE>

                                     IGATE VENTURES I, L.P.

                                     By: /s/ David C. Whitmore
                                        ---------------------------------------
                                     Name: David C. Whitmore
                                     Title: Manager

                                     REUTERS HOLDINGS SWITZERLAND SA

                                     By:
                                        ---------------------------------------
                                     Name:
                                     Title:

                                     CITICORP STRATEGIC TECHNOLOGY CORP.

                                     By:
                                        ---------------------------------------
                                     Name:
                                     Title:

                                     GE CAPITAL EQUITY INVESTMENTS, INC.

                                     By:
                                        ---------------------------------------
                                     Name:
                                     Title:

                                     MCI WORLDCOM VENTURE FUND, INC.

                                     By: /s/ Douglas C. Webster
                                        ---------------------------------------
                                     Name: Douglas C. Webster
                                     Title: Vice President

                                     CHARLES RIVER PARTNERSHIP VII, LP
                                       by Charles River VII GP, LP
                                          Its General Partner

                                     By: /s/ Richard M. Burnes
                                        ---------------------------------------
                                     Name: Richard M. Burnes
                                     Title: General Partner

                                       4

Signature Page to Fifth Amendment to Fourth Amended and Restated Registration
Rights Agreement

<PAGE>

                                     ATLAS VENTURE FUND II, L.P.

                                     By: Atlas Venture Associates II, L.P., its
                                     general partner

                                     By: /s/ Barry J. Fidelman
                                        ---------------------------------------
                                     Name: Barry J. Fidelman
                                     Title: General Partner

                                     QUESTMARK PARTNERS, L.P.

                                     By: /s/ Thomas R. Hitchner
                                        ---------------------------------------
                                     Name: Thomas R. Hitchner
                                     Title: General Partner

                                     INTEL 64 FUND, LLC
                                     By: INTEL 64 FUND OPERATIONS, INC.,
                                     its Coordinating Member

                                     By: /s/ Kala Srinivasan
                                        ---------------------------------------
                                     Name: Kala Srinivasan
                                     Title: Assistant Treasurer

                                     BANK OF AMERICA VENTURES

                                     By: /s/ Robert M. Obuch
                                        ---------------------------------------
                                     Name: Robert M. Obuch
                                     Title: Principal

                                     BA VENTURE PARTNERS III

                                     By: /s/ Robert M. Obuch
                                        ---------------------------------------
                                     Name: Robert M. Obuch
                                     Title: General Partner

                                       5

Signature Page to Fifth Amendment to Fourth Amended and Restated Registration
Rights Agreement

<PAGE>

                                     RIGGS CAPITAL PARTNERS

                                     By: /s/ J. Carter Beese, Jr.
                                        ---------------------------------------
                                     Name: J. Carter Beese, Jr.
                                     Title: President

                                     MINTZ LEVIN INVESTMENTS LLC

                                     By:
                                        ---------------------------------------
                                     Name:
                                     Title:

                                     ------------------------------------------
                                     Steven P. Rosenthal

                                     ------------------------------------------
                                     Suzanne Abair and Kathleen MacDonald

                                     /s/ Robert S. Fore
                                     ------------------------------------------
                                     Robert S. Fore

                                     LEE CAPITAL HOLDINGS

                                     By: /s/ O. Lee
                                        ---------------------------------------
                                     Name: O. Lee
                                     Title: President

                                     CITIZENS CAPITAL INCORPORATED

                                     By: /s/ Robert E. Garrow
                                        ---------------------------------------
                                     Name: Robert E. Garrow
                                     Title:President

                                     /s/ Joseph Murphy
                                     ------------------------------------------
                                     JOSEPH MURPHY

                                       6

Signature Page to Fifth Amendment to Fourth Amended and Restated Registration
Rights Agreement

<PAGE>
                                     DIGITAL BANDWIDTH LLC

                                     By:
                                        ---------------------------------------
                                     Name: David B. Weinberg
                                     Title: President

                                     INTEL CORPORATION

                                     By: /s/ Kala Srinivasan
                                        ---------------------------------------
                                     Name: Kala Srinivasan
                                     Title: Assistant Treasurer

                                     SAP AMERICA, INC.

                                     By:
                                        ---------------------------------------
                                     Name:
                                     Title:

                                     /s/ Paul Yovovich
                                     ------------------------------------------
                                     Paul Yovovich

                                     /s/ Ralph Mor
                                     ------------------------------------------
                                     Ralph Mor

                                     ------------------------------------------
                                     Hedva Mor

                                     ------------------------------------------
                                     Jeffrey Mor

                                     /s/ Jean Guy Dahan
                                     ------------------------------------------
                                     Jean Guy Dahan

                                     /s/ Naim Murad
                                     ------------------------------------------
                                     Naim Murad

                                     /s/ John Meyrick
                                     ------------------------------------------
                                     John Meyrick

                                     /s/ Brett Phaneuf
                                     ------------------------------------------
                                     Brett Phaneuf

                                       7

Signature Page to Fifth Amendment to Fourth Amended and Restated Registration
Rights Agreement

<PAGE>

                                     ------------------------------------------
                                     William J. O'Farrell

                                     ------------------------------------------
                                     Noreen D. O'Farrell

                                     ------------------------------------------
                                     William Ledingham

                                     /s/ William Haney
                                     ------------------------------------------
                                     William Haney

                                     /s/ Anne G. Haney
                                     ------------------------------------------
                                     Anne G. Haney

                                     LIGHTHOUSE CAPITAL PARTNERS, L.P.

                                     By: LIGHTHOUSE MANAGEMENT
                                         PARTNERS, L.P., its general partner

                                     By: LIGHTHOUSE CAPITAL
                                         PARTNERS, INC., its general partner

                                     By:
                                        ---------------------------------------
                                     Title:
                                            -----------------------------------

                                     /s/ Mark Holthouse
                                     ------------------------------------------
                                     Mark Holthouse

                                     /s/ Stephen Smith
                                     ------------------------------------------
                                     Stephen Smith

                                     /s/ Sol Lerner
                                     ------------------------------------------
                                     Sol Lerner

                                     ------------------------------------------
                                     Henry Lerner

                                     /s/ Bernice F. Epstein, Trustee of
                                         Leonard Epstein Revocable Trust
                                     ------------------------------------------
                                     Leonard Epstein Revocable Trust

                                       8

Signature Page to Fifth Amendment to Fourth Amended and Restated Registration
Rights Agreement

<PAGE>

                                     ------------------------------------------
                                     Bella Lerner

                                     ------------------------------------------
                                     Miriam Epstein

                                     /s/ Brian S. Eberman
                                     ------------------------------------------
                                     Brian S. Eberman

                                     /s/ Edward J. McCaffrey
                                     ------------------------------------------
                                     Edward J. McCaffrey

                                     /s/ Joyce V. McCaffrey
                                     ------------------------------------------
                                     Joyce V. McCaffrey

                                     INTERVOICE-BRITE, INC.

                                     By: /s/ Rob Roy J. Graham
                                        ---------------------------------------
                                     Name: Rob Roy J. Graham
                                     Title: CFO

                                       9

Signature Page to Fifth Amendment to Fourth Amended and Restated Registration
Rights Agreement

<PAGE>

                           SCHEDULE RRA (5TH REVISED)
                                 January 5, 2001

INVESTORS AND MAILING ADDRESSES:
-------------------------------

Dr. Susan Hertz
24 Highgate Circle
Ithaca, NY  14850

Net2Phone, Inc.
171 Main Street
Hackensack, NJ  07601
Attn: General Counsel
Fax: (201) 530-4159

America Online, Inc.
22000 AOL Way
Dulles, Virginia  20166
Attn: General Counsel

AT&T Corp.
295 North Maple Avenue
Basking Ridge, NJ  07920

iGate Ventures I, L.P.
1004 McKee Road
Oakdale, PA 15071

Reuters Holdings Switzerland SA
153 Route de Thonon
1245 Collogne-Bellerive
Switzerland
(with copies to: Reuters Limited
85 Fleet Street
London EC4P 4AJ
United Kingdom
Attention: General Counsel)

Citicorp Strategic Technology Corp.
909 Third Avenue,
16th Floor, New York, NY 10043
Attention: William F. Carson

                                       10

<PAGE>

GE Capital Equity Investments, Inc.
120 Long Ridge Road, Stamford, CT 06927
Attention: General Counsel

MCI WorldCom Venture Fund, Inc.
1801 Pennsylvania Avenue N.W.
6th Floor
Washington D.C. 20006

Mintz Levin Investments LLC
One Financial Center
Boston, MA  02111
Attention: Steven P. Rosenthal, Esq.

Steven P. Rosenthal
40 Bartlett Street
Marblehead, MA  01945

Suzanne Abair & Kathleen MacDonald
130 Pembroke St. #1
Boston, MA 02118

Atlas Venture Fund II, L.P.
222 Berkeley Street
Boston, MA 02116
Attention: Axel Bichara

Charles River Partnership VII
1000 Winter Street
Suite 3300
Waltham, MA 02154
Attention:  Richard Burnes

Digital Bandwidth LLC
Bank One Plaza
21 South Clark Street, Suite 3140
Chicago, IL  60603
Attention: David B. Weinberg

                                       11

<PAGE>

Bank of America Ventures
950 Tower Lane, Suite 700
Foster City, CA  94404
Attention: Robert Obuch

BA Venture Partners III
950 Tower Lane, Suite 700
Foster City, CA  94404
Attention: Robert Obuch

Intel Corporation
5200 N.E. Elam Young Parkway
Hillsboro, OR  07123
Attention: Ken Matthews

SAP America, Inc.
3999 WestChester Pike
Newton Square,  PA 19073
Attention: Gary Fromer

QuestMark Partners, L.P.
One South Street, Suite 800
Baltimore, Maryland  21202
Attention: Tim Krongard

Riggs Capital Partners
800 17th Street, N.W.
Washington, DC  20006-3944
Attention: Vicken  Dombalagian

Intel 64 Fund Operations, Inc.
2200 Mission College Blvd.
Santa Clara, CA  95052
Attn: Portfolio Manager - M/S: RN6-46
With a copy to:
Intel Corporation
2200 Mission College Blvd.
Santa Clara, CA  95052
Attention:  General Counsel

Robert S. Fore
520 Georgetown Avenue
San Mateo, CA  94402

Edward J. and Joyce V. McCaffrey
23 Warwick Road
Winnetka, IL 60093

                                       12

<PAGE>

Paul Yovovich
Lake Capital
676 N. Michigan, Suite 3900
Chicago, IL 60611

Ralph Mor
11 Brook Road
Sharon, MA  02067

Hedva Mor
Rechov Hatziporen
6-Aleph
Bet Shemesh, ISRAEL 99000

Jeffrey Mor
Rechov Hatziporen
6-Aleph
Bet Shemesh, ISRAEL 99000

Jean Guy Dahan
12 Colburne Crescent, Apt. #3
Brookline, MA 02146

Naim Murad
75 Glengarry #502
Town of Mount Royal, PQ
H3R 1A2
Canada

John Meyrick
22 Lotus Avenue
Scituate, MA 02066

Brett Phaneuf
380 Pine Street
Marshfield, MA 02050

William J. O'Farrell
76 Taber Avenue
Providence, RI 02906

Noreen D. O'Farrell
76 Taber Avenue
Providence, RI  02906

William Ledingham
15 Wingate Road
Wellesley, MA 02181

                                       13

<PAGE>

William Haney
61 Lincoln Road
Wayland, MA 01778

Anne G. Haney
61 Lincoln Road
Wayland, MA 01778

Lighthouse Capital Partners, L.P.
500 Drake's Landing, Suite 260
Greenbrae, CA 94904-3121

Mark Holthouse
163 Upland Road
Newtonville, MA 02460-2420

Stephen Smith
4806 Jamestown Road
Bethesda, MD 20816

Sol Lerner
10 Flintlock Road
Sharon, MA 02067

Henry Lerner
One Celler Road
Edison, NJ

Leonard Epstein
193 Cheswick Road
Brighton, MA 02135

Bella Lerner
One Celler Road
Edison, NJ

Miriam Epstein
193 Chiswick Road
Brighton, MA  02135

Brian S. Eberman
10 LaFayette Road
Newton, MA 02162

                                       14

<PAGE>

Lee Capital Holdings, LLC
One International Place
Boston, MA 02110
Attn: Jonathan Lee

Citizens Capital Incorporated
28 State Street, 15th Floor
Boston, MA  02109
Attn: Robert Garrow

Joseph Murphy
40 Maynard Farm Road
Sudbury, MA  01776

Intervoice-Brite, Inc.
17811 Waterview Parkway
Dallas, TX 75252

                                       15

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