Document:

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                                                                   EXHIBIT 10.29

                       SEVENTH LOAN MODIFICATION AGREEMENT

      This Seventh Loan Modification Agreement (this "Loan Modification
Agreement") is entered into as of December 21, 2004, by and between SILICON
VALLEY BANK, a California-chartered bank, with its principal place of business
at 3003 Tasman Drive, Santa Clara, California 95054 and with a loan production
office located at One Newton Executive Park, Suite 200, 2221 Washington Street,
Newton, Massachusetts 02462, doing business under the name "Silicon Valley East"
("Bank") and ART TECHNOLOGY GROUP, INC., a Delaware corporation with its
principal place of business at 25 First Street, Cambridge, Massachusetts 02141
("Borrower").

1.    DESCRIPTION OF EXISTING INDEBTEDNESS AND OBLIGATIONS. Among other
      indebtedness and obligations which may be owing by Borrower to Bank,
      Borrower is indebted to Bank pursuant to a loan arrangement dated as of
      June 13, 2002, evidenced by, among other documents, a certain Amended and
      Restated Loan and Security Agreement dated as of June 13, 2002, between
      Borrower and Bank, as amended by a certain First Loan Modification
      Agreement dated as of September 27, 2002, as further amended by a certain
      Amendment dated as of October __, 2002, as further amended by a certain
      Second Loan Modification Agreement dated as of December 24, 2002, as
      further amended by a certain Third Loan Modification Agreement dated as of
      October 20, 2003, as further amended by a certain Fourth Loan Modification
      Agreement dated November 26, 2003, as further amended by a certain Letter
      Agreement dated June 16, 2004, as further amended by a certain Fifth Loan
      Modification Agreement dated June 30, 2004, and as further amended by a
      certain Sixth Loan Modification Agreement dated November 24, 2004 (as
      amended, the "Loan Agreement"). Capitalized terms used but not otherwise
      defined herein shall have the same meaning as in the Loan Agreement.

2.    DESCRIPTION OF COLLATERAL. Repayment of the Obligations is secured by the
      Collateral as described in the Loan Agreement (together with any other
      collateral security granted to Bank, the "Security Documents").

Hereinafter, the Security Documents, together with all other documents
evidencing or securing the Obligations shall be referred to as the "Existing
Loan Documents".

3.    DESCRIPTION OF CHANGE IN TERMS.

      Modifications to Loan Agreement.

            1.    The Loan Agreement shall be amended by deleting the following
                  text appearing in Section 2.4(e) thereof:

                        "(e) Compensating Balance/Compensating Balances Fees. In
                        the event, at any time, Borrower maintains less than
                        $25,000,000 in unrestricted cash (including, without
                        limitation, cash, cash equivalents and marketable
                        securities) with Bank, Borrower shall pay such fees and
                        expenses as Bank shall determine, in its sole and
                        exclusive discretion, to compensate Bank for its loss on
                        income on such deposit balance (the "Additional Fees")."

                  and inserting in lieu thereof the following:

                        "(e) Compensating Balance/Compensating Balances Fees. In
                        the event, at any time, Borrower maintains, at any time,
                        an amount less than two (2) times the

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                        amount of the outstanding Obligations, at any time, in
                        unrestricted cash (including, without limitation, cash,
                        cash equivalents and marketable securities) with Bank,
                        Borrower shall pay such fees and expenses as Bank shall
                        determine, in its sole and exclusive discretion, to
                        compensate Bank for its loss on income on such deposit
                        balance (the "Additional Fees")."

            2.    The Loan Agreement shall be amended by deleting the following
                  text, appearing in Section 6.7 thereof:

                        "(a) LIQUIDITY. Borrower shall have at all times, to be
                        tested as of the last day of each month, unrestricted
                        and unencumbered cash (including, without limitation,
                        cash, cash equivalents and marketable securities) equal
                        to or greater than $25,000,000.00.

                        (b) PROFITABILITY. Borrower shall have quarterly net
                        losses of not more than (i) $3,500,000.00 for the
                        quarter ending December 31, 2003; (ii) $3,000,000.00 for
                        the quarter ending March 31, 2004; (iii) $5,000,000.00
                        for the quarter ending June 30, 2004; (iv) $2,000,000.00
                        for the quarter ending September 30, 2004; (v)
                        $1,000,000.00 for each quarter thereafter"

                  an inserting in lieu thereof the following:

                        "(a) LIQUIDITY. Borrower shall have at all times, to be
                        tested as of the last day of each month, minimum
                        unrestricted and unencumbered cash (including, without
                        limitation, cash, cash equivalents and marketable
                        securities) in an amount equal to: (i) for the months
                        ending January 31, 2005, February 28, 2005, April 30,
                        2005 and May 31, 2005, the greater of (A) Fifteen
                        Million Dollars ($15,000,000.00) and (B) two (2) times
                        the amount of the Obligations, and (ii) ) for months
                        ending March 31, 2005 and June 30, 2005, and as of the
                        last day of each month thereafter Twenty Million Dollars
                        ($20,000,000.00).

                        (b) PROFITABILITY. Borrower shall have quarterly: (i)
                        net losses of not more than (A) $4,500,000.00 for the
                        quarter ending December 31, 2004; (B) $2,000,000.00 for
                        the quarter ending March 31, 2005; (C) $500,000.00 for
                        the quarter ending June 30, 2005; (D) $1,500,000.00 for
                        the quarter ending September 30, 2005; and (ii) net
                        profit of at least One Dollar ($1.00) for the quarter
                        ending December 31, 2005, and as of the last day of each
                        quarter thereafter."

            3.    The Loan Agreement shall be amended by deleting the following
                  definitions appearing in Section 13 thereof, in their
                  entirety:

                        ""GUARANTOR" is any present or future guarantor of the
                        Obligations, including Art Technology Group (Europe)
                        Limited.

                        ""OBLIGATIONS" are debts, principal, interest, Bank
                        Expenses and other amounts Borrower owes Bank now or
                        later, including letters of credit, cash management
                        services, and foreign exchange contracts, if any, and
                        including interest accruing after Insolvency Proceedings
                        begin and debts, liabilities, or obligations of Borrower
                        assigned to Bank."

                        "REVOLVING MATURITY DATE" is December 25, 2004."

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                  and inserting in lieu thereof the following:

                        ""GUARANTOR" is any present or future guarantor of the
                        Obligations, including but not limited to Primus
                        Knowledge Solutions, Inc."

                        ""OBLIGATIONS" are debts, principal, interest, Bank
                        Expenses and other amounts Borrower owes Bank now or
                        later, including letters of credit (including the
                        aggregate amount of undrawn letters of credit), cash
                        management services, and foreign exchange contracts, if
                        any, and including interest accruing after Insolvency
                        Proceedings begin and debts, liabilities, or obligations
                        of Borrower assigned to Bank."

                        "REVOLVING MATURITY DATE" is December 24, 2005."

4.    FEES. Borrower shall pay to Bank a modification fee equal to Seventy-Five
      Thousand Dollars and 00/100 ($75,000.00), which fee shall be due on the
      date hereof and shall be deemed fully earned as of the date hereof. The
      Borrower shall also reimburse Bank for all reasonable legal fees and
      expenses incurred in connection with this amendment to the Existing Loan
      Documents.

5.    RATIFICATION OF INTELLECTUAL PROPERTY SECURITY AGREEMENT. Borrower hereby
      ratifies, confirms and reaffirms, all and singular, the terms and
      conditions of a certain Intellectual Property Security Agreement dated as
      of June 13, 2002 between Borrower and Bank, and acknowledges, confirms and
      agrees that said Intellectual Property Security Agreement contains an
      accurate and complete listing of all Intellectual Property Collateral as
      defined in said Intellectual Property Security Agreement (with the
      exception of the Intellectual Property Collateral set forth on Schedule 5
      attached hereto) as of June 13, 2002 or any subsequent amendment thereto
      and shall remain in full force and effect.

6.    RATIFICATION OF PERFECTION CERTIFICATE. Borrower hereby ratifies, confirms
      and reaffirms, all and singular, the terms and disclosures contained in a
      certain Perfection Certificate dated as of June 13, 2002 between Borrower
      and Bank, and acknowledges, confirms and agrees the disclosures and
      information Borrower provided to Bank in said Perfection Certificate has
      not changed, as of the date hereof.

7.    CONSISTENT CHANGES. The Existing Loan Documents are hereby amended
      wherever necessary to reflect the changes described above.

8.    RATIFICATION OF LOAN DOCUMENTS. Borrower hereby ratifies, confirms, and
      reaffirms all terms and conditions of all security or other collateral
      granted to the Bank, and confirms that the indebtedness secured thereby
      includes, without limitation, the Obligations.

9.    NO DEFENSES OF BORROWER. Borrower agrees that, as of this date, it has no
      defenses against the obligations to pay any amounts under the Obligations.

10.   CONTINUING VALIDITY. Borrower understands and agrees that in modifying the
      existing Obligations, Bank is relying upon Borrower's representations,
      warranties, and agreements, as set forth in the Existing Loan Documents.
      Except as expressly modified pursuant to this Loan Modification Agreement,
      the terms of the Existing Loan Documents remain unchanged and in full
      force and effect. Bank's agreement to modifications to the existing
      Obligations pursuant to this Loan Modification Agreement in no way shall

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      obligate Bank to make any future modifications to the Obligations. Nothing
      in this Loan Modification Agreement shall constitute a satisfaction of the
      Obligations. It is the intention of Bank and Borrower to retain as liable
      parties all makers of Existing Loan Documents, unless the party is
      expressly released by Bank in writing. No maker will be released by virtue
      of this Loan Modification Agreement.

11.   COUNTERSIGNATURE. This Loan Modification Agreement shall become effective
      only when it shall have been executed by Borrower and Bank (provided,
      however, in no event shall this Loan Modification Agreement become
      effective until signed by an officer of Bank in California).

                  [Remainder of page intentionally left blank]

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      This Loan Modification Agreement is executed as a sealed instrument under
the laws of the Commonwealth of Massachusetts as of the date first written
above.

BORROWER:                        BANK:

ART TECHNOLOGY GROUP, INC.       SILICON VALLEY BANK, doing business as
                                 SILICON VALLEY EAST

By: /s/ Edward Terino            By: /s/ Michael D. Sinclair
    -------------------------        --------------------------------

Name: Edward Terino              Name: Michael D. Sinclair

Title: CFO                       Title: Vice President
          12/21/04

                                 SILICON VALLEY BANK

                                 By: /s/ Jacquelyne Le
                                     -------------------------------

                                 Name: Jacquelyne Le

                                 Title: Operations Supervisor
                                  (signed in Santa Clara County, California)<PAGE>

                                                                   EXHIBIT 10.32

                                  CONFIDENTIAL
                              SETTLEMENT AGREEMENT

      This Agreement, made by and among Primus Knowledge Solutions, Inc., a
Washington corporation having a principal place of business at 1601 Fifth
Avenue, Suite 1900, Seattle, WA 98101 ("Primus"), Art Technology Group, Inc, a
Delaware corporation having a principal place of business at 25 First Street,
Cambridge, MA 02141 ("ATG") and Serviceware Technologies, Inc., a Delaware
corporation having a principal place of business at One North Shore Centre, 12
Federal Street, Suite 503, Pittsburgh, PA 15212 ("Serviceware"),

                                WITNESSETH THAT:

      WHEREAS, Serviceware is the owner of U.S. Patent Nos. 5,787,234 and
5,797,135 (the "Asserted Patents");

      WHEREAS, Serviceware sued Primus for infringement of the Asserted Patents,
and Primus has asserted counterclaims against Serviceware and ServiceWare has
asserted certain reply claims against Primus, which claims and counterclaims are
now pending in the United States District Court for the Western District of
Pennsylvania (the "Court"), Civil Action No. 03-CV-1467 (the "Lawsuit");

      WHEREAS, the parties desire to resolve all claims and counterclaims
pending in the Lawsuit and all other claims each may have against the other
worldwide; and

      WHEREAS, in consideration of the agreement of Primus to make certain
payments and provide other consideration to Serviceware and to dismiss all its
counterclaims in the Lawsuit, Serviceware is willing to dismiss all its claims
and counterclaims in the Lawsuit and to grant a limited license to certain
intellectual property rights including the Asserted Patents, on the terms and
subject to the conditions set forth below.

      NOW, THEREFORE, in consideration of the above premises and the mutual
covenants and agreements hereinafter set forth, and for other good and valuable
consideration, the parties hereby agree as follows.

                                   DEFINITIONS

      1. "Licensee" shall mean Primus and its Affiliates (including, without
limitation, Art Technology Group, Inc.), and their respective legal
representatives, successors and permitted assigns.

      2. "Licensor" shall mean Serviceware and its legal representatives,
successors and assigns.

      3. "Patents" shall mean any and all patents, utility models, and
applications therefor of all countries of the world, which convey legally
enforceable rights in any country, and any foreign counterpart patents,
including any continuations, continuations-in-part, divisionals, reissues, or
reexaminations of such patents.

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      4. "Licensed Patent Rights" shall mean:

            (a) the Asserted Patents;

            (b) any Patents claiming priority to the Asserted Patents or to the
applications that resulted in the issuance of the Asserted Patents;

            (c) all Patents that as of the Effective Date are owned by
Serviceware or that Serviceware has the right to bring suit to enforce, other
than those identified in subsections (a) and (b) above, in whole or in part, at
any time, having as their earliest date of conception of any part of the
respective inventions claimed in any such Patents a date on or before the
Effective Date, that:

                        (1) have as their earliest effective filing date from
            any application upon which they do or can claim priority, a date on
            or prior to the Effective Date; or

                        (2) have as their earliest effective filing date from
            any application upon which they do or can claim priority, a date on
            or prior to the second anniversary of the Effective Date and claim a
            feature incorporated into any product or service made, used, sold,
            offered for sale or operated by Primus or ATG or of the same type or
            having the same general effect, purpose or market as any product or
            service made, used, sold, offered for sale or operated by Primus or
            ATG on or prior to the Effective Date; provided that

                        (3) Licensed Patent Rights shall not include any Patent
            that is acquired after the Effective Date by Licensor from any third
            party (other than an employee, contractor or consultant of
            Licensor), directly or indirectly, whether by purchase or license,
            or by way of a merger, joint venture or other business combination.

      5. "Licensed Products" shall mean any product or service developed by or
on behalf of Licensee and or offered for sale or license by Licensee, whether
now existing or later developed, the development, manufacture, use, sale, offer
for sale, license, publication, distribution, public display or performance of
which, absent the license granted to Licensee under this Agreement, would
infringe or contribute to the infringement of one or more Licensed Patent
Rights. Notwithstanding the foregoing, the term "Licensed Products" shall not
include any Acquired Product. The term "Acquired Product" shall mean any product
or service that was not developed by or for Licensee and that is acquired after
the Effective Date by Licensee, directly or indirectly, whether by purchase or
license, or by way of a merger, joint venture or other business combination
(other than the Merger contemplated hereby) to which Licensee is a party, or
otherwise if, immediately prior to such acquisition by Licensee, the
development, manufacture, use, sale, offer for sale, license, publication,
distribution, public display or performance of such product or service infringed
or contributed to the infringement of one or more Licensed Patent Rights.

      6. "Effective Date" shall mean the later of (a) the last date on which
this Agreement is signed by all of the parties whose signature is required at
the end of this Agreement, and (b) immediately prior to the Merger Effective
Time.

                                      -2-
<PAGE>

      7. "Affiliate" shall mean, with respect to a party to this Agreement, any
person or entity that now or hereafter directly or indirectly controls, is
controlled by, or under common control with such party.

      8. "Merger Agreement" shall mean the Agreement and Plan of Merger dated
August 10, 2004 among Primus, ATG and Autobahn Acquisition, Inc., a wholly owned
subsidiary of ATG, as the same may from time to time be amended by the parties
thereto.

      9. "Merger Effective Time" shall mean the time of filing with the
Secretary of State of the State of Washington of the Merger Agreement and
articles of merger with respect to the Merger.

                                      TERMS

I.    STIPULATION

      In consideration of the payments and other consideration described in
Section II below, Primus and Serviceware agree to have their respective counsel
sign and deliver, as specified in Section II, a joint stipulation providing for
immediate and consensual dismissal with prejudice of the Lawsuit in the form of
Attachment A (the "Joint Stipulation"). The parties agree jointly to move the
Court to maintain this Agreement and its terms under seal, and, pending the
Merger Effective Time or, if sooner, the expiration or termination of this
Agreement, to stay any proceedings in the Lawsuit, such motion to be in the form
of Attachment B hereto (the "Joint Motion"). Primus and Serviceware agree that
they will cooperate as reasonably necessary in filing with the Court any joint
motion or stipulation necessary to effect any of the provisions of this
paragraph.

II.   PAYMENT

      A. Without any admission of liability by either party, which each party
expressly denies, and in consideration of the licenses and the supporting
releases, covenants and stipulations contained in this Agreement, the parties
hereby agree that:

            1. As soon as practicable following the later of (a) approval and
      adoption by the stockholders of Primus of the Agreement and Plan of Merger
      relating to the Merger, and (b) approval by the stockholders of ATG of
      shares of its common stock pursuant to the Merger, and in any event not
      later than immediately prior to the Merger Effective Time:

                  (i) Serviceware and Primus will execute, and Primus will
            promptly thereafter cause to be filed with the Court, the Joint
            Stipulation and the Joint Motion;

                  (ii) Primus will deliver to Serviceware a letter setting forth
            the Exchange Ratio, as defined in Section 1.6(a)(ii) of the Merger
            Agreement;

                  (iii) Primus will issue and cause to be registered in book
            entry form in the name of Serviceware, that number of shares of the
            common stock, par value

                                      -3-
<PAGE>

            $0.025 per share, of Primus (rounded to the nearest whole share) as
            is equal to (i) the quotient of $850,000 divided by the ATG Share
            Price (as defined below), divided by (ii) the Exchange Ratio (the
            "Primus Shares"). For purposes of this paragraph, the "ATG Share
            Price" shall be an amount equal to the average of the last sale
            price of the common stock, par value $0.01 per share, of ATG ("ATG
            Common Stock") as reported by the Nasdaq Stock Market on each of the
            five trading days preceding the day on which the Merger Effective
            Time occurs, it being understood that it is the intent of the
            parties that upon the consummation of the Merger Serviceware will be
            entitled to receive shares of ATG Common Stock having an aggregate
            value (based upon the ATG Share Price) equal to $850,000; and

                  (iv) Primus will deliver to Serviceware its non-interest
            bearing promissory note in the amount of $800,000, payable as
            follows: $500,000 payable within five business days following the
            Merger Effective Date and $300,000 payable on January 3, 2005, in
            the form attached as Attachment C, accompanied by the unconditional
            guaranty of ATG relating thereto, in the form attached as Attachment
            D.

            2. Serviceware agrees that it will not directly or indirectly sell,
      transfer, assign, encumber, grant any option to purchase, or otherwise
      convey, any of the Primus Shares, or any shares of ATG Common Stock into
      which such Primus Shares shall have been converted by operation of the
      Merger (the "ATG Shares"), or any interest therein, or offer or agree to
      do any of the foregoing (each, collectively, a "Transfer"), at any time
      after the date of this Agreement, to and including the second business day
      following the date on which ATG has filed with the Securities and Exchange
      Commission a Current Report on Form 8-K with respect to a press release
      announcing on a definitive basis ATG's results of operations for the three
      months ended December 31, 2004, but in no event later than February 28,
      2005 (the "Restricted Period"). After the Restricted Period has elapsed,
      Serviceware may effect Transfers of ATG Shares; provided, that Serviceware
      agrees that the number of ATG Shares subject to such Transfers in any
      calendar week shall not exceed 50,000 (such number to be adjusted
      appropriately to reflect any stock split, stock dividend, reclassification
      or other similar event affecting the ATG Common Stock). Serviceware
      acknowledges and agrees that any stock certificate issued to represent any
      Primus Shares or ATG Shares issuable hereunder shall bear a transfer
      legend consistent with the above, and Serviceware consents to the entry
      with the transfer agent for each of Primus and ATG of stop transfer
      instructions consistent with the above. Except as set forth above, no
      certificate issued to represent any ATG Shares issuable hereunder shall
      bear any other legend restricting its transfer. There shall be no further
      restrictions on Transfer of the ATG Shares (other than as provided by
      applicable law) after the second business day following the date on which
      ATG has filed with the Securities and Exchange Commission a Current Report
      on Form 8-K with respect to a press release announcing on a definitive
      basis ATG's results of operations for the three months ended March 31,
      2005, but in no event late than May 15, 2005 (the "Transfer Restriction
      Termination Date". At the request of Serviceware after the Restricted
      Period and prior to the Transfer Restriction Termination Date, ATG will
      use its reasonable efforts, as may be permitted by law, to assist
      Serviceware in identifying a prospective

                                      -4-
<PAGE>

      purchaser for a privately negotiated sale of 10,000 or more shares of ATG
      common stock ("a block trade") Any block trade so arranged shall not count
      against the 50,000 share per week limit referred to above. Primus
      represents and warrants that the Primus Shares, if issued prior to the
      Merger Effective Time as contemplated hereby, will by operation of the
      Merger be converted to ATG Shares at the exchange ratio specified in the
      Merger Agreement, and that the issuance of such ATG Shares has been
      registered by ATG in a registration Statement on Form S-4 that has been
      declared effective by the Securities and Exchange Commission.

            3. Notwithstanding anything herein to the contrary, if the Merger
      Effective Time shall not have occurred by the close of business on
      November 30, 2004 or such later date as may be mutually agreed upon by the
      parties, this Agreement and the settlement obligations contemplated hereby
      shall be a nullity and of no force and effect.

III.  RELEASE

      A. Subject to the terms and conditions of this Agreement, and effective as
of the Effective Date, Licensor, on behalf of itself and its directors, officers
and employees, agrees to release and waive any and all claims and causes of
action of any nature, and expressly waives and agrees not to bring any suit or
other legal proceeding making any claim, whether in law or in equity, whether
known or unknown, discoverable or undiscoverable, fixed or contingent, arising
in any way, in whole or in part, on or before the Effective Date, which Licensor
now has, had or may have, against:

            1. Licensee and any of its directors, officers, employees,
      consultants or agents (the "Licensee-Related Entities"), for any matter
      whatsoever, whether involving intellectual property rights or any other
      civil claim; or

            2. any direct or indirect customer, end user, value added reseller,
      OEM, sales agent, distributor, dealer, application service provider,
      outsourcer, supplier or other person or entity involved in a similar
      capacity in the marketing, distribution or sale of Licensee's products and
      services arising out of or in connection with the manufacture, use, sale,
      offer for sale, sublicense, public display or performance by any such
      person or entity of any product or service of Licensee which constitutes a
      Licensed Product or is otherwise alleged to infringe any intellectual
      property rights of Licensor.

      B. Subject to the terms and conditions of this Agreement, and effective as
of the Effective Date, each of Primus and ATG agrees, on behalf of itself and
its directors, officers and employees, to release and waive any and all claims
and causes of action of any nature, and expressly waives and agrees not to bring
any suit or other legal proceeding making any claim, whether in law or in
equity, whether known or unknown, discoverable or undiscoverable, fixed or
contingent, arising in any way, in whole or in part, on or before the Effective
Date, which Primus or ATG or any of their directors, officers and employees now
have, had or may have, against Licensor and Licensor's directors, officers,
employees, consultants and agents for any matter whatsoever, whether involving
intellectual property rights or any other civil claim.

                                      -5-
<PAGE>

      C. In making the releases in Sections III.A and III.B, Licensor, on the
one hand, and Primus and ATG, on the other hand, recognize that they may be
waiving valuable rights against the other(s) unknown to them at this time, but
knowingly and willingly do so as part of this Agreement between them.

      D. Except as expressly warranted in Section V.A hereof, should any portion
of the releases and waivers of Section III.A and III.B be determined
ineffective, limited or conditional for any reason, the parties agree,
separately and independently of any other provision of this Agreement, to waive
and surrender all remedies that might otherwise be available to any party
arising from such determination.

      E. The parties each acknowledge that there is risk that after the
Effective Date, one of them will discover, incur or suffer claims arising in any
way, in whole or in part, on or before the Effective Date, that were unknown or
unanticipated as of the Effective Date (collectively, the "Unknown Claims"),
including, without limitation, Unknown Claims that, had they been known on the
Effective Date, may have materially affected the decision to enter into this
Agreement; nonetheless, the parties desire to execute this Agreement and to
hereby waive, relinquish and discharge any and all Unknown Claims, and waive,
relinquish and discharge any and all rights either may have with respect to any
Unknown Claims.

IV.   LICENSE AND COVENANT NOT TO SUE

      A. Subject to the terms and conditions of this Agreement Licensor hereby
grants to Licensee a fully paid-up, irrevocable, nonexclusive, nontransferable
(except to the extent provided in Section V.I below), worldwide, perpetual
limited license under the Licensed Patent Rights, including, without limitation,
the right to practice the methods claimed therein to develop, manufacture, use,
sell, offer for sale, sublicense (to the extent provided in Section IV.B below),
publish, distribute, publicly display or perform any products or services of
Licensee that constitute Licensed Products, subject to any and all limitations
and restrictions set forth herein.

      B. Licensee shall have the limited right to grant sublicenses, consistent
with and subject to the terms and conditions of this Agreement, to its direct or
indirect customers, end users, value added resellers, OEMs, sales agents,
distributors, dealers, application service providers, outsourcers, suppliers or
other persons or entities that are involved in the development, manufacture,
marketing, distribution or sale by or for Licensee of its products and services
that constitute Licensed Products, to the extent, and only to the extent,
necessary to enable such sublicensees to develop, manufacture, use, sell, offer
for sale, incorporate in their own products or services, sublicense, publish,
distribute, publicly display or perform any products or services of Licensee
that constitute Licensed Products. Licensor shall not be entitled to receive any
additional license fee or other consideration in respect of any such sublicense.
Nothing in this paragraph shall be deemed to authorize Licensee to grant any
sublicense other than in connection with the development, marketing and
distribution by Licensee of its own products and services that constitute
Licensed Products, whether on a stand-alone basis or incorporated in products
and services of Licensee's value added resellers, OEMs or other persons or
entities involved in similar capacities in the marketing, distribution or sale
by or for Licensee of its products and services that constitute Licensed
Products.

                                      -6-
<PAGE>

      C. Licensee acknowledges and agrees that Licensor is and shall remain the
exclusive owner of all right, title and interest in and to the Licensed Patent
Rights and that Licensee acquires no rights in or to the Licensed Patent Rights
other than the license rights specifically granted herein.

      D. Licensor hereby irrevocably covenants under the Licensed Patent Rights
never to sue for infringement, whether direct, induced, indirect or
contributory, either (i) Licensee or (ii) any of Licensee's direct or indirect
customers, end users, value added resellers, OEMs, sales agents, distributors,
dealers, application service providers, outsourcers, suppliers or other persons
or entities that are involved in the development, manufacture, marketing,
distribution or sale by Licensee of its products and services that constitute
Licensed Products, to the extent that such infringement or alleged infringement
arises out of or in connection with the development, manufacture, use, sale,
offer for sale, sublicense, publication, distribution, public display or
performance by Licensee or any such person or entity of any product or service
which constitutes a Licensed Product. Nothing in this paragraph shall be deemed
to prevent Licensor from seeking any legal remedy otherwise available to it in
the event of any breach by Licensee of any of its obligations under this
Agreement or any claim for infringement unrelated to the Licensed Patent Rights.

      E. The licenses and covenant not to sue provided for herein shall be
irrevocable provided that the consideration described in Section II is paid in
full when due, notwithstanding any breach or alleged breach by Licensee of any
other term or provision of this Agreement.

      F. Licensor further agrees to impose the covenants of this Section IV on
any third party to whom Licensor may assign or otherwise transfer any of the
Licensed Patent Rights.

V.    WARRANTIES AND REPRESENTATIONS

      A. Serviceware and Primus each hereby represent and warrant that they have
not transferred, conveyed, pledged, assigned or made any other disposition of
the rights, actions, causes of action, liabilities, obligations, claims or any
other matter released in this Agreement. Serviceware and Primus each represents
and warrants that it does not have any contractual obligations to any third
party which would conflict or interfere with its obligations under this
Agreement, and that each has the full right to grant the releases and licenses
referred to in this Agreement.

      B. Serviceware represents that, as of the Effective Date, to Serviceware's
knowledge, no third party has asserted any claim of ownership adverse to that of
Serviceware in or to the Asserted Patents or any other Licensed Patent Rights.

      C. Serviceware represents and warrants that, as of the Effective Date,
other than the Asserted Patents, it does not own any right, title or interest in
and to any Patents or patent applications of any kind that are known or believed
by Serviceware to claim a feature incorporated into any product or service made,
used, sold, offered for sale or operated by Primus or ATG, or of the same type
or having the same general effect, purpose or market as any product or service
made, used, sold, offered for sale or operated by Primus or ATG on or prior to
the Effective Date.

                                      -7-
<PAGE>

      D. Serviceware represents and warrants that it has the full right and
power to grant any and all licenses which they have granted herein, that there
are no outstanding agreements, assignments, or encumbrances inconsistent with
the provisions of said licenses, and that no other party has made any claim of
ownership or title to any of the Licensed Patent Rights.

      E. All licenses and immunities granted by Licensor in this Agreement shall
be binding upon any successor in ownership or control of Licensor, or successor
of Licensor in ownership or control of any of the Licensed Patent Rights.

      F. Nothing contained in this Agreement shall be construed as:

            1. a warranty or representation by any of the parties to this
      Agreement as to the validity, infringement, or scope of the Licensed
      Patent Rights; or

            2. an obligation to furnish any technical assistance, information,
      documentation, materials or know-how of any kind, including, without
      limitation, any trade secrets, software programs or code.

      G. EXCEPT FOR THE EXPRESS WARRANTIES CONTAINED IN THIS SECTION V, LICENSOR
MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND, WHETHER EXPRESS, IMPLIED, OR
ARISING BY CUSTOM OR TRADE USAGE, WITH RESPECT TO THE LICENSED PATENT RIGHTS OR
ANY RIGHTS GRANTED HEREUNDER OR OTHERWISE IN CONNECTION WITH THIS AGREEMENT.
WITHOUT LIMITING THE FOREGOING, LICENSOR HEREBY EXPRESSLY DISCLAIMS ANY EXPRESS
OR IMPLIED WARRANTY OR REPRESENTATION (i) AS TO THE VALIDITY OR SCOPE OF ANY OF
THE CLAIMS OF THE LICENSED PATENT RIGHTS, (ii) THAT THE LICENSED PRODUCTS OR THE
MANUFACTURE, MARKETING, SALE, DISPOSITION OR USE THEREOF, OR ANY ACTIVITIES OF
LICENSEE CONTEMPLATED BY THIS AGREEMENT, WILL BE FREE FROM INFRINGEMENT OF ANY
PATENT, COPYRIGHT, TRADEMARK OR OTHER RIGHTS OF ANY THIRD PARTY, (iii) TO
ENFORCE THE LICENSED PATENT RIGHTS AGAINST ANY THIRD PARTY OR TO BRING OR
PROSECUTE ACTIONS OR SUITS AGAINST ANY THIRD PARTY FOR INFRINGEMENT OF THE
LICENSED PATENT RIGHTS OR TO CONFER ANY SUCH RIGHT, (iv) TO FILE OR PROSECUTE IN
ANY COUNTRY ANY PATENT APPLICATION OR TO MAINTAIN ANY PATENT APPLICATION OR
PATENT IN FORCE, OR (v) OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE

      H. Other than as required by law, Licensee shall not seek to invalidate or
render unenforceable any of the Licensed Patent Rights, and shall not itself,
and shall use its best efforts to ensure that no director, officer, employee of
Licensee, or any consultant, agent or other person subject to the control of
Licensee shall, provide material assistance to any third party in any proceeding
by such third party seeking to invalidate or render unenforceable any of the
Licensed Patent Rights.

      I. This Agreement, and the releases, licenses, immunities, warranties and
covenants provided for herein, shall be binding upon and shall inure to the
benefit of the successors-in-interest of the parties (including, without
limitation, the surviving corporation in any merger or

                                      -8-
<PAGE>

other business combination to which such party may be a party), and the
permitted assigns of the respective parties. Licensee may, upon prior notice to
Licensor, assign any of its rights under this Agreement to any person or entity
that is now or hereafter becomes an Affiliate of Licensee, or to any person or
entity that has acquired all or substantially all the assets associated with the
business now conducted by either Primus or ATG or hereafter conducted by
Licensee. Licensee shall promptly provide to Licensor any documents reasonably
requested by Licensor to evidence the assignee's agreement to be bound by the
terms hereof.

      J. In the event of any alleged breach of any provisions of this Agreement,
the non-breaching party shall provide, before exercising any of its rights under
this Agreement, at law or in equity, the breaching party with written notice
specifying the alleged breach and requiring its remedy and an opportunity to
cure the alleged breach within thirty (30) days of the receipt by the breaching
party of such notice.

VI.   CONFIDENTIALITY

Licensor and Licensee agree that they shall, and shall cause their respective
directors, officers, employees, consultants and agents to, keep the existence
and terms of this Agreement confidential and shall not now nor hereafter divulge
the same or any part thereof to any third party except: (a) with the prior
written consent of the other party, executed by an executive officer of such
party; (b) to any governmental body or judicial entity having jurisdiction and
calling therefor; (c) as otherwise may be required by law, including any rule or
regulation of the Securities and Exchange Commission; (d) to potential acquirors
or acquisition candidates of Licensor in connection with the due diligence
process in respect of a potential business combination involving Licensor,
subject to a written confidentiality agreement consistent with this paragraph;
or (e) to legal counsel, financial advisors, investment bankers and potential
financing sources for either party, in each case subject to an express
confidentiality agreement consistent with this paragraph. Disclosure to any
person of any information which is, or has become, in the public domain, other
than by reason of a breach by the disclosing party of its obligations hereunder,
shall not be prohibited by this paragraph. Not less than two business days'
prior notification of any disclosure pursuant to clause (b) above shall be
provided by the disclosing party to the non-disclosing party. The parties agree
that if any of them should conclude that this Agreement constitutes a material
definitive agreement not made in the ordinary course of business of such party,
within the meaning of Item 1.01 of Form 8-K promulgated by the Securities and
Exchange Commission (a "material agreement"), such that disclosure pursuant to
clause (c) above is required, then the disclosure made by such party in response
to Item 1.01 shall be substantially as set forth on Attachment E hereto. All
reasonable efforts to preserve the confidentiality of the terms of this
Agreement shall be expended by the disclosing party when complying with such an
order or requirement of law, including, without limitation, reasonable
cooperation with any efforts by the disclosing party to obtain a protective
order; provided, that any reasonable, out-of-pocket costs incurred by a
disclosing party in providing such cooperation shall be borne by the party
sought to be protected. Without limiting the generality of the foregoing, in the
event that any party shall conclude that this Agreement is a "material
agreement" required to be filed as an exhibit to any current or periodic report
filed by such party with the Securities and Exchange Commission, the disclosing
party shall use its reasonable efforts, in cooperation with the other parties,
to obtain from the Staff of the Commission confidential treatment of this
Agreement as so filed, to the extent available under

                                      -9-
<PAGE>

applicable law. Nothing in this Section VI shall preclude Licensee from
disclosing in confidence to any actual or potential customer, end user, value
added reseller, OEM, sales agent, distributor, dealer, application service
provider, outsourcer, supplier or other person or entity involved in a similar
capacity in the marketing, distribution or sale of Licensee's products and
services all or part of the contents of this Agreement to the extent required by
the conduct of their respective normal business operations. Nothing in this
Section VI shall preclude Licensor from disclosing to any third party (aa) any
fact or statement disclosed publicly by Licensee regarding the subject matter of
this Agreement, or (bb) that the parties settled the Lawsuit and that, while
denying liability, Primus obtained a license under the Asserted Patents as part
of the settlement, provided that the text of any disclosure by Licensor of the
type specified in the foregoing clause (bb) and not otherwise authorized under
this paragraph shall be subject to the prior written approval of Licensee, which
approval will not unreasonably be withheld or delayed. In no event shall
Licensor state publicly that Licensee has used or is using any software or other
technology of Licensor, in that the license to the Licensed Patent Rights
hereunder is only taken in settlement of the Lawsuit. In no event shall Licensee
use the name or any trademark or service mark of Licensor in its marketing and
sales efforts or otherwise state that the products of Licensee incorporate or
include, in whole or in part, any software products, software code or other
technology of Licensor. Notwithstanding the foregoing, Licensee may state that
that the parties settled the Lawsuit and that, while denying liability, Primus
obtained a license under the Licensed Patent Rights as part of the settlement.

VII.  NO ADMISSION

      By signing this Agreement, Primus does not stipulate or concede to any
infringement, validity or enforceability of the Asserted Patents. The parties
agree that the amount payable by Primus hereunder does not necessarily reflect
the value of the Asserted Patents, and reflects in part both parties'
willingness to resolve a legal dispute. Each party agrees that this Agreement
should not be used as evidence of current or future liability or of its amount,
if any, or to set a licensing rate or substantiate the validity or
enforceability of the Asserted Patents.

VIII. ADDITIONAL TERMS

      A. Applicable Law. This Agreement shall be construed and the legal
relations created herein between the parties shall be determined in accordance
with the substantive laws of the State of Delaware (other than its principles of
choice of laws), which pertain to agreements executed in, and fully performed
within, the State of Delaware. Each party agrees to accept service of process by
registered mail addressed to its representative as indicated in Section IX.

      B. Counterparts. This Agreement may be executed in one or more
counterparts (including multiple signature pages), and may be signed and
exchanged by facsimile, all of which counterparts shall be deemed to be one
instrument, and the Agreement deemed to have the same effect as if all parties
have signed the same Agreement.

      C. Entire Agreement. This Agreement constitutes the final and entire
agreement and understanding between the parties pertaining to the subject matter
contained herein, and supersedes all prior and contemporaneous representations
and understandings that may have

                                     -10-
<PAGE>

arisen in the course of the discussions and negotiations that preceded the
execution of this Agreement. Licensor and Licensee warrant and represent that
they are not relying upon any oral or written representation or statement made
by the other party (or the agents of the other party, including counsel), except
to the extent that such representations or statement are contained in this
Agreement.

      D. Survivability. Should any clause, sentence, paragraph, or provision of
this Agreement judicially be declared to be invalid, unenforceable, or void in
any respect, such decision shall not have the effect of invalidating, rendering
unenforceable, or voiding the remainder of this Agreement. The parties agree
that the part or parts of this Agreement so held to be invalid, unenforceable or
void shall be deemed to have been stricken, and the remainder shall have the
same force and effect as if such part or parts had never been included herein,
so long as the remainder of the Agreement still expresses the intent of the
parties. If the intent of the parties cannot be preserved, this Agreement shall
be either renegotiated or terminated.

      E. Modifications. No oral explanation or oral information by either party
hereto shall alter the meaning or interpretation of this Agreement. No
modification, alteration, addition or change in the terms hereof shall be
binding on either party unless made after the Effective Date and reduced to
writing and executed by a duly authorized representative of each party.

      F. No Implied Consent. Failure by either party to insist in any instance
upon strict conformance to any term herein, or failure by either party to act in
the event of a breach or defaults shall not be construed as a consent to or
waiver of that breach or defaults or any subsequent breach or default of the
same or of any other term contained herein.

      G. Headings. The headings of the several sections are inserted for
convenience of reference only and are not intended to be a part of or to affect
the meaning or interpretation of this Agreement.

      H. Drafting. Each party actively participated in the drafting of this
Agreement. Therefore, any ambiguity in the terms of the Agreement should not be
construed against either party as the primary drafter of the Agreement.

      I. Costs and Fees. Each party will bear its own costs and attorney's fees
incurred to date in connection with this Agreement and the above-mentioned
Lawsuit

      J. Protective Order. The parties intend that any protective order or other
order entered in the Lawsuit protecting the confidentiality of any information
filed with or submitted to the Court shall remain in place and survive the
execution and delivery of this Agreement. Neither party shall be deemed, by
entering into this Agreement, to have waived or released any obligation of the
other party, or any prior breach, known or unknown, by such party, under any
such protective order.

IX.   DISPUTES

      A. Except as otherwise provided in the note and guaranty referred to in
Section II.A.1.iv above with respect to any dispute relating thereto, any
controversy or claim between Licensor and Licensee arising out of or relating to
this Agreement shall be resolved by binding

                                     -11-
<PAGE>

arbitration in accordance with the Commercial Arbitration Rules of the American
Arbitration Association, except that the arbitrators will be paid their normal
professional or expert consultation fees (such fees shall be divided equally and
paid by the parties, except as set forth below); provided that in conducting any
such arbitration the arbitrators shall apply and adhere to the laws of the State
of Delaware, including the laws of evidence of such State. Arbitration shall be
conducted in Wilmington, Delaware, before a panel of three neutral arbitrators.
With respect to any arbitration proceeding initiated pursuant to this Section,
the evidentiary hearing shall commence no later than 120 calendar days after the
filing of a demand for arbitration; thereafter, arbitration shall be completed
within 60 calendar days, and the arbitration award shall be rendered no later
than 30 days after the completion of the evidentiary hearings. The parties shall
exert their best efforts to obtain strict compliance with the schedule set out
above; provided that failure to adhere to such schedule will not terminate a
party's right to obtain arbitration pursuant to this section. The arbitration
award shall be in writing and shall specify the factual and legal bases for the
award. The arbitration award, and any judgment entered thereon, shall be subject
to judicial review by the federal courts in Delaware for purposes of ensuring
compliance with this section and arbitrator compliance with Delaware law

      B. The party that has substantially prevailed in any proceeding to
interpret or enforce this Agreement shall be entitled to recover from the other
party its reasonable attorneys' fees and disbursements and costs of such
proceeding (including, without limitation, the prevailing party's share of the
arbitrators' fees and expenses).

X.    COMMUNICATIONS

      All notices required or permitted to be given hereunder shall be in
writing and shall be deemed to have been duly given upon personal delivery five
(5) days after being mailed by registered or certified mail, return receipt
requested, or one (1) business day after being sent by nationally recognized
overnight courier with established tracking capability, addressed as follows:

      If to LICENSOR:         ServiceWare Technologies, Inc.
                              One North Shore Centre
                              12 Federal Street, Suite 503
                              Pittsburgh, PA 15212

                              Attention: Kent Heyman, Chief Executive Officer
                              Fax: (412)222-4453

      With a copy to:         Gallagher & Kennedy P.A.
                              2575 East Camelback Road
                              Phoenix, AZ 85016-9225
                              Attention: John Kerkorian
                              Fax: (602) 530-8500

                              Cozen O'Connor
                              1900 Market Street

                                  -12-
<PAGE>

                              Philadelphia, PA 19103
                              Attention: James E. Brown
                              Fax: (215) 665-2013

      If to LICENSEE:         Primus Knowledge Solutions, Inc.
                              1601 Fifth Avenue, Suite 1900
                              Seattle, WA 98101
                              Attention: General Counsel
                              Fax: (206) 834-8111

      With a copy to:         Art Technology Group, Inc.
                              25 Main Street
                              Cambridge, MA 02141
                              Attention: Chief Executive Officer
                              Fax: (617) 386-1111

                              Foley Hoag LLP
                              Seaport Work Trade Center West
                              155 Seaport Boulevard
                              Boston, MA 02210
                              Attention: John D. Patterson, Jr.

                                         Robert W. Sweet, Jr.
                              Fax: (617) 832-7000

Either party may change its address by a notice given to the other party in the
manner set forth above.

                                     -13-
<PAGE>

      WHEREFORE, the parties hereby acknowledge their agreement and consent to
the terms and conditions set forth above through their respective signatures as
contained below:

                              SERVICEWARE TECHNOLOGIES, INC.

                              By: /s/ Kent Heyman
                                 -------------------------------
                                 Its: President/CEO

                              PRIMUS KNOWLEDGE SOLUTIONS, INC.

                              By: /s/ Michael A. Brochu
                                 -------------------------------
                                 Its: CEO and President

                              ART TECHNOLOGY GROUP, INC.

                              By: /s/ Robert D. Burke
                                 -------------------------------
                                 Its: President and CEO

                                     -14-

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