Document:

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                                                                   EXHIBIT 10.17

                                 AMENDMENT OF
            TECHNOLOGY, SERVICES AND LICENSE AGREEMENT ("Agreement")

     This Amendment of Technology, Services and License Agreement (this
"Amendment"), effective as of October 8, 1999 ("Effective Amendment Date"), is
entered into by and between pcOrder.com, Inc., a Delaware Corporation, having an
address at 5001 Plaza on the Lake, Suite 100, Austin, TX 78746 ("pcOrder") and
Trilogy Software, Inc., a Delaware Corporation, having an address at 6034 West
Courtyard Drive, Austin, Texas 78730 ("Trilogy").

                                    RECITALS

     WHEREAS, the parties (i.e. pcOrder and Trilogy) entered into the
Technology, Services and License Agreement dated September 1, 1998
("Agreement"); and

     NOW, THEREFORE, in consideration of the mutual covenants and promises
contained herein, the parties hereby agree to amend the Agreement as set forth
below.

                                   AMENDMENT

1.   In Schedule A, add the following.

     "Office Products E-Commerce Product" shall mean any network based
     electronic commerce product for enabling sales, purchasing, marketing, or
     distribution within the office products market, including but not limited
     to the markets for paper, envelopes, stationary, pens, pencils, binders,
     office furniture, office equipment (printer, copiers and facsimile
     machines), supplies for office equipment, discs, tapes and accessories for
     computer peripherals.

2.   In Schedule A, replace the definition of pcOrder Product in its entirety
with the following.

     "pcOrder Product" shall mean:

        (a) any product identified in Schedule E, in the forms (and versions)
thereof existing on or before the Effective Date;

        (b) Any other product of pcOrder (or any one or more of its Affiliates),
but only to the extent that such product is either (i) a Computer E-Commerce
Product or (ii) an Office Products E-Commerce Product; and

        (c) any other product of pcOrder but only to the extent approved in
writing by Trilogy on a case-by-case basis for a particular customer receiving a
particular product.

3.   In Section 1.2, add the following.

     Notwithstanding anything to the contrary in this Agreement, pcOrder shall
     have no obligation to give Trilogy access to (and shall have no obligation
     to disclose or deliver to Trilogy) any pcOrder Product that satisfies only
     subparagraph (b)(ii) in the definition of pcOrder Product in Schedule A,
     except to the extent that such product is a Computer E-Commerce Product.

4.   Payment

In addition to any and all payments otherwise due pursuant to the Agreement (as
amended herein), pcOrder shall pay Trilogy the sum of One Million Dollars
($1,000,000) within fifteen (15) days from execution of this Amendment.
<PAGE>

5.   By signing below and delivering this Amendment, each of the parties hereto
     acknowledge that:

        (a)  it has read, understands and agrees to this Amendment;

        (b)  this Amendment:

             (i)   is incorporated as a part of the Agreement,

             (ii)  shall not be effective for any purpose before the Effective
                   Amendment Date,

             (iii) is effective for all purposes as of and after the Effective
                   Amendment Date, notwithstanding any date of execution set
                   forth elsewhere in this Agreement,

             (iv)  amends, modifies and supersedes the provisions of the
                   Agreement to the extent of any inconsistencies therewith; and

         (c) except as expressly amended by this Amendment, the Agreement shall
             remain in full force and effect in accordance with its provisions.

pcOrder                              Trilogy

By: /s/ CHRISTINA C. JONES           By:  /s/ JOSEPH A. LIEMANDT
   ------------------------------       --------------------------------
Name: Christina C. Jones             Name: Joseph A. Liemandt

Title: President                     Title: President & Chief Executive Officer

Date: October 8, 1999                Date: October 8, 1999<PAGE>

                                                                   EXHIBIT 10.18

                             AVIVA PETROLEUM INC.

                            SEVERANCE BENEFIT PLAN

                             Amended and Restated
                       Effective as of December 31, 1999

<PAGE>

                             AVIVA PETROLEUM INC.

                            SEVERANCE BENEFIT PLAN

                                  WITNESSETH:

     WHEREAS, Aviva Petroleum Inc. previously adopted the Aviva Petroleum Inc.
Severance Benefit Plan and now desires to amend and restate the Plan;

     NOW, THEREFORE, the Aviva Petroleum Inc. Severance Benefit Plan is hereby
amended and restated effective as of December 31, 1999, to read as follows:

                                   ARTICLE I

                                  DEFINITIONS
                                  -----------

     1.1.  "Cause" means, in the context of an Employee's termination or
separation from employment with the Company, an Employee's (i) neglect, refusal
or failure (other than by reason of illness, accident or other physical or
mental incapacity), in any material respect, to attend to his duties as assigned
by the Company; (ii) failure in any material respect to comply with any of his
terms of employment; (iii) failure to follow the established, reasonable and
material policies, standards, and regulations of the Company; (iv) willful
engagement in gross misconduct injurious to the Company or to any of its
subsidiaries or affiliates; or (v) conviction in a court of law of, or pleading
of guilty or nolo contendere to, any crime that constitutes a felony in the
jurisdiction involved.

     1.2.  "Change of Control" means an event which shall be deemed to have
occurred when either (i) any "person" (as that term is used in sections 13(d)
and 14(d)(2) of the Securities Exchange Act of 1934, as amended (the "Exchange
Act")) becomes a "beneficial owner" (as defined in Rule 13d-3 of the Exchange
Act) directly or indirectly of securities of the Company representing 35% or
more of the combined voting power of the Company's then outstanding securities,
(ii) individuals who, as of the effective date of the Plan, constitute the
Directors cease for any reason to constitute at least a majority of the
Directors, unless such cessation is approved by a majority vote of the Directors
in office immediately prior to such cessation, (iii) the Company is merged into
a previously unrelated entity, or (iv) a transaction converting all or a part of
the debt of the Company and its subsidiaries to equity in the Company is
consummated with the Company's lenders or their successors.

     1.3.  "Code" means the Internal Revenue Code of 1986, as amended.

     1.4.  "Company" means Aviva Petroleum Inc.

     1.5.  "Directors" means the Board of Directors of the Company.

                                       1
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     1.6.  "Eligible Employee" means each Employee other than (a) an Employee
whose terms and conditions of employment are governed by a collective bargaining
agreement, unless such agreement provides for his coverage under the Plan, (b) a
nonresident alien who has no United States source income, (c) an Employee who is
a party to a separate severance agreement with the Company, or (d) an Employee
who is a party to an individual employment agreement with the Company providing
for severance benefits.

     1.7.  "Employee" means any individual who is employed full-time by the
Company (or any of its wholly-owned subsidiaries), and who is not a temporary
employee.  Full-time employees are those employees who, on average, work at
least 35 hours per week for the Company.  Temporary employees are those
employees whose anticipated duration of employment at the time of hire is no
more than six months.

     1.8.  "Plan" means the Aviva Petroleum Inc. Severance Benefit Plan, as
amended from time to time.

     1.9.  "Plan Administrator" means the Company.

     1.10. "Plan Year" means the twelve-consecutive-month period commencing
January 1 of each year.

                                  ARTICLE II

                           GENERAL SEVERANCE BENEFIT
                           -------------------------

     2.1.  Severance Benefit.  The Company shall provide severance benefits as
set forth in Article III to Eligible Employees, pursuant to the terms,
conditions and limitations set forth in the Plan.  No benefits shall be provided
to an Eligible Employee unless such Eligible Employee executes documents
required by the Plan Administrator relieving the Company from any employment-
related liability.

                                  ARTICLE III

                              SEVERANCE BENEFITS
                              ------------------

     3.1.  Severance Benefits.  Each Eligible Employee shall be entitled to
severance benefits under the Plan if, within two (2) years after a Change of
Control, the Company (or any of its wholly-owned subsidiaries) terminates his
employment, reduces his salary, removes him as an officer of the Company or
transfers the Eligible Employee to a location that is at least 50 miles from his
current employment location, or in any other circumstances in which the Plan
Administrator within its discretion deems severance benefits appropriate.  The
amount of an Eligible Employee's severance benefits shall be determined by the
Plan Administrator as follows:  Each Eligible Employee shall receive the greater
of (A) three (3) months' of his base salary or (B) one-half ( 1/2) month of his
base salary times his years of employment with the Company (or a predecessor
entity), plus one month's base salary multiplied by his annual base salary
divided by $10,000.  For purposes of this calculation, years of employment shall
be calculated to the nearest month.  Notwithstanding the

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immediately preceding two sentences, the severance benefits for an Eligible
Employee who is an officer of the Company shall be one year's base salary.

     In addition to eligibility to receive benefits following a Change of
Control, each Eligible Employee whose employment is terminated as a result of
the recommendations of management or the Directors, in connection with a
reduction of Company general and administrative expenses, shall be eligible to
receive the benefits provided under the first paragraph of this Section 3.1.

     3.2.  Voluntary Termination.  An Eligible Employee who voluntarily
terminates employment with the Company shall receive no severance benefits under
the Plan, unless the Plan Administrator deems severance benefits appropriate
pursuant to Section 3.1.

     3.3.  Termination for Cause.  Notwithstanding any other provision in the
Plan to the contrary, an Eligible Employee who is terminated for Cause shall
receive no severance benefits under the Plan.

     3.4.  Maximum Benefit.  The maximum benefit under the Plan for any Eligible
Employee shall be one-half ( 1/2) of the Eligible Employee's annual base salary,
except for officers of the Company.

     3.5.  Form of Benefit.  Benefits shall be paid in a lump sum.

     3.6.  Medical Benefits.  If an Eligible Employee becomes entitled to
severance benefits under Section 3.1, the Company shall also pay premiums for
medical insurance coverage for such Eligible Employee for a number of months
equal to the number of months of base salary the Eligible Employee receives as
severance benefits under Section 3.1, up to a maximum of three (3) months,
provided the Company is able to provide such medical insurance coverage under
the terms of its medical insurance policy.  The medical benefits provided under
such medical insurance coverage shall be substantially identical to the medical
benefits provided under the medical plan in effect on the date of the Change of
Control or, in the case of a termination in connection with a general reduction
of Company general and administrative costs, on the date of the termination of
employment.  If the Company is unable to provide such coverage under its medical
insurance policy, the Company shall pay the Eligible Employee the net dollar
amount that the Company had been paying toward the medical insurance premiums
for the Eligible Employee prior to the termination of employment.  Nothing in
the Plan shall be construed to limit the right of any Eligible Employee to any
benefits under the Consolidated Omnibus Budget Reconciliation Act of 1985, as
amended ("COBRA").

                                  ARTICLE IV

                              GENERAL PROVISIONS
                              ------------------

     4.1.  Funding and Cost of Plan.  The benefits provided herein shall be
unfunded and shall be provided from the Company's general assets.

     4.2.  Named Fiduciary.  The Plan Administrator shall be the named fiduciary
for purposes of the Employee Retirement Income Security Act of 1974, as amended.

                                       3
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     4.3.  Administration.  The Plan Administrator shall be responsible for the
management and control of the operation and the administration of the Plan,
including without limitation interpretation of the Plan, decisions pertaining to
eligibility to participate in the Plan, computation of Plan benefits, granting
or denial of benefit claims, and review of claims denials.  The Plan
Administrator has absolute discretion in the exercise of its powers and
responsibilities.  The Company may, by action of its President, delegate any or
all of its powers and responsibilities as Plan Administrator to an individual, a
committee, or both.  To the extent the Company delegates its responsibilities
and powers as Plan Administrator, the Company shall indemnify and hold harmless
each such delegate (and any other individual acting on such delegate's behalf)
against any and all expenses and liabilities arising out of such person's
administrative functions or fiduciary responsibilities, excepting only expenses
and liabilities arising out of the person's own willful misconduct; expenses
against which such person shall be indemnified hereunder include without
limitation the amounts of any settlement, judgment, attorneys' fees, costs of
court, and any other related charges reasonably incurred in connection with a
claim, proceeding, settlement, or other action under the Plan.

     4.4.  Amendment and Termination.  The Directors have the authority to amend
or terminate the Plan at any time, by means of a written instrument executed by
either the Directors or a duly authorized officer of the Company.
Notwithstanding the previous sentence, if the Company terminates an Eligible
Employee's employment, reduces his salary, removes him as an officer of the
Company, or transfers him to a location that is at least 50 miles from his
current employment location prior to December 31, 2001, no such amendment or
termination shall reduce the benefits to which the Eligible Employee would
otherwise be entitled, unless the Eligible Employee consents in writing to the
amendment or termination.

     4.5.  Claims Procedure and Review.  Claims for benefits under the Plan
shall be made in writing to the Plan Administrator.  If a claim for benefits is
wholly or partially denied, the Plan Administrator shall, within a reasonable
period of time but no later than ninety days after receipt of the claim (or 180
days after receipt of the claim if special circumstances require an extension of
time for processing the claim), notify the claimant of the denial.  Such notice
shall (i) be in writing, (ii) be written in a manner calculated to be understood
by the claimant, (iii) contain the specific reason or reasons for denial of the
claim, (iv) refer specifically to the pertinent Plan provisions upon which the
denial is based, (v) describe any additional material or information necessary
for the claimant to perfect the claim (and explain why such material or
information is necessary), and (vi) explain the Plan's claim review procedure.
Within sixty days of the receipt by the claimant of this notice, the claimant
may file a written appeal with the Plan Administrator.  In connection with the
appeal, the claimant may review pertinent documents and may submit written
issues and comments.  The Plan Administrator shall deliver to the claimant a
written decision on the appeal promptly, but not later than sixty days after the
receipt of the claimant's appeal (or 120 days after receipt of the claimant's
appeal if there are special circumstances which require an extension of time for
processing).  Such decision shall (i) be written in a manner calculated to be
understood by the claimant, (ii) include specific reasons for the decision, and
(iii) refer specifically to the Plan provisions upon which the decision is
based.  If special circumstances require an extension, up to 180 or 120 days,
whichever applies, the Plan Administrator shall send written notice of the

                                       4
<PAGE>

extension.  This notice shall indicate the special circumstances requiring the
extension and state when the Plan Administrator expects to render the decision.

     4.6.  Not Contract of Employment.  The adoption and maintenance of the Plan
shall not be deemed to be a contract of employment between the Company and any
person, to be consideration for the employment of any person, or to have any
effect whatsoever on the at-will employment relationship.  Nothing in the Plan
shall be deemed to give any person the right to be retained in the employ of the
Company or to restrict the right of the Company to discharge any person at any
time.  Nothing in the Plan shall be deemed to give the Company the right to
require any person to remain in the employ of such Company or to restrict any
person's right to terminate his employment at any time.

     4.7.  Governing Law.  This Plan shall be interpreted under the laws of the
State of Texas except to the extent preempted by federal law.

     4.8.  Gender; Number. Wherever appropriate herein, the masculine, neuter,
and feminine genders shall be deemed to include each other, and the plural shall
be deemed to include the singular and vice versa.

     4.9.  No Benefits. Notwithstanding any Plan provisions to the contrary, in
connection with the disposition of substantial stock or assets of the Company or
any affiliate, if the Eligible Employee commences employment with the entity or
any affiliate that acquired such stock or assets, no termination will be deemed
to have occurred and no benefits will be payable under the Plan.

     4.10. Independent Contractors.  Notwithstanding any provision of the Plan
to the contrary, no individual who is designated, compensated, or otherwise
classified as an independent contractor shall be eligible for benefits under the
Plan.

     4.11. Headings. The headings of the Articles and Sections are included
solely for convenience. If the headings and the text of the Plan conflict, the
text shall control. All references to Articles and Sections are to the Plan
unless otherwise indicated.

     4.12. Severability. If any provision of the Plan is held to be illegal or
invalid for any reason, that holding shall not affect the remaining provisions
of the Plan. Instead, the Plan shall be construed and enforced as if such
illegal or invalid provision had not been contained herein.

     4.13. Successors and Assigns. The provisions of this Plan shall be binding
on any successors to or assigns of the Company.

                                       5
<PAGE>

     IN WITNESS WHEREOF, Aviva Petroleum Inc., executed this amended and
restated  Aviva Petroleum Inc. Severance Benefit Plan, effective as of December
31, 1999, this 13th day of January 2000.

                                             AVIVA PETROLEUM INC.

                                             By: /s/ R. Suttill
                                                 -------------------------
                                             Name:  R. Suttill
                                                    ----------------------
                                             Title:  President & CEO
                                                     ---------------------

WITNESS:

By:  /s/ Mary Jane Baker
     -----------------------
Title:  Admin. Assistant
        --------------------

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