Document:

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                                                                   Exhibit 10.51

                               SECURITY AGREEMENT
                                  (Subsidiary)

         In consideration of financial accommodations (arising from any
guarantee, loan, advance, letter of credit, acceptance and/or other credit
transactions) given or to be given or to be continued to the undersigned (the
"Debtor") or to any other party(ies) at the request, or for the benefit, or upon
the undertaking, of the Debtor by EXCEL BANK, N.A., its successors or assigns
(together with its affiliates and subsidiaries, herein called the "Bank"), the
Debtor hereby agrees with the Bank that, whenever the Debtor shall be at any
time or times directly or contingently indebted, liable or obligated to the Bank
in any manner whatsoever, the Bank shall have the following rights and the
Debtor shall have the following obligations:

     1. As security for the due and punctual payment of any and all of the
present and future Obligations of the Debtor (as defined in Section 2 below),
the Debtor hereby assigns, mortgages, pledges, hypothecates, transfers, sets
over and grants to the Bank a first lien on and security interest in (a) all of
the Collateral (as defined in Section 3 below), whether now or hereafter
existing or acquired, and (b) all present and future products and proceeds of
the Collateral.

     2. As used herein, the term "Obligations" means all indebtedness,
liabilities or obligations, absolute or contingent, joint, several or
independent, of the Debtor now or hereafter existing, due or to become due to,
or held or to be held by, the Bank for its own account or as agent for another
or others, whether created directly or acquired by assignment or otherwise and
howsoever evidenced.

     3. As used herein, the term "Collateral" means the property described
below together with the property described in Section 4 below:

    All Personal Property. All of the personal property and fixtures of the
    Debtor wherever located and whether now owned or in existence or hereafter
    acquired or created, of every kind and description, tangible or intangible,
    including without limitation all inventory, goods, equipment, farm products,
    instruments, documents, chattel paper, accounts, contract rights and general
    intangibles, such terms having the meaning ascribed by the Uniform
    Commercial Code.

             The Collateral shall include, without limitation:

                      a. all collateral securing the foregoing, and all
    guarantees and any other instruments, agreements or documents now or
    hereafter in existence relating to the foregoing (but in each case only to
    the extent representing the right to payment); and

                      b. all replacements, substitutions and renewals for or of
    the foregoing and all proceeds and products of the foregoing, including
    proceeds of insurance thereon;

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In the event that (i) in addition to this Security Agreement the Debtor is a
party to one or more other security, pledge or similar agreements providing for
a security interest in personal property in favor of the Bank (collectively the
"Other Collateral Agreements"), and (ii) the collateral described in this
Agreement and the Other Collateral Agreements is not the same, then, in such
event, this Agreement and the Other Collateral Agreements shall be read together
as one agreement such that the Obligations shall be deemed secured by the
collateral described in each of such agreements. Notwithstanding the foregoing,
Collateral shall not include any particular personal property of Debtor to the
extent that the granting of a security interest in such personal property
requires third party consent which has not been obtained; provided that Debtor
agrees to use reasonable efforts to obtain such consent at the request of the
Bank..

     4. Any and all deposits or other sums at anytime credited by or due from
the Bank to the Debtor; and any and all monies, securities and other property of
the Debtor, and the proceeds thereof now or hereafter held or received by or in
transit to the Bank from or for the Debtor, whether for safekeeping, custody,
pledge, transmission, collection or otherwise, shall at all times constitute
security for any and all Obligations.

    The Debtor hereby grants to the Bank, a lien, security interest and right of
setoff as security for all liabilities and obligations to the Bank, whether now
existing or hereafter arising, upon and against all deposits, credits,
collateral and property of the Debtor, now or hereafter in the possession,
custody, safekeeping or control of the Bank or any entity under the control of
the Bank, or in transit to any of them. At any time, Bank may set off the same
or any part thereof and apply the same to any liability or obligation of the
Debtor regardless of the adequacy of any other collateral securing the
Obligations. ANY AND ALL RIGHTS TO REQUIRE THE BANK TO EXERCISE ITS RIGHTS OR
REMEDIES WITH RESPECT TO ANY OTHER COLLATERAL WHICH SECURES THE OBLIGATIONS,
PRIOR TO EXERCISING ITS RIGHT OF SETOFF WITH RESPECT TO SUCH DEPOSITS, CREDITS
OR OTHER PROPERTY OF THE DEBTOR, ARE HEREBY KNOWINGLY, VOLUNTARILY AND
IRREVOCABLY WAIVED BY THE DEBTOR.

    5. The Debtor assumes all liability and responsibility in connection with
all Collateral acquired by Debtor; and the obligation of the Debtor to pay all
Obligations shall in no way be affected or diminished by reason of the fact that
any such Collateral may be lost, destroyed or stolen.

    6. As long as this Agreement shall remain in effect, the Debtor agrees:

                      (a) that after an Event of Default, if the Bank so demands
    in writing at any time (i) all proceeds of the Collateral shall be delivered
    to the Bank promptly upon their receipt in a form satisfactory to the Bank,
    and (ii) all chattel paper, instruments and documents pertaining to the
    Collateral shall be delivered to the Bank at the time and place and in the
    manner in which specified in the Bank's demand;

                      (b) in order to enable the Bank to comply with the law of
    any jurisdiction,

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    including state, federal and foreign, applicable to any security interest
    granted hereby or to the Collateral, to execute and deliver upon request, in
    form acceptable to the Bank, any Financing Statement, notice, statement,
    instrument, document, agreement or other paper and/or to perform any act
    requested by the Bank which may be necessary to create, perfect, preserve,
    validate or otherwise protect such security interest or to enable the Bank
    to exercise and enforce the Bank's rights hereunder or with respect to such
    security interest;

                      (c) promptly to pay any filing fees or other costs in
    connection with (i) the filing or recordation of such Financing Statements
    or any other papers described above and (ii) such searches of the public
    records as the Bank in its sole discretion shall require;

                      (d) that the Bank is authorized to file or record any such
    Financing Statements or other papers without the signature of the Debtor
    if permitted by applicable law;

                      (e) the Bank may file a photographic or other reproduction
    of this Agreement in lieu of a Financing Statement in any filing office
    where it is permissible to do so;

                      (f) except for the security interest granted hereby or
    otherwise existing on the date hereof or permitted under that certain letter
    agreement dated as of September 20, 2000 between The Princeton Review, Inc,
    and the Bank, or otherwise agreed to by the Bank in writing, the Debtor
    shall keep the Collateral and proceeds and products thereof free and clear
    of any security interest, liens or encumbrances of any kind, the Debtor
    shall promptly pay, when due, all taxes and transportation, storage and
    warehousing charges and fees affecting or arising out of the Collateral and
    shall defend the Collateral against all claims and demands of all persons at
    any time claiming the same or any interest therein adverse to the Bank;

                      (g) at all times to keep all insurable Collateral insured
    at the expense of the Debtor of the kind and in the amounts that it is
    common practice to insure such collateral against loss by fire, theft and
    any other risk to which the Collateral may be subject; and if the Bank
    requests, all policies shall be endorsed in favor of the Bank and shall be
    deposited with the Bank; and in any event, such policies will provide that
    each insurer will give the Bank not less than 30 days notice in writing
    prior to the exercise of any right of cancellation; in the event the Debtor
    fails to maintain any insurance, the Bank may (but shall not be obligated
    to) place such insurance and pay the premium therefor, in which event the
    Debtor will pay the Bank such premium with interest; the Bank may apply any
    proceeds of such insurance which may be received by it toward payment of the
    Obligations, whether or not due, in such order of application as the Bank
    may determine;

                      (h) that the Bank's duty with respect to the Collateral
    shall be solely to use reasonable care in the custody and preservation of
    collateral in its possession; the Bank shall not be obligated to take any
    steps necessary to preserve any rights in any of the Collateral against
    prior parties, and the Debtor hereby agrees to take such steps; the Debtor
    shall pay to

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    the Bank all costs and expenses, including filing and reasonable attorney's
    fees, incurred by the Bank in connection with the custody, care,
    preservation or collection of the Collateral; the Bank may, but is not
    obligated to, exercise any and all rights of conversion or exchange or
    similar rights, privileges and options relating to the Collateral; the Bank
    shall have no obligation to sell or otherwise realize upon any of the
    Collateral as herein authorized and shall not be responsible for any failure
    to do so or for any delay in so doing;

                      (i) to provide the Bank with such information as the Bank
    may from time to time request with respect to the location of the Collateral
    and any of its places of business;

                      (j) that the Bank will be notified promptly in writing of
    any change in any office as set forth below;

                      (k) that the Debtor will permit the Bank, by its officers
    and agents, to have access to and examine at all reasonable times, upon
    reasonable notice, the properties, minute books and other corporate records,
    and books of account and financial records of the Debtor;

                      (l) that the Debtor will promptly notify the Bank upon the
    occurrence of any default, as provided in this Agreement, of which the
    Debtor has knowledge.

                      (m) that the Debtor will not sell, transfer, lease or
    otherwise dispose of any of the Collateral or any interest therein, or offer
    to do so or permit anything to be done to impair the value of the Collateral
    or the security interest granted to the Bank, except in the ordinary course
    of business or with the written consent of the Bank.

                      (n) HEREBY WITH THE BANK TO MUTUALLY KNOWINGLY,
    VOLUNTARILY AND INTENTIONALLY WAIVE THE RIGHT TO A TRIAL BY JURY IN RESPECT
    OF ANY CLAIM BASED HEREON, ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS
    SECURITY AGREEMENT ANY OBLIGATION SECURED HEREBY OR ANY OTHER AGREEMENT IN
    CONNECTION HEREWITH, OR ANY OTHER DOCUMENTS CONTEMPLATED TO BE EXECUTED IN
    CONNECTION HEREWITH OR ANY COURSE OF CONDUCT, COURSE OF DEALINGS, STATEMENTS
    (WHETHER VERBAL OR WRITTEN) OR ACTIONS OF ANY PARTY. THIS WAIVER CONSTITUTES
    A MATERIAL INDUCEMENT FOR THE BANK TO MAKE LOANS FROM TIME TO TIME.

            7. (a) Upon the occurrence of an Event of Default as defined in
    Section 8 hereof, the Debtor agrees as follows: (i) the Debtor will not,
    without first obtaining the written consent of the Bank, renew or extend the
    time of payment of any Account; (ii) the Debtor will promptly notify the
    Bank in writing of any compromise, settlement or adjustment with respect to
    an Account and will forthwith account therefor to the Bank in cash for the
    amount thereof without demand or notice; (iii) the Debtor will stamp, in
    form and manner satisfactory to the Bank, its accounts receivable ledger and
    other books and records pertaining to the Accounts, with an appropriate
    reference to the security interest of the Bank in the

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    Accounts; (iv) upon request, the Debtor will furnish the Bank original or
    other papers relating to the performance of services which created any
    Account; (v) the Debtor may collect the Accounts, subject to the discretion
    and control of the Bank, but the Bank may, without cause or notice, curtail
    or terminate such authority at any time; (vi) the proceeds of the Accounts,
    when collected by the Debtor, whether consisting of cash, checks, notes,
    drafts, money orders, commercial paper of any kind whatsoever, or other
    documents, received in payment of the Accounts shall be promptly remitted by
    the Debtor to the Bank, in precisely the form received, except for
    endorsement by the Debtor when required; (vii) such proceeds until remitted
    to the Bank, as aforesaid, shall be held in trust by the Debtor for, and as
    the property of, the Bank and shall not be commingled with other funds,
    money or property; (viii) proceeds of the Accounts will be received by the
    Bank subject to final collection and receipt of proceeds in cash or by
    unconditional credit to and acceptance by the Bank; (ix) the Bank shall
    apply in its absolute discretion all collections received by it on the
    Accounts, toward the payment of any of the Obligations whether due or not
    due; (x) the Debtor will promptly notify the Bank in writing of the return
    or rejection of any merchandise represented by the Accounts and the Debtor
    shall forthwith account therefor to the Bank in cash without demand or
    notice and until such payment has been received by the Bank, the Debtor will
    receive and hold all such merchandise separate and apart, in trust for and
    subject to the security interest in favor of the Bank; and (xi) the Bank is
    authorized to sell, for the Debtor's account and sole risk, all or any part
    of such merchandise in the manner and under the terms and conditions
    hereinafter set forth.

                      (b) The Debtor represents and warrants to the Bank that
    the Debtor is the sole owner of the Accounts and no one has or claims to
    have an interest of any kind therein or thereto; each of the debtors named
    in every such Account is indebted to the Debtor in the amount and on the
    terms indicated in the invoice and schedule of Accounts; each Account is
    bona fide and arises out of the performance of labor or services or the sale
    and delivery or lease of merchandise or both; and none of the Accounts is
    now, nor will at any time in the future become, contingent upon the
    fulfillment of any contract or conditions whatsoever, nor subject to any
    defense, offset or counterclaim.

                      (c) The Debtor will maintain accurate and complete records
    of the Accounts and will make the same available to the Bank at any time
    upon two days' notice. The Bank is entitled, at any time after an Event of
    Default or after an event which with the giving of notice or lapse of time
    or both would constitute an Event of Default, to notify the account debtors
    of the Debtor to make payment upon the Accounts directly to the Bank.

     8. Upon the occurrence of an event of default under the Obligations, or a
breach of any covenants or agreements contained in any promissory note,
guarantee or agreement relating thereto (an "Event of Default"), (a) all
Obligations shall become at once due and payable, without notice, presentment,
demand for payment or protest, which are hereby expressly waived; (b) the Bank
is authorized to take possession of the Collateral and, for that purpose may
enter, with the aid and assistance of any person or persons, any premises where
the Collateral, or any part thereof is, or may be, placed and remove same; (c)
the Bank may proceed to apply to the

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Obligations, any and all deposits or other sums described in Section 4 hereof;
(d) the Bank may require the Debtor to assemble the Collateral and to make it
available to the Bank at a place designated by the Bank which is reasonably
convenient to the Bank and the Debtor; (e) the Bank shall have the right from
time to time to sell, resell, assign, transfer and deliver all or any part of
the Collateral, at any broker's board or exchange, or at public or private sale
or otherwise, at the option of the Bank, for cash or on credit for future
delivery, in such parcel or parcels and at such time or times and at such place
or places, and upon such terms and conditions as the Bank may deem proper, and
in connection therewith may grant options and may impose reasonable conditions
such as requiring any purchaser to represent that any stock constituting part of
the Collateral is being purchased for investment purposes only, all without
(except as shall be required by applicable statute and cannot be waived)
advertisement or demand upon the Debtor or right of redemption to the Debtor,
which are hereby expressly waived: unless the Collateral is perishable or
threatens to decline speedily in value or is of a type customarily sold on a
recognized market, the Bank will give the Debtor reasonable notice of the time
and place of any such public sale or of the time after which any private sale or
any other intended disposition thereof is to be made and Debtor agrees that five
(5) days prior written notice shall be deemed reasonable notice; (f) upon each
such sale, the Bank may, unless prohibited by applicable statute which cannot be
waived, purchase all or any part of the Collateral being sold, free from and
discharged of all trusts, claims, rights of redemption and equities of the
Debtor, which are hereby waived and released; (g) the Bank shall, upon mailing
notice to the Debtor that it so elects, have from the date of such mailing the
right from time to time to vote any shares of stock securing any of the
Obligations; provided, however, the Bank at any time, before or after the
occurrence of any Event of Default, may, but shall not be obligated to, transfer
into or out of its own name or that of its nominee all or any of the Collateral
which is instruments, stocks, bonds, and other securities, and the Bank or its
nominee may demand, sue for, collect, receive and hold as like Collateral any or
all interest, dividends and income thereon and if any securities are held in the
name of the Bank or its nominee, the Bank may, after the occurrence of any such
events, exercise all voting and other rights pertaining thereto as if the Bank
were the absolute owner thereof; but the Bank shall not be obligated to demand
payment of, protest, or take any steps necessary to preserve any rights in any
such Collateral against prior parties, or take any action whatsoever in regard
to any such Collateral, all of which the Debtor assumes and agrees to do.
Without limiting the generality of the foregoing, the Bank shall not be
obligated to take any action in connection with any conversion, call,
redemption, retirement or any other event relating to any of such Collateral,
unless the Debtor gives written notice to the Bank that such action shall be
taken not more than thirty (30) days prior to the time such action may first be
taken and not less than ten (10) days prior to the expiration of the time during
which such action may be taken; (h) the Bank's obligations, if any, to give
additional (or to continue) financial accommodations of any kind to the Debtor
shall immediately terminate; and (i) in addition to the rights and remedies
given to the Bank hereunder or otherwise, the Bank shall have all of the rights
and remedies of a secured party under the Uniform Commercial Code of the State
of New York.

    9. In the case of each such sale or of any proceedings to collect any of the
Obligations, the Debtor shall pay all costs and expenses of every kind for
collection, sale or delivery, including

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reasonable attorneys fees, and after deducting such costs and expenses from the
proceeds of sale or collection, the Bank may apply any residue to pay any of the
Obligations and the Debtor will continue to be liable to the Bank for any
deficiency with interest.

    10. The Bank may, but is not obligated to, (a) demand, sue for, collect or
receive any money or property at any time due, payable or receivable on account
of or in exchange for any obligations securing any of the Obligations; (b)
compromise and settle with any person liable on such obligation, and/or (c)
extend the time of payment of or otherwise change the terms thereof, as to any
party liable thereon; all without incurring responsibility to the undersigned or
affecting any of the Obligations.

    11. In order to effectuate the terms and provisions hereof, the Debtor
hereof designates and appoints the Bank and its designees or agents, after an
Event of Default, as attorney-in-fact of the Debtor, irrevocably and with power
of substitution, with authority to receive, open and dispose of all mail
addressed to the Debtor, to notify the Post Office authorities to change the
address for delivery of mail addressed to the Debtor to such address as the Bank
may designate; to endorse the name of the Debtor on any notes, acceptances,
checks, drafts, money orders, instruments or other evidence of payment or
proceeds of the Collateral that may come into the Bank's possession to sign the
name of the Debtor on any invoices, documents, drafts against and notices (which
also may direct among other things that payment be made directly to the Bank) to
Account debtors or obligors of the Debtor, assignments and requests for
verification of Accounts; to execute proofs of claim and loss; to execute any
endorsements, assignments, or other instruments of conveyance or transfer, to
adjust and compromise any claims under insurance policies; to execute releases;
and to do all other acts and things necessary and advisable in the sole
discretion of the Bank to carry out and enforce this Agreement. All acts of said
attorney or designee are hereby ratified and approved and said attorney or
designee shall not be liable for any acts of commission of omission, nor or any
error of judgment or mistake of fact or law. This power of attorney being
coupled with an interest is irrevocable while any of the Obligations shall
remain unpaid.

    12. All options, powers and rights granted to the Bank hereunder or under
any promissory note, instrument, document or other writing delivered to the Bank
shall be cumulative and shall be in addition to any other options, powers or
rights which the Bank may now or hereafter have as a secured party under the
Uniform Commercial Code of the State of New York or under any other applicable
law or otherwise.

    13. No delay on the part of the Bank in exercising any of its options,
powers, or rights, or partial or single exercise thereof, shall constitute a
waiver thereof. Neither this Agreement nor any provision hereof may be modified,
changed, waived, discharged or terminated orally, but only by an instrument in
writing, signed by the party against whom enforcement of the modification,
change, waiver, discharge or termination is sought.

    14. Notice of acceptance of this Agreement by the Bank is hereby waived.
This Agreement shall be immediately binding upon the Debtor and its successors
and assigns,

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whether or not the Bank signs this Agreement.

    15. It is the intention of the parties (a) that this Agreement shall
constitute a continuing agreement applying to any and all future, as well as
existing transactions between the Debtor and the Bank; and (b) that the security
interest provided for herein shall attach to after-acquired as well as existing
Collateral, and the Obligations covered by this Agreement shall include future
advances and other value, as well as existing advances and other value, whether
or not similar to prior or existing advances or other value, and whether or not
the advances or value are or shall be given pursuant to commitment, all to the
maximum extent permitted by the Uniform Commercial Code of the State of New
York.

    16. Unless the context otherwise requires, all terms used herein which are
defined in the Uniform Commercial Code of the State of New York shall have the
meanings therein stated.

    17. If this Agreement is signed by two or more parties as Debtors, they
shall be jointly and severally liable hereunder and the term "Debtor" wherever
used in this Agreement shall mean the parties who have signed this Agreement and
each of them.

    18. Mailing Address of Debtor. For the purpose of Section 9.402(1) of the
Uniform Commercial Code, the address of the Debtor specified below under the
caption "Chief Executive Office" (or "Major Executive Office" address whenever
the Chief Executive Office is located outside of the United States) may be
designated as the Debtor's mailing address.

    19. This Agreement shall be construed in accordance with and be governed by
the law of the State of New York.

    20. Upon the indefeasible payment in full of all Obligations, if request to
do so by the Debtor, the security interest granted hereby shall be terminated
and the Bank shall, at Debtor's request, execute and deliver to Debtor such
documents as Debtor shall reasonably request.

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             IN WITNESS WHEREOF, the Debtor has executed this Agreement or has
caused these presents to be executed and delivered by its proper corporate
officer or officers and caused its proper corporate seal to be hereto affixed,
this 27th day of October, 2000.

                           By:_______________________________________________
                           Name:    Stephen Melvin
                           Title:      Treasurer and Chief Financial Officer

STATE OF NEW YORK        )
                         ) SS.:
COUNTY OF NEW YORK       )

On the 27th day of October in the year 2000 before me, the undersigned, a Notary
Public in and for said State, personally appeared Stephen Melvin, personally
known to me or proved to me on the basis of satisfactory evidence to be the
individual whose name is subscribed to the within instrument and acknowledged to
me that he executed the same in his capacity, and that by his signature on the
instrument, the individual, or the person upon behalf of which the individual
acted, executed the instrument.

                                          _________________________________
                                                  Notary Public

                                       9<PAGE>   1

                                                                 EXHIBIT 10.15

                            CONTRIBUTION AGREEMENT

        This CONTRIBUTION AGREEMENT (this "Agreement"), dated as of September
13, 2000, is made between Convera Corporation , a Delaware corporation (the
"Company"), and NBA Media Ventures, LLC, a Delaware limited liability company
("NBAMV").

                                   RECITALS

A.      NBAMV wishes to contribute to the Company, and the Company wishes to
acquire from NBAMV, the assets set forth on Schedule 1 (the "Contributed
Assets") contemporaneously with the closing (the "Merger Closing") under the
Agreement and Plan of Contribution and Merger (the "Merger Agreement") dated
as of April 30, 2000 by and among Intel Corporation, a Delaware corporation
("Intel"), the Company, Excalibur Technologies Corporation, a Delaware
corporation that owns all of the issued and outstanding capital stock of the
Company ("Excalibur"), and Excalibur Transitory, Inc., a Delaware corporation
and a wholly-owned subsidiary of the Company ("Transitory"); and

B.      In consideration for the contribution of the Contributed Assets by
NBAMV contemporaneously with the Merger Closing, the Company shall issue to
NBAMV 4,716,940 fully paid and non-assessable shares of its Class A Common
Stock, par value $.01 per share (the "Class A Common Stock"), subject to
adjustment pursuant to this Agreement.

        In consideration of the promises set forth below,

        THE PARTIES HEREBY AGREE AS FOLLOWS:

        1.     Contribution and Issuance.

               (a)      At the Closing (as defined in Section 2), (i) NBAMV
shall contribute the Contributed Assets to the Company by executing and
delivering the Bill of Sale and Agreement substantially in the form annexed
hereto as Exhibit A, the NBA License Agreement generally in the form annexed
hereto as Exhibit B and the Sublease Agreement substantially in the form of
Exhibit G (collectively, the "Transfer Documents"), (ii) in consideration of
such contribution, the Company shall issue to NBAMV the number of shares of
its fully paid and non-assessable Class A Common Stock due under Section 1(b),
and (iii) the parties shall execute and deliver the Registration Rights
Agreement in the form attached as Exhibit E.

               (b)      Pursuant to its obligations under Section 1(b)(ii),
the Company shall issue to NBAMV 4,716,940 fully paid and non-assessable
shares of its Class A Common Stock

<PAGE>   2

("Shares"), provided that the number of Shares to be issued to NBAMV shall be
increased to the extent necessary to result in NBAMV receiving Shares
representing 10% of the aggregate number of shares of issued and outstanding
Class A Common Stock and non-voting Class B Common Stock, par value $.01 per
share ("Class B Common Stock"), after giving effect to the Merger Closing and
the issuance of shares of Class A Common Stock issuable upon conversion of the
Company's issued and outstanding preferred stock, par value $.01 per share
(the "Common Equity"). In addition, if between the date of this Agreement and
the Closing the outstanding shares of Common Equity or the Shares shall have
been changed into a different number of shares or a different class, by reason
of any stock dividend, subdivision, reclassification, recapitalization, split,
combination or exchange of shares, then the number of Shares to be issued to
NBAMV shall be correspondingly adjusted to reflect such stock dividend,
subdivision, reclassification, recapitalization, split, combination or
exchange of shares. If it shall be determined after the Closing that NBAMV did
not receive the number of Shares required pursuant to this Section 1, the
Company shall promptly issue to NBAMV a number of shares of Class A Common
Stock equal to the shortfall, or NBAMV shall promptly convey back to the
Company a number of shares of Class A Common Stock equal to the excess, in
each case for no additional consideration.

               (c)      The Company represents and warrants to NBAMV that,
when issued and delivered in accordance with the terms of this Agreement, the
Shares (i) will be duly and validly issued, fully paid and nonassessable, and
(ii) will be free of preemptive rights and restrictions on transfer other than
those imposed by Federal and state securities laws.

        2.     Closing.

               (a)      Closing; Section 351 Transaction. The closing of the
issuance of the Shares (the "Closing") shall be held immediately following the
Merger Closing at such time and place as the parties shall agree; provided,
however, that if each of the conditions to closing set forth in Section 6 have
not been satisfied or waived by the Merger Closing, the Closing shall be held
not later than two (2) business days following the satisfaction or waiver of
such conditions. The parties intend that the contribution of the Contributed
Assets by NBAMV and the issuance of the Shares by the Company shall constitute
a single integrated transaction with the contribution of assets and transfer
of shares contemplated by the Merger Agreement, which transaction shall be
governed by section 351 of the Internal Revenue Code of 1986, as amended (the
"Code"); each party to this Agreement shall report the transaction accordingly
for all tax purposes and shall not take a position, on a tax return or
otherwise, that is inconsistent with such treatment. Notwithstanding the
foregoing, each party shall be responsible for its own income tax consequences
arising from the contribution of the Contributed Assets and the receipt of the
Shares.

               (b)      Deliveries. At the Closing, the Company shall deliver
to NBAMV a certificate or certificates (as NBAMV shall reasonably request)
registered in the name of NBAMV (or in the name of a nominee of NBAMV as
indicated on the signature pages hereof), that in the aggregate represent the
Shares. The certificates representing the Shares shall bear a legend
restricting transfer under the Securities Act of 1933, as amended (the
"Securities Act"), substantially in the form annexed hereto as Exhibit C. At
the Closing, the parties also shall

<PAGE>   3

execute and deliver the Transfer Documents, the Registration Rights Agreement
and each of the certificates required under Section 6.

        3.     Representations and Warranties of the Company. The Company
hereby represents and warrants to NBAMV as of the date hereof and as of the
Closing (assuming, in the case of the representations as of Closing, the
consummation of the transactions contemplated by the Merger Agreement):

               (a)      Organization and Good Standing. The Company and each
of the Subsidiaries (as defined in Section 3(f)(i)) is duly organized, validly
existing and in good standing under the laws of the jurisdiction of its
organization and has all requisite corporate power and authority to own, lease
and operate its properties and to carry on its businesses as now conducted and
as proposed to be conducted. The Company and each of the Subsidiaries is duly
qualified or licensed and in good standing to do business in each jurisdiction
in which the failure to so qualify would not reasonably be expected to have a
material adverse effect on the business, properties, operations, prospects or
financial condition (a "Material Adverse Effect") of the Company or the
Subsidiaries. The Company has previously made available to NBAMV true and
complete copies of the certificate of incorporation and bylaws (or similar
governing documents) of the Company and each of the Subsidiaries that are
currently in full force and effect. True and complete copies of the forms of
certificate of incorporation and bylaws that will be adopted by the Company on
or prior to the Merger Closing, and that will be in full force and effect at
the Closing, are annexed hereto as Exhibit D.

               (b)      Authorization. The Company, Excalibur and Transitory
have all necessary corporate right, power and authority to enter into this
Agreement and to consummate the transactions contemplated hereby, including
the issuance, transfer and delivery of the Shares by the Company. All
corporate and, if necessary, stockholder action on the part of the Company,
Excalibur and Transitory necessary for the authorization, execution, and
delivery of this Agreement, the performance of all of its obligations under
this Agreement, and the transfer, issuance and delivery of the Shares, has
been taken. Assuming due execution and authorization by NBAMV, when this
Agreement is executed and delivered by the Company, Excalibur and Transitory
it will constitute the legal, valid and binding obligation of the Company,
Excalibur and Transitory, enforceable against the Company, Excalibur and
Transitory in accordance with its terms, subject to bankruptcy, insolvency,
reorganization and other laws of general applicability relating to or
affecting creditors' rights and to general principles of equity.

               (c)      Consents and Approvals; No Violations. Except for the
items listed on Schedule 3(c) and for any filings, permits, authorizations,
consents and approvals, the nonexistence of which would not reasonably be
expected, individually or in the aggregate, to have a Material Adverse Effect
on the Company or the Subsidiaries, no filing with or notice to, and no
permit, authorization, consent or approval of any United States (federal,
state or local) or foreign court or tribunal, or administrative, governmental
or regulatory body, agency or authority (a "Governmental Entity") is necessary
for the execution and delivery by the Company or the Subsidiaries of this
Agreement or the consummation by the Company, Excalibur or Transitory of the
transactions contemplated hereby. Neither the execution, delivery and
performance of this Agreement by the Company, Excalibur or Transitory, nor the
consummation by the Company,

<PAGE>   4

Excalibur or Transitory of the transactions contemplated hereby, will (a)
conflict with or result in any breach of any provision of the Certificate of
Incorporation or bylaws (or similar governing documents) of the Company or any
of the Subsidiaries, (b) result in a violation or breach of or constitute
(with or without due notice or lapse of time or both) a default (or give rise
to any right of termination, amendment, cancellation or acceleration) under
any of the terms, conditions or provisions of any note, bond, mortgage,
indenture, lease, license, contract, agreement or other instrument or
obligation to which the Company or any of the Subsidiaries is a party or by
which the Company or any of the Subsidiaries or any of their respective
properties or assets is bound, (c) result in any Lien (as defined below) on
the assets or shares of capital stock of the Company or any of the
Subsidiaries, or (d) violate any order, writ, injunction, decree, law,
statute, rule or regulation applicable to the Company or any of the
Subsidiaries or any of their respective properties or assets, except, with
respect to clauses (b), (c) and (d) above, for matters the existence of which
would not reasonably be expected, individually or in the aggregate, to have a
Material Adverse Effect on the Company or any of such Subsidiaries. "Lien"
means, with respect, to any asset (including any security), any mortgage,
lien, pledge, charge, security interest or encumbrance of any kind in respect
of such assets; provided, however, that the term "Lien" shall not include (i)
statutory liens for taxes that are not yet due and payable or are being
contested in good faith by appropriate procedures and are disclosed in the
Merger Agreement or are otherwise not material, (ii) statutory or common law
liens to secure obligations to landlords, lessors or renters under leases or
rental agreements confined to the premises rented, (iii) deposits or pledges
made in connection with, or to secure payment of, workers' compensation,
unemployment insurance, old age pension or other social security programs
mandated by applicable law, (iv) statutory or common law liens in favor of
carriers, warehousemen, mechanics and materialmen, to secure claims for labor,
materials or supplies and other like liens, and (v) restrictions on transfer
of securities imposed by applicable state and federal securities laws.

               (d)    No Default. Neither the Company nor any of the
Subsidiaries is in breach, default or violation (and no event has occurred
that with notice or the lapse of time or both would constitute a breach,
default or violation) of any term, condition or provision of (i) its
Certificate of Incorporation or bylaws (or similar governing documents), (ii)
any note, bond, mortgage, indenture, lease, license, contract, agreement or
other instrument or obligation to which it is a party or by which it or any of
its properties and assets is bound, or (iii) any order, writ, injunction,
decree, law, statute, rule or regulation applicable to it or any of its
properties or assets, except, with respect to clauses (ii) and (iii) above,
for matters the existence of which would not reasonably be expected,
individually or in the aggregate, to have a Material Adverse Effect on the
Company or any of the Subsidiaries.

               (e)    Capitalization.

                      (i)    As of the Closing, the authorized capital stock
of the Company shall consist of One Hundred Million (100,000,000) shares of
Class A Common Stock, Forty Million (40,000,000) shares of Class B Common
Stock, and Five Million (5,000,000) shares of preferred stock, par value $.01
per share ("Company Preferred Stock"), of which 49,587 shares are designated
as Cumulative Convertible Preferred Stock. Unless the Company shall enter into
other transactions providing for the issuance of capital stock subsequent to
the date of this

<PAGE>   5

Agreement and prior to the Closing and except for any adjustment to the total
number of Shares and shares of Class B Common Stock to be issued to Intel as
provided in Section 1.1 of the Merger Agreement at the Closing (but prior to
the issuance of the Shares), based on Excalibur's outstanding capital stock as
of the close of business on July 15, 2000 (A) the Company shall have issued
and outstanding 29,547,018 shares of Class A Common Stock, 12,633,646 shares
of Class B Common Stock and 27,180 shares of Company Preferred Stock (which in
the aggregate shall be convertible into 271,800 shares of Class A Common); (B)
Intel will have acquired 14,478,039 shares of Class A Common Stock and
12,633,646 shares of Class B Common Stock; (C) the Company will have reserved
12,633,646 shares of Class A Common Stock for issuance or delivery in
connection with the conversion of Class B Common Stock into shares of Class A
Common Stock; and (D) the Company will have reserved 2,733,628 shares of Class
A Common Stock for issuance or delivery in connection with the exercise of
Assumed Options. All of the outstanding shares of Class A Common Stock, Class
B Common Stock and Company Preferred Stock have been validly issued and are
fully paid, nonassessable and free of preemptive rights.

                      (ii)   The Company shall have reserved no more than
11,250,000 shares of Class A Common Stock for issuance upon exercise or
otherwise deliverable in connection with the exercise of outstanding Company
Stock Options. "Company Stock Option" means any option, warrant or other right
to purchase shares of Class A Common Stock, other than the Assumed Options. As
of Closing, no options, warrants or other rights to purchase shares of the
Company's capital stock will have been or will be issued other than pursuant
to Company Stock Options or Assumed Options and no Company Stock Options or
Assumed Options will have been issued to any person or entity other than a
current or former employee, director or consultant.

                      (iii)  Except as set forth in this Section 3(e), at
Closing there will be,  outstanding (i) no shares of capital stock or other
voting securities of the Company, (ii) no securities of the Company or any of
the Subsidiaries convertible into or exchangeable or exercisable for shares of
capital stock or other securities of the Company, (iii) no options, preemptive
or other rights to acquire from the Company or any of the Subsidiaries, and no
obligations of the Company or any of the Subsidiaries to issue, any capital
stock, voting securities or securities convertible into or exchangeable or
exercisable for capital stock or other voting securities of the Company, and
(iv) no equity equivalent interest in the ownership or earnings of the Company
or its Subsidiaries or other similar rights. Except for the Merger Agreement,
the Registration Rights Agreement to be executed pursuant thereto by Intel and
the Company and as set forth on Schedule 3(e), there are no contribution
agreements, subscription agreements, stockholder agreements, voting trusts or
other agreements or understandings to which the Company is a party or by which
it is bound relating to the issuance, voting, registration or repurchase of
any shares of capital stock of the Company or the making of any dividends or
distributions with respect to the capital stock of the Company.

               (f)    Subsidiaries.

                      (i)    Schedule 3(f)(i) sets forth a list of each
corporation, partnership, limited liability company, association or other
business entity in which the Company or Excalibur owns or controls, directly
or indirectly, more than 50% of the stock or other interests

<PAGE>   6

entitled to vote (each a "Subsidiary" and, together with Excalibur, the
"Subsidiaries"), the name of each other person or entity that, to the
knowledge of the Company, owns any stock or other interests entitled to vote
in such Subsidiaries (other than Excalibur) and the type and amount of stock
or other interest owned by any such other person or entity.

                      (ii)   Schedule 3(f)(ii) sets forth a true and complete
list of each equity investment in an amount of One Hundred Thousand Dollars
($100,000) or more or that represents a five percent (5%) or greater ownership
interest in the subject of such investments made by the Company or any of the
Subsidiaries in any person or entity other than the Subsidiaries ("Other
Interests"). Each of the Other Interests are owned by the Company or by one or
more of the Subsidiaries free and clear of all Liens.

               (g)    Private Offering. Subject to the truth and accuracy of
NBAMV's representations set forth in Section 4 of this Agreement, the offer,
sale and issuance of the Shares as contemplated by this Agreement will be made
in reliance on one or more exemptions from the registration requirements of
the Securities Act of 1933, as amended (the "Securities Act"), and the
qualification or registration requirements of applicable state securities or
blue sky laws.

               (h)    Brokers' Fees and Commissions. Neither the Company nor
any of its officers, directors, employees or agents has employed any
investment banker, broker, or finder in connection with the transactions
contemplated by this Agreement.

               (i)    The Merger Agreement. Each of the representations and
warranties of the Company, Excalibur, Transitory and, to the knowledge of the
Company, Intel set forth in the Merger Agreement are true and correct in all
material respects. Each of the Company, Transitory, Excalibur and, to the
knowledge of the Company, Intel has complied in all material respects with the
covenants set forth in the Merger Agreement required to be complied with by
it. As of the Closing, all of the conditions to the Merger Closing set forth
in the Merger Agreement will have been satisfied, except for any condition
disclosed to NBAMV the satisfaction of which was waived in accordance with the
Merger Agreement.

        4.     Representations and Warranties of NBAMV. NBAMV represents and
warrants to the Company as of the date hereof and as of the Closing as
follows:

               (a)    Organization and Good Standing.  NBAMV is a limited
liability company duly organized, validly existing and in good standing under
the laws of the jurisdiction of its organization.

               (b)    Authorization. NBAMV has or will have at the Closing all
necessary limited liability company right, power and authority to enter into
this Agreement and to consummate the transactions contemplated hereby. As of
the Closing, all limited liability company action on the part of NBAMV
necessary for the authorization, execution, and delivery of this Agreement and
the performance of all of its obligations under this Agreement, will have been
taken. Assuming due execution and authorization by the Company, when the
Agreement is executed and delivered by NBAMV it shall constitute a legal,
valid and binding obligation of NBAMV, enforceable against NBAMV in accordance
with its terms, subject to bankruptcy,

<PAGE>   7

insolvency, reorganization and other laws of general applicability relating to
or affecting creditors' rights and to general principles of equity.

               (c)    Consents and Approvals; No Violations. Except for the
items listed on Schedule 4(c) and for any filings, permits, authorizations,
consents and approvals the nonexistence of which would not reasonably be
expected, individually or in the aggregate, to have a Material Adverse Effect
on the Contributed Assets, no filing with or notice to, and no permit,
authorization, consent or approval of any Governmental Entity, is necessary
for the execution and delivery by NBAMV of this Agreement or the consummation
by NBAMV of the transactions contemplated hereby. Neither the execution,
delivery and performance of this Agreement by NBAMV, nor the consummation by
NBAMV of the transactions contemplated hereby, will (a) conflict with or
result in any breach of any provision of the Certificate of Formation or
limited liability company agreement (or similar governing documents) of NBAMV,
(b) result in a violation or breach of or constitute (with or without due
notice or lapse of time or both) a default (or give rise to any right of
termination, amendment, cancellation or acceleration) under any of the terms,
conditions or provisions of any note, bond, mortgage, indenture, lease,
license, contract, agreement or other instrument or obligation to which NBAMV
is a party or by which it or any of its properties and assets is bound, (c)
result in any Lien on the assets of or membership interests in NBAMV or (d)
violate any order, writ, injunction, decree, law, statute, rule or regulation
applicable to NBAMV or any of its properties or assets, except with respect to
matters the existence of which would not reasonably be expected, individually
or in the aggregate, to have a Material Adverse Effect on the Contributed
Assets.

               (d)    No Default. NBAMV is not in breach, default or violation
(and no event has occurred that with notice or the lapse of time or both would
constitute a breach, default or violation) of any term, condition or provision
of (i) its Certificate of Formation or limited liability company agreement (or
similar governing documents), (ii) any note, bond, mortgage, indenture, lease,
license, contract, agreement or other instrument or obligation to which NBAMV
is a party or by which it or any of its properties and assets is bound, or
(iii) any order, writ, injunction, decree, law, statute, rule or regulation
applicable to NBAMV or any of its properties or assets, except, with respect
to clauses (ii) and (iii) above, for matters the existence of which would not
reasonably be expected, individually or in the aggregate, to have a Material
Adverse Effect on the Contributed Assets.

               (e)    Ownership of Contributed Assets. To the knowledge of
NBAMV, NBAMV owns or possesses adequate licenses or other rights to use and
assign, free and clear of Liens, orders and arbitration awards, all of the
Contributed Assets to the extent set forth in the Transfer Documents.

               (f)    No Infringement by NBAMV. To the knowledge of NBAMV as
of the date of this Agreement, the Contributed Assets that consist of
intellectual property and the products and services consisting of the
"GameStats" software included in the Contributed Assets do not infringe upon,
violate or constitute the unauthorized use of any valid and enforceable rights
owned or controlled by any third party.

<PAGE>   8

               (g)    Brokers' Fees and Commissions. Neither NBAMV nor any of
its officers, directors, employees or agents has employed any investment
banker, broker, or finder in connection with the transactions contemplated by
this Agreement.

               (h)    Investment. NBAMV is an accredited investor as defined
in Rule 501 of Regulation D of the Securities Act and will acquire the Shares
for investment for its own account, not as a nominee or agent, and not with a
view to, or for resale in connection with, any distribution thereof.

               (i)    Experience. NBAMV has such knowledge and experience in
finance, securities, investments and other business matters so as to be able
to protect its interest in connection with the transactions contemplated by
this Agreement.

               (j)    Risk of Loss. NBAMV understands the various risks of an
investment in the Company as proposed herein and can afford to bear such
risks, including, without limitation, the risks of losing its entire
investment.

               (k)    Access to Information. NBAMV has had a reasonable
opportunity to ask questions of and receive answers from a person acting on
behalf of the Company concerning the purchase of the Shares and all such
questions have been answered to the satisfaction of NBAMV.

               (l)    No General Solicitation. NBAMV is not purchasing any of
the Shares as a result of or subsequent to any advertisement, article, notice
or other communication published in any newspaper, magazine or similar media
or broadcast over television or radio, any seminar or meeting, or any
solicitation of a subscription by a person not previously known to NBAMV in
connection with investments in securities generally.

        5.     Indemnification. (a)The Company, Excalibur and Transitory shall
jointly and severally indemnify and hold harmless NBAMV, its members and each
of their respective affiliates and the officers, directors, employees, agents,
governors and representatives of NBAMV, its members and each of their
respective affiliates ("NBAMV Covered Persons") against all loss, liability,
damage, cost or expense (including reasonable fees and expense of counsel in
any matter, including any claim between the parties to this Agreement)
("Losses") that NBAMV or any of the NBAMV Covered Persons shall suffer,
sustain or become subject to as a result of any misrepresentation or breach of
warranty, covenant or other agreement of the Company, Excalibur or Transitory
contained in this Agreement.

               (b)    NBAMV shall indemnify and hold harmless the Company and
its affiliates and the officers, directors, employees, agents, and
representatives of the Company and its affiliates ("Company Covered Persons")
against all Losses that the Company or the Company Covered Persons shall
suffer, sustain or become subject to as a result of any misrepresentation or
breach of warranty, covenant or other agreement of NBAMV contained in this
Agreement.

<PAGE>   9

        6.     Conditions to Closing.

               (a)    The respective obligations of each party to effect the
contribution of the Contributed Assets and the issuance of the Shares
(together, the "Transactions") shall be subject to the satisfaction at or
prior to the Closing of the following conditions:

                      (i)    the Merger Closing shall have occurred;

                      (ii)   no statute, rule, regulation, executive order,
decree, ruling or injunction shall have been enacted, entered, promulgated or
enforced by any United States federal or state court or United States federal
or state Governmental Entity that prohibits, restrains, enjoins or restricts
the consummation of the Transactions;

                      (iii)  the transactions contemplated by the Assignment
and Assumption Agreement  and Release, substantially in the form of Exhibit F
hereto (the "Assignment Agreement"), shall have been consummated, provided
that the Company shall not be permitted to not close under this Section
6(a)(iii) if such transactions were not consummated due to a breach by it
under the Assignment Agreement;

                      (iv)   any governmental or regulatory notices, approvals
or other requirements necessary to consummate the Transactions shall have been
given, obtained or complied with, as applicable;

                      (v)    the other party shall have executed and delivered
each of the Transfer Documents and Registration Rights Agreement; and

                      (vi)   the waiting periods (and any extension thereof)
applicable to the Transactions under the HSR Act shall have expired or been
terminated.

               (b)    The obligation of the Company to effect the Transactions
is subject to the satisfaction at or prior to the Closing of the following
conditions:

                      (i)    the representations and warranties of NBAMV
contained in this Agreement shall be true and correct (except to the extent
that the aggregate of all breaches thereof would not reasonably be expected to
have a Material Adverse Effect on the Contributed Assets) at and as of the
Closing with the same effect as if made at and as of the Closing (except to
the extent such representations specifically relate to an earlier date, in
which case such representations shall be true and correct as of such earlier
date, and in any event, subject to the foregoing Material Adverse Effect
qualification) and, at the Closing, NBAMV shall have delivered to the Company
a certificate to that effect, executed by an authorized person of NBAMV; and

                      (ii)   each of the covenants and obligations of NBAMV to
be performed at or before the Closing pursuant to the terms of this Agreement
shall have been duly performed (except to the extent the aggregate of all
breaches thereof would not reasonably be expected to have a Material Adverse
Effect on the Contributed Assets) at or before the Closing and, at the

<PAGE>   10

Closing, NBAMV shall have delivered to the Company a certificate to that
effect, executed by an authorized person of NBAMV.

               (c)    The obligations of NBAMV to effect the Transactions are
subject to the satisfaction at or prior to the Closing of the following
conditions:

               (i)    NBAMV shall have received the requisite consent of its
members to the consummation of the transactions contemplated by this
Agreement;

               (ii)   the representations and warranties of the Company
contained in this Agreement shall be true and correct (except to the extent
that the aggregate of all breaches thereof would not reasonably be expected,
individually or in the aggregate, to have a Material Adverse Effect on the
Company or the Subsidiaries) at and as of the Closing with the same effect as
if made at and as of the Closing (except to the extent such representations
specifically relate to an earlier date, in which case such representations
shall be true and correct as of such earlier date, and in any event, subject
to the foregoing Material Adverse Effect qualification) and, at the Closing,
the Company shall have delivered to NBAMV a certificate to that effect,
executed by a duly authorized executive officer of the Company;

               (iii)  each of the covenants and obligations of the Company to
be performed at or before the Closing pursuant to the terms of this Agreement
shall have been duly performed (except to the extent the aggregate of all
breaches thereof would not reasonably be expected to have a Material Adverse
Effect on the Company) at or before the Closing and, at the Closing, the
Company shall have delivered to NBAMV a certificate to that effect, executed
by a duly authorized executive officer of the Company;

               (iv)   since the date hereof, there shall have been no events,
changes or effects, individually or in the aggregate, with respect to the
Company or the Subsidiaries that would reasonably be expected, individually or
in the aggregate, to have a Material Adverse Effect on the Company or the
Subsidiaries;

               (v)    nothing shall have occurred that would result in Intel,
NBAMV and the stockholders of Excalibur (determined immediately prior to the
consummation of the transactions contemplated by the Merger Agreement), in the
aggregate, not owning "control" (as defined in Section 368(c) of the Code) of
the Company immediately following the consummation of the transactions
contemplated by the Merger Agreement and the Contribution Agreement;

               (vi)   the Company shall have delivered a certificate, executed
by a duly authorized executive officer of the Company, stating as of the
Closing (A) the number of Shares of issued and outstanding Common Equity,
which certificate shall specifically state the number of issued and
outstanding shares of Class A Common Stock and Class B Common Stock, and the
number of shares of Class A Common Stock issuable upon exercise of the Assumed
Options and upon conversation of the Preferred Stock, and (B) whether any
stock dividend, subdivision, reclassification, recapitalization, split,
combination or exchange of shares has occurred since the date hereof;

<PAGE>   11

               (vii)  NBAMV shall be reasonably satisfied that (A) all of the
conditions to the Merger Closing have been satisfied or waived and, at the
Closing, the Company shall have provided to NBAMV a certificate to that
effect, executed by a duly authorized executive officer of the Company and (B)
the waiver of any such condition has not resulted in the transactions
contemplated by the Merger Agreement being materially modified; and

               (viii) the Certificate of Incorporation and Bylaws of the
Company shall be in the form attached hereto as Exhibit D.

        7.     Compliance with the Merger Agreement. The Company, Excalibur
and Transitory shall use commercially reasonable efforts to (i) comply with
their respective obligations under the Merger Agreement, and (ii) cause
consummation of the Merger Transactions on or before December 31, 2000 in
accordance with the terms of the Merger Agreement.

        8.     Miscellaneous
 .
               (a)    Amendment.  This agreement may be amended only by a
writing signed by each party hereto.

               (b)    Assignment. This Agreement shall be binding upon and
shall inure to the benefit of the parties hereto and their respective
successors and permitted assigns. Except as otherwise provided in this
Agreement, this Agreement may not be transferred, assigned or delegated by
either party by operation of law or otherwise without the prior written
consent of the other party, provided that NBAMV may assign its rights
hereunder to any of its affiliates without the consent of the Company.

               (c)    Governing Law. This Agreement shall be governed by and
construed exclusively in accordance with the internal laws of the State of
Delaware as applied to agreements entered into and to be performed entirely
within Delaware.

               (d)    Separability. Nothing in this Agreement shall require
any act or omission contrary to an express provision of applicable statute or
regulation. If any provision of this Agreement shall be deemed invalid or
unenforceable by any court or arbitrator having jurisdiction, the court or
arbitrator shall have the discretion to modify the provision to the extent
necessary to make it valid or enforceable, and the provision (as so modified)
and the balance of this Agreement shall remain in effect and shall be enforced
to the maximum extent permitted by law.

               (e)    Waiver. No waiver of any breach or potential breach of
any party under this Agreement shall be effective unless set forth in a
writing duly signed by the party granting such waiver, and no waiver of the
breach of any matter on any one occasion shall constitute a waiver of a breach
of such matter or any other matter on any subsequent occasion. The failure of
any party to seek redress for violation of, or to insist upon the strict
performance of, any

<PAGE>   12

provision of this Agreement shall not prevent a subsequent act, which would
have originally constituted a violation, from having the effect of an original
violation.

               (f)    Headings. The headings contained in this Agreement are
inserted for convenience of reference only and shall not be a part, control or
affect the meaning hereof. All references herein to Sections are to the
Sections of this Agreement.

               (g)     Notices.  Any notice or other communication required or
permitted hereunder shall be delivered as set forth on Schedule 8(g).

               (h)    Further Assurances. Each party shall, upon the
reasonable request of another party, execute and deliver such additional
documents and instruments, and shall perform such additional acts, as may be
necessary or appropriate to carry out or clarify the terms of this Agreement.

 . (i) Expenses. Each party shall bear its own expenses (including the fees and
disbursements of its attorneys and accountants) incurred in connection with
the negotiation and preparation of this Agreement and in connection with all
obligations required to be performed by it under this Agreement, except that
the parties shall each pay 50% of the costs of any HSR filing.

 .              (j)    Entire Agreement. This Agreement (including the exhibits
and schedules hereto) contain a complete statement of the arrangements among
the parties with respect to this subject matter, and supersede all prior
agreements and understandings among them with respect to such subject matter.

 .              (k)    Cumulative Remedies The rights and remedies provided by
this Agreement are cumulative and the use of any one right or remedy by any
party shall not preclude or waive its right to use any or all other remedies.

 .              (l)    Construction. The parties have participated jointly in
the negotiation and drafting of this Agreement. In the event an ambiguity or
question of intent or interpretation arises, this Agreement shall be construed
as if drafted jointly by the parties, and no presumption or burden of proof
shall arise disfavoring any party by virtue of the authorship of any
provisions of this Agreement.

               (m)    Counterparts. This Agreement may be executed in any
number of counterparts with the same effect as if all parties hereto had
signed the same document. All counterparts shall be construed together and
shall constitute one document.

                         [SIGNATURE PAGE TO FOLLOW.]

<PAGE>   13

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

                       NBA MEDIA VENTURES LLC

                       By: /s/David J. Stern
                          --------------------------------

                       Address:

                              ----------------------------------

                              ----------------------------------

                              ----------------------------------

                              Attention:
                                        ------------------------

                       Name in which Shares shall be registered:

                       -----------------------------------------

                       CONVERA CORPORATION

                       By: /s/Patrick C. Condo
                          ----------------------------------

        For purposes of Sections 5, 7 and 8(c) of the above agreement:

                       EXCALIBUR TECHNOLOGIES CORPORATION

                       By: /s/Patrick C. Condo
                          ----------------------------------

                       EXCALIBUR TRANSITORY, INC.

                       By: /s/Patrick C. Condo
                           ---------------------------------

<PAGE>   14

<TABLE>
<CAPTION>
EXHIBITS
--------
<S>                       <C>
EXHIBIT A                    BILL OF SALE
EXHIBIT B                    NBA LICENSE AGREEMENT
EXHIBIT C                    LEGEND
EXHIBIT D                    CERTIFICATE OF INCORPORATION AND BY-LAWS
EXHIBIT E                    REGISTRATION RIGHTS AGREEMENT
EXHIBIT F                    ASSIGNMENT AND ASSUMPTION AGREEMENT AND
                               RELEASE
EXHIBIT G                    SUB-LEASE

SCHEDULES
---------

SCHEDULE 1                   CONTRIBUTED ASSETS
SCHEDULE 3(c)                COMPANY CONSENTS
SCHEDULE 3(e)                VOTING AGREEMENTS AND INTEL EQUITY
     ARRANGEMENTS
SCHEDULE 3(f)(i)             SUBSIDIARIES
SCHEDULE 3(f)(ii)            OTHER INTERESTS
SCHEDULE 4(c)                NBAMV CONSENTS
SCHEDULE 8(g)                NOTICES
</TABLE>

<PAGE>   15

                           Exhibit A - Bill of Sale

<PAGE>   16

                        Exhibit B - NBA License Agreement

<PAGE>   17

                               Exhibit C - Legend

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR UNDER ANY APPLICABLE STATE
SECURITIES LAWS AND NEITHER THE SECURITIES NOR ANY INTEREST THEREIN MAY BE
OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED OF EXCEPT PURSUANT TO
AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR SUCH APPLICABLE
STATE SECURITIES LAWS, OR AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES
ACT AND SUCH LAWS.

<PAGE>   18

               Exhibit D - Certificate of Incorporation and Bylaws

<PAGE>   19

                    Exhibit E - Registration Rights Agreement

<PAGE>   20

           Exhibit F - Assignment and Assumption Agreement and Release

<PAGE>   21

                              Exhibit G - Sub-Lease

<PAGE>   22

                         Schedule 1 - Contributed Assets

        The assets assigned and transferred under the Transfer Documents.

<PAGE>   23

                         Schedule 4(c) - NBAMV Consents

Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended.

<PAGE>   24

                             Schedule 8(g) - Notices

       Except as may be otherwise provided in the Contribution Agreement, all
notices, requests, waivers and other communications made pursuant to the
Contribution Agreement shall be in writing and shall be conclusively deemed to
have been duly given (a) when hand delivered to the other party; (b) when
received when sent by facsimile at the address and number set forth below; (c)
three business days after deposit in the U.S. mail with first class or certified
mail receipt requested postage prepaid and addressed to the other party as set
forth below; or (d) the next business day after deposit with a national
overnight delivery service, postage prepaid, addressed to the parties as set
forth below with next-business-day delivery guaranteed, provided that the
sending party receives a confirmation of delivery from the delivery service
provider.

<TABLE>
              <S>                                       <C>
              To NBAMV:                                 To the Company:

              NBA Media Ventures, LLC                   Convera Corporation
              Olympic Tower                             1921 Gallows Road, Suite 200
              645 Fifth Avenue                          Vienna, Virginia 22182
              New York, NY 10022                        Telecopier: (703) 761-1990
              Telecopier: (212) 888-8374                Attention: Chief Financial Officer
              Attention: Ed Desser

              With copies to:                           With copies to:

              Proskauer Rose LLP                        Heller, Ehrman, White & McAuliffe LLP
              1585 Broadway                             711 Fifth Avenue
              New York, NY 10022                        New York, New York 10028
              Telecopier: (212) 969-2900                Telecopier: (212) 832-3353
              Attention: Joseph M. Leccese, Esq.        Attention: Peter DiIorio, Esq.
                                                                   and
                                                        Gibson, Dunn & Crutcher LLP
                                                        333 South Grand Avenue
                                                        Los Angeles, California 90071
                                                        Telecopier: (213) 229-6360
                                                        Attention: Karen E. Bertero, Esq.
</TABLE>

       Each person making a communication hereunder by facsimile shall promptly
confirm by telephone to the person to whom such communication was addressed each
communication made by it by facsimile pursuant hereto but the absence of such
confirmation shall not affect the validity of any such communication. A party
may change or supplement the addresses given above, or designate additional
addresses, for purposes of the Contribution Agreement by giving the other party
written notice of the new address in the manner set forth above.

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