Document:

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                                                                    EXHIBIT 10.4

                               PARENTS AGREEMENT
                               -----------------

     This PARENTS AGREEMENT (the "Agreement") is entered into as of the twenty-
                                  ---------
third day of February, 2001, by and between LIBERTY DIGITAL, INC., a Delaware
corporation ("LDI") and SONY PICTURES ENTERTAINMENT INC., a Delaware corporation
              ---
("SPE").
  ---

     WHEREAS, pursuant to that certain Membership Interest Purchase Agreement,
dated as of February 23, 2001 (the "Purchase Agreement"), by and among LDI, LDIG
                                    ------------------
Gamenet, Inc., a Delaware corporation ("LDI Sub"), Liberty Media Corporation, a
                                        -------
Delaware corporation ("LMC"), SPE, Sony Pictures Cable Ventures I Inc., a
                       ---
Delaware corporation ("SPCV") and TGSC Management, Inc., a California
                       ----
corporation ("TGSC"), LDI and its affiliates are acquiring an aggregate of fifty
              ----
percent (50%) of the membership interests in Game Show Network, LLC, a Delaware
limited liability company ("GSN"), from SPCV and TGSC, each an indirect wholly-
                            ---
owned subsidiary of SPE, upon the terms and conditions set forth therein;

     WHEREAS, in connection with the transactions contemplated by the Purchase
Agreement, SPE, SPCV, TGSC, LDI and LDI Sub have entered into that certain
Amended and Restated Operating Agreement of GSN dated as of February 23, 2001
(the "Operating Agreement") pursuant to which LDI Sub would become a member of
      -------------------
GSN;

     WHEREAS, in connection with the Purchase Agreement and the Operating
Agreement and the transactions (the "Transactions") contemplated thereby, the
                                     ------------
parties thereto and certain of their affiliates are entering into certain
agreements in connection with the consummation of the Transactions; and

     WHEREAS, to assure the performance of each of the parties other than LDI,
LMC and SPE under each of the Related Agreements (as defined in the Purchase
Agreement), LDI has agreed to make certain undertakings to SPE, and SPE has
agreed to make certain undertakings to LDI.

     NOW, THEREFORE, in consideration of the mutual promises and agreements of
the parties, and other good and valuable consideration the receipt of which is
hereby acknowledged, SPE and LDI do hereby agree as follows:

     SECTION 1.  Definitions.
                 -----------

     Unless otherwise defined herein, terms defined in the Operating Agreement
are used herein as therein defined.

     SECTION 2.  Covenants.
                 ---------

          (a)    SPE covenants and agrees with and for the benefit of LDI, LDI
Sub and any Permitted Transferee thereof (except, as to any Permitted
Transferee, to the extent, as to any Related Agreement, that the provisions of
such Related Agreement by their terms limit

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the extent to which a Permitted Transferee may benefit thereunder) that for so
long as SPCV, TGSC or any Controlled Affiliate of SPE is a party to, obligated
under or bound by the terms of any Related Agreement, SPE shall cause each of
SPCV, TGSC and any Controlled Affiliate of SPE who is a party thereto, obligated
thereunder or bound thereby to comply with the terms of and perform all of its
covenants and obligations (such covenants and obligations of SPCV, TGSC and such
Controlled Affiliates of SPE are referred to collectively herein as the "SPE-
                                                                         ---
Related Obligations") arising under such Related Agreement. In the event that
-------------------
SPCV, TGSC or such Controlled Affiliate of SPE fails to timely perform any SPE-
Related Obligation, SPE shall perform any such SPE-Related Obligation as fully
as if said agreements were set forth in full herein with each reference therein
to SPCV, TGSC or any Controlled Affiliate of SPE deemed a reference to SPE.
Nothing herein shall be deemed to be a waiver by SPE of its right to assert any
defense to the enforcement of SPE's obligations under this Agreement which SPCV,
TGSC or any Controlled Affiliate of SPE may assert pursuant to any of the
Related Agreements. The obligations of SPE hereunder shall not be affected by
(i) any Transfer of the Membership Interests beneficially owned by SPE to any
Controlled Affiliate of SPE or any third party or (ii) any Transfer of any
equity interest of a Controlled Affiliate of SPE.

          (b)  LDI covenants and agrees with and for the benefit of SPE, SPCV,
TGSC and any Permitted Transferee thereof (except, as to any Permitted
Transferee, to the extent, as to any Related Agreement, that the provisions of
such Related Agreement by their terms limit the extent to which a Permitted
Transferee may benefit thereunder) that for so long as LDI Sub or any Controlled
Affiliate of LDI is a party to, obligated under or bound by the terms of any
Related Agreement, LDI shall cause each of LDI Sub and any Controlled Affiliate
of LDI who is a party thereto, obligated thereunder or bound thereby to comply
with the terms of and perform all of its covenants and obligations (such
covenants and obligations of LDI Sub and such Controlled Affiliates of LDI are
referred to collectively herein as the "LDI-Related Obligations") arising under
                                        -----------------------
such Related Agreement; provided, however, that notwithstanding anything to the
                        --------  -------
contrary set forth in this Agreement or any Related Agreement, neither LDI nor
any of its Controlled Affiliates other than LDI Sub, shall have any obligation
or liability under or with respect to, the obligations of LMC under the Purchase
Agreement or of LDI Sub and LMC under the Note (as defined in the Purchase
Agreement) (including, but not limited to, (x) any obligation relating to the
payment of interest, in cash or securities, on the Note or (y) any obligation
arising with respect to any security interest granted to, or similar arrangement
made with, LMC (or any Controlled Affiliate thereof other than LDI) by LDI
Sub)). In the event that LDI Sub or such Controlled Affiliate of LDI fails to
timely perform any LDI-Related Obligation, LDI shall perform any such LDI-
Related Obligation as if said agreements were set forth in full herein with each
reference therein to LDI Sub or such Controlled Affiliate of LDI deemed a
reference to LDI. Nothing herein shall be deemed to be a waiver by LDI of its
right to assert any defense to the enforcement of this Agreement which LDI Sub
or any Controlled Affiliate of LDI may assert pursuant to any of the Related
Agreements. The obligations of LDI hereunder shall not be affected by (i) any
Transfer of the Membership Interests beneficially owned by LDI to any Controlled
Affiliate of LDI or any third party or (ii) any Transfer of any equity interest
of a Controlled Affiliate of LDI.

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          (c)  Each of LDI and SPE (each a "Contracting Party"; the term
"Related Obligations" shall mean, with respect to SPE, the SPE-Related
Obligations as defined in Section 2(a) above, and shall mean, with respect to
LDI, the LDI-Related Obligations as defined in Section 2(b) above) acknowledges
and agrees that its covenants and agreements set forth in this Agreement are its
primary obligations, and that the parties benefited by such covenants and
agreements (SPE, SPCV and TGSC and any Permitted Transferee (except, as to any
Permitted Transferee, to the extent, as to any Related Agreement, that the
provisions of such Related Agreement by their terms limit the extent to which a
Permitted Transferee may benefit thereunder) being referred to herein as
"Benefited Parties" with respect to LDI-Related Obligations; and LDI and LDI Sub
and any Permitted Transferee (except, as to any Permitted Transferee, to the
extent, as to any Related Agreement, that the provisions of such Related
Agreement by their terms limit the extent to which a Permitted Transferee may
benefit thereunder) being referred to herein as "Benefited Parties" with respect
to SPE-Related Obligations) are entering into the Purchase Agreement in reliance
upon such covenants and agreements and upon their enforceability as primary
obligations. For the purpose of more completely effectuating the intent of the
parties that the covenants and agreements of each of LDI and SPE set forth in
this Agreement be fully enforceable in accordance with their terms for the
benefit of the respective Benefited Parties, each of LDI and SPE as a
Contracting Party further agrees as follows:

               (i)   Such Contracting Party hereby waives (A) notice of
acceptance of this Agreement and of any action by any Benefited Party in
reliance thereon, (B) presentment, demand of payment, notice of dishonor or
nonpayment, protest and notice of protest with respect to any Related
Obligations, and giving any notice of default or other notice to, or making any
demand on anyone (including without limitation such Contracting Party and any
Controlled Affiliate of such Contracting Party, including any obligor on any
Related Obligations) liable in any manner for the payment or performance of any
Related Obligations, and (C) any right to require any Benefited Party to proceed
initially against any obligor (other than such Contracting Party) on any Related
Obligations or marshal any assets upon any default in the payment or performance
of any such Related Obligations, provided that nothing contained in this
subsection (i) shall be deemed to be a waiver of any notice expressly required
to be given pursuant to any Related Agreement to any obligor on any Related
Obligations.

               (ii)  Any Benefited Party may at any time and from time to time
without the consent of or notice to such Contracting Party and without
increasing, impairing or releasing the obligations of such Contracting Party
hereunder (x) exercise or refrain from exercising any right or remedy against
any obligor on any Related Obligations, including such Contracting Party, and
(y) modify, amend, extend, supplement or waive or consent to the breach of any
provision of any Related Agreement, to which modifications, amendments,
extensions, supplements, waivers and consents such Contracting Party hereby
assents. Without limiting the foregoing, it is specifically understood that any
modification, limitation or discharge of the liability of any obligor on any of
the Related Obligations arising out of or by virtue of any bankruptcy,
arrangement, reorganization or similar proceeding for relief of debtors under
federal or state law hereinafter initiated by or against any such obligor will
not

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affect, modify, or discharge the liability of such Contracting Party in any
manner and this Agreement shall remain in full force and effect and shall be
enforceable against such Contracting Party to the same extent and with the same
effect as if such proceedings had not been instituted.

               (iii)  The covenants and agreements set forth in Section 2(a)
hereof (as to SPE) and Section 2(b) hereof (as to LDI) are absolute and
unconditional, primary, direct and immediate and, except as provided below,
shall be valid and binding upon such Contracting Party regardless of (x) any
invalidity, irregularity, defect or unenforceability of or in any Related
Agreement or any other obligation or agreement of any obligor on any of the
Related Obligations or of such Contracting Party, (y) any action or inaction by
any Benefited Party or (z) any other circumstance which might otherwise
constitute a defense available to, or a discharge or release of, any obligor on
any of the Related Obligations or such Contracting Party by operation of law
except for payment, satisfaction or defeasance of the Related Obligations.

               (iv)   No failure or delay on the part of any Benefited Party in
exercising any right, power or privilege hereunder shall operate as a waiver
thereof, nor shall any single or partial exercise of any right, power or
privilege hereunder preclude any other or further exercise thereof or the
exercise of any other right, power or privilege. The rights and remedies of any
Benefited Party hereunder are cumulative and concurrent and not exclusive of any
other rights or remedies any Benefited Party may have.

               (v)    Such Contracting Party hereby waives and releases all
relief from any and all appraisement, stay or execution law of any state now in
force or hereafter enacted.

               (vi)   No set-off, permissive counterclaim, reduction or
diminution of an obligation, or any defense of any kind or nature that such
Contracting Party has or may have against any obligor on any Related Obligation
or any Benefited Party, except payment, satisfaction or defeasance of the
Related Obligations, shall affect, modify or impair such Contracting Party's
obligations hereunder. Any claim that such Contracting Party now or hereafter
has against any obligor on any of the Related Obligations by way of subrogation
under this Agreement or otherwise shall be fully subordinate in lien and payment
to any claim that any Benefited Party now or hereafter has against any obligor
on any of the Related Obligations.

               (vii)  Such Contracting Party hereby waives any claim, remedy or
other right it may now or hereafter acquire against any obligor on any of the
Related Obligations that arises from the existence or performance of the Related
Obligations, including without limitation, any right of subrogation,
reimbursement, exoneration, contribution, or indemnification against any such
obligor, whether or not such claim, remedy or right arises in equity, under
contract, statute, or common law.

               (viii) Without limiting the generality of the foregoing, for the
purpose of more completely effectuating the intent of the parties that the
covenants and agreements of such Contracting Party set forth in this Agreement
be fully enforceable in accordance with

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their terms for the benefit of the respective Benefited Parties in the event
that (notwithstanding the provisions of Section 9 hereof, which the parties
intend be fully effective in every respect) any provision of this Agreement is
for any reason and/or to any extent held to be subject to or governed by
California law, such Contracting Party hereby expressly waives (A) pursuant to
California Civil Code Section 2856(a)(1), all of such Contracting Party's rights
of subrogation, reimbursement, indemnification and contribution and any other
rights and defenses that are or may become available to such Contracting Party
by reason of California Civil Code Sections 2787 to 2855, inclusive, and (B)
pursuant to California Civil Code Section 2856(a)(2), all rights or defenses
such Contracting Party may have in respect of its obligations hereunder with
respect to the Related Obligations by reason of any election of remedies by any
Benefited Party, even if that election of remedies has destroyed such
Contracting Party's rights of subrogation and reimbursement against any
Benefited Party.

     SECTION 3. Representations and Warranties.
                ------------------------------

     Each of SPE and LDI represents and warrants to the other party hereto as
follows:

     Such entity is duly organized, validly existing and in good standing under
the laws of the jurisdiction of its organization and has the full corporate
power and authority to own and operate its business and properties and to enter
into and perform the terms of this Agreement.  The execution and delivery of
this Agreement by such entity and the compliance by it with and fulfillment of
its obligations hereunder have been duly authorized by all necessary action on
the part of such entity.

     SECTION 4. Waiver; Remedies.
                ----------------

     The observance of any term of this Agreement may be waived (either
generally or in a particular instance and either retroactively or prospectively)
by the Person entitled to enforce such term, but any such waiver shall be
effective only if in a writing signed by the Person against which such waiver is
to be asserted.  Except as otherwise provided herein, no failure or delay of any
Person in exercising any power or right under this Agreement shall operate as a
waiver thereof, nor shall any single or partial exercise of any such right or
power, or any abandonment or discontinuance of steps to enforce such right or
power, preclude any other or further exercise thereof or the exercise of any
other right or power.

     SECTION 5. Assignment.
                ----------

     This Agreement may not be assigned by either party hereto without the prior
written consent of the other party.  This Agreement shall be binding upon and
inure to the benefit of the parties hereto and their respective successors and
permitted assigns.  Nothing in this Agreement, whether express or implied, shall
be construed to give any Person other than the parties hereto and their
respective successors and permitted assigns any legal or equitable right, remedy
or claim under or in respect of this Agreement.

     SECTION 6. Amendment.
                ---------

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     This Agreement may not be amended, modified or supplemented except by an
instrument in writing signed on behalf of each of the parties.

     SECTION 7.  Headings.
                 --------

     The headings contained in this Agreement are for reference purposes only
and shall not affect the meaning or interpretation of this Agreement.

     SECTION 8.  Severability.
                 ------------

     If any provision of this Agreement or the application thereof to any Person
or circumstance is held by a court of competent jurisdiction to be invalid, void
or unenforceable, the remaining provisions hereof, or the application of such
provision to Persons or circumstances other than those as to which it has been
held invalid, void or unenforceable, shall remain in full force and effect and
shall in no way be affected, impaired or invalidated thereby; provided, that if
                                                              --------
any provision hereof or the application thereof shall be so held to be invalid,
void or unenforceable by a court of competent jurisdiction, then such court may
substitute therefor a suitable and equitable provision in order to carry out, so
far as may be valid and enforceable, the intent and purpose of the invalid, void
or unenforceable provision and, if such court shall fail or decline to do so,
the parties shall negotiate in good faith in an effort to agree upon such a
suitable and equitable provision.  To the extent that any provision shall be
judicially unenforceable in any one or more states, such provision shall not be
effective with respect to any other state, each provision with respect to each
state being construed as several and independent.

     SECTION 9.  Governing Law.
                 -------------

     This Agreement shall be governed by, and construed in accordance with, the
laws of the State of Delaware, excluding (to the fullest extent a Delaware court
would permit) any rule of law that would cause application of the laws of any
jurisdiction other than the State of Delaware.

     SECTION 10. Jurisdiction.
                 ------------

     For the purpose of any suit, action or proceeding arising out of or
relating to this Agreement, each of LDI and SPE hereby irrevocably consents and
submits to the exclusive jurisdiction and venue of any of the courts of the
State of Delaware, and irrevocably agrees to service of process by certified
mail, return receipt requested, postage prepaid, to its address set forth in
Section 12 hereof. Each of LDI and SPE irrevocably waives any objection which it
may now or hereafter have to the laying of the venue of any such suit, action or
proceeding brought in such court and any claim that such suit, action or
proceeding brought in such a court has been brought in an inconvenient forum and
agrees that service of process in accordance with the foregoing sentence shall
be deemed in every respect effective and valid personal service of process upon
it. The provisions of this Section 10 shall not limit or otherwise affect the
right of any Benefited Party to institute and conduct an action in accordance
with the terms of the Related Agreement applicable to such action, or

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(notwithstanding the first sentence of this Section 10) to institute and conduct
any action in any jurisdiction to enforce any judgment of any of the courts of
the State of Delaware in any suit, action or proceeding arising out of or
relating to this Agreement. Each Benefited Party and each of LDI and SPE hereby
waives all right to a trial by jury in any litigation relating to this
Agreement.

     SECTION 11. Relationship and Apparent Authority.
                 -----------------------------------

     This Agreement shall not be deemed or construed to constitute or
create the relationship of principal and agent, joint venturers, partners or any
other similar relationship between or among the parties hereto, the existence of
which is hereby expressly denied by the parties.  No party shall have any
authority, apparent or otherwise, to act on behalf of any other, and the
respective rights and obligations of the parties with respect to the subject
matter of this Agreement shall be solely those set forth herein.

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     SECTION 12. Notices.
                 --------

     All notices, requests, demands, waivers and other communications required
or permitted to be given under this Agreement shall be in writing and shall be
deemed to have been duly given if delivered personally or mailed, certified or
registered mail with postage prepaid, or sent by facsimile (which is confirmed)
or sent by reputable courier (providing proof of delivery) to the parties at the
following addresses:

     (i)  If to LDI:

               Liberty Digital, Inc.
               1100 Glendon Avenue
               Suite 2000
               Los Angeles, CA 90024
               Attention: Craig Enenstein
               Facsimile: (310) 209-3606

               with a copy to:

               Baker Botts L.L.P.
               599 Lexington Ave.
               New York, New York 10022-6030
               Attention: Frederick H. McGrath, Esq.
               Facsimile: (212) 705-5125

     (ii)  If to SPE:

               Sony Pictures Entertainment Inc.
               Culver Studios, Building C
               Suite 211
               Culver City, CA 90232-3195
               Attention: Len Grossi
               Facsimile: (310) 202-3404

               with a copy to:

               Sony Pictures Entertainment Inc.
               10202 West Washington Blvd.
               Culver City, CA 90232
               Attention: General Counsel
               Facsimile: (310) 244-1797

or to such other Person or address as any party shall specify by notice in
writing to the other party.  All such notices, requests, demands, waivers and
communications shall be deemed to have been received on the date of delivery or
on the third business day after the mailing

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thereof, except that any notice of a change of address shall be effective only
upon actual receipt thereof.

     SECTION 13.  Entire Agreement.
                  ----------------

     The provisions of this Agreement set forth the entire agreement and
understanding between the parties as to the subject matter hereof and supersede
all prior agreements, oral or written, and other communications between the
parties relating to the subject matter hereof.

     SECTION 14.  Termination.
                  -----------

     This Agreement shall terminate and be of no further force or effect
upon the payment and performance in full of all of the SPE-Related Obligations
and LDI-Related Obligations, as applicable; provided, that this Agreement shall
                                            --------
continue to be effective or be reinstated (as the case may be) if at any time
payment or performance of any of the SPE-Related Obligations or LDI-Related
Obligations is refunded or must otherwise be returned by any Benefited Party
upon any bankruptcy, arrangement, reorganization or similar proceeding for
relief of debtors under state or federal law, all as though such payment or
performance had not been made.

     SECTION 15.  Counterparts.
                  ------------

                This Agreement may be executed in one or more counterparts, all
of which shall constitute one and the same instrument.

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     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed and delivered as of the date first above written.

                                  LIBERTY DIGITAL, INC.

                                  By: /s/ Craig Enenstein
                                      -------------------
                                      Craig Enenstein
                                      Senior Vice President

                                  SONY PICTURES ENTERTAINMENT INC.

                                  By: /s/ Sean Carey
                                      ------------------
                                      Sean Carey
                                      Senior Vice President,
                                      Corporate Development

                                       10<PAGE>

                                                                    Exhibit 10.5

                                PROMISSORY NOTE
                                ---------------

$100,000,000
                                                             Englewood, Colorado
                                                               February 23, 2001

          FOR VALUE RECEIVED, the receipt and sufficiency of which each of the
undersigned, Liberty Media Corporation ("LMC") and LDIG Gamenet, Inc.
("Gamenet," and together with LMC, "Makers"), hereby acknowledges, Makers hereby
jointly and severally promise to pay to the order of Sony Pictures Cable
Ventures I Inc. and TGSC Management, Inc. (together, "Payees"), at Culver
Studios, Building C, Suite 211, Culver City, California 90232-3195, or at such
other place as Payees may from time to time designate by written notice to
Makers, in lawful money of the United States of America, the sum of ONE HUNDRED
MILLION DOLLARS (US $100,000,000) plus interest from the date of this Note on
the unpaid balance. All principal and interest is to be paid without setoff or
counterclaim as set forth below. Makers further agree as follows:

     Section 1.  Interest.
                 --------

               (a)  Except as provided in Section 1(c), this Note will bear
interest at a per annum rate of 5.81875% from the date hereof until this Note is
paid in full. Gamenet, as primary obligor with respect to interest from the date
hereof to the Due Date (as defined below), shall pay the interest from the date
hereof to February 22, 2002 (the "Due Date") by delivery of 692,835 shares of
the Series A Common Stock of Liberty Digital, Inc.; provided that, to the extent
Gamenet fails to pay such interest within five business days of the date hereof,
Makers shall pay interest in cash in the amount of $5,818,750 within one
business day of such failure.

               (b)  Interest shall be computed on the basis of a year of 365
days for the actual number of days elapsed.

               (c)  After the Due Date, all unpaid principal and accrued
interest shall bear interest until it is paid at two percent (2%) in excess of
the interest rate otherwise applicable to the unpaid balance under this Note and
will be paid at the time of any payment of principal.

               (d)  All agreements between Makers and Payees are expressly
limited so that in no contingency or event whatsoever shall the interest paid or
agreed to be paid to Payees for the use, forbearance, or detention of the
indebtedness evidenced by this Note exceed the maximum rate permissible under
applicable law (the "Maximum Rate"). If under any circumstance Payees should
ever receive an amount which would represent interest in excess of the Maximum
Rate, such amount as would be excessive interest shall be applied to the
reduction of the principal amount owing under this Note and not to the payment
of interest.

                                      -1-
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     Section 2.  Payments.
                 --------

               (a)  All outstanding amounts owing under this Note, including
unpaid interest and principal, shall be due and payable on the Due Date.

               (b)  Makers shall have no right to prepay this Note, and the
interest paid pursuant to Section 1(a) shall be non-refundable.

               (c)  If at any time any payment or performance of this Note is
refunded or must otherwise be returned by Payees or either of them upon any
bankruptcy, arrangement, reorganization or similar proceeding for relief of
debtors under state or federal law, Makers shall thereupon jointly and severally
owe such payment or performance hereunder, all as though such payment or
performance had not been made.

     Section 3.  Default. Upon the occurrence of any of the following events
                 -------
(each an "Event of Default") then Payees may declare all amounts owed pursuant
to this Note to be due and payable forthwith, whereupon the same shall
immediately become due and payable:

               (a)  LMC commences any proceeding under any bankruptcy,
reorganization, arrangement, readjustment of debt, moratorium or similar law or
statute;

               (b)  a proceeding shall be commenced against LMC under any
bankruptcy, reorganization, arrangement, readjustment of debt, moratorium or
similar law or statute, and relief is ordered against it, or the proceeding is
controverted but is not dismissed within sixty (60) days after commencement
thereof; or

               (c)  LMC consents to or suffers the appointment of a receiver,
trustee, or custodian to any substantial part of its assets that is not vacated
within thirty (30) days.

     Section 4.  Waivers.
                 -------

               (a)  Each of Makers hereby waives (i) notice of acceptance of
this Agreement and of any action by any Payee in reliance thereon, (ii)
presentment, demand of payment, notice of dishonor or nonpayment, protest,
notice of protest and all other notices or demands of any kind or nature with
respect to this Note, and giving any notice of default or other notice to, or
making any demand on anyone (including without limitation either of Makers)
liable in any manner for the payment of this Note, and (C) any right to require
Payees or either of them to proceed initially against the other Maker of this
Note or marshal any assets upon any default in the payment of this Note.

               (b)  Either Payee may at any time and from time to time without
the consent of or notice to either Maker and without increasing, impairing or
releasing the obligations of such Maker hereunder exercise or refrain from
exercising any right or remedy against any obligor on this

                                      -2-
<PAGE>

Note, including such Maker. Without limiting the foregoing, it is specifically
understood that any modification, limitation or discharge of the liability of
either Maker hereunder arising out of or by virtue of any bankruptcy,
arrangement, reorganization or similar proceeding for relief of debtors under
federal or state law hereinafter initiated by or against such Maker will not
affect, modify, or discharge the liability of the other Maker hereunder in any
manner and this Note shall remain in full force and effect and shall be
enforceable against such other Maker to the same extent and with the same effect
as if such proceedings had not been instituted.

          (c)  The liability of each of Makers hereunder is absolute and
unconditional, primary, direct and immediate and, except as provided below,
shall be valid and binding upon such Maker regardless of (x) any invalidity,
irregularity, defect or unenforceability of or in this Note or any other
obligation or agreement of either Maker, (y) any action or inaction by either
Payee or (z) any other circumstance which might otherwise constitute a defense
available to, or a discharge or release of, any obligor on this Note by
operation of law except for payment in full of all principal and interest under
this Note.

          (d)  No failure or delay on the part of Payees or either of them in
exercising any right, power or privilege hereunder shall operate as a waiver
thereof, nor shall any single or partial exercise of any right, power or
privilege hereunder preclude any other or further exercise thereof or the
exercise of any other right, power or privilege. The rights and remedies of
Payees hereunder are cumulative and concurrent and not exclusive of any other
rights or remedies either Payee may have.

          (e)  Each Maker hereby waives and releases all relief from any and all
appraisement, stay or execution law of any state now in force or hereafter
enacted.

          (f)  No set-off, permissive counterclaim, reduction or diminution of
an obligation, or any defense of any kind or nature that either Maker has or may
have against the other Maker or either Payee, except payment in full of all
principal and interest under this Note, shall affect, modify or impair such
Maker's obligations hereunder. Any claim that such Maker now or hereafter has
against the other Maker by way of subrogation under this Agreement or otherwise
shall be fully subordinate in lien and payment to any claim that either Payee
now or hereafter has against such other Maker.

          (g)  Until this Note is indefeasibly paid in full, each Maker hereby
waives any claim, remedy or other right it may now or hereafter acquire
hereunder against the other Maker that arises from the existence or payment of
this Note, including without limitation, any right of subrogation,
reimbursement, exoneration, contribution, or indemnification against such other
Maker, whether or not such claim, remedy or right arises in equity, under
contract, statute, or common law.

          (h)  Each of Makers hereby agrees that a waiver of rights under this
Note shall not be deemed to be made by Payees unless such waiver shall be in
writing, duly signed by Payees, and that each such waiver, if any, shall apply
only with respect to the specific instance involved and shall

                                      -3-
<PAGE>

in no way impair the rights of Payees or the obligations of either of Makers in
any other respect at any other time.

          (i)  Each of Makers agrees that in the event Payees demand or accept
partial payment of this Note, such demand or acceptance shall not be deemed to
constitute a waiver of any right to demand the entire unpaid balance of this
Note at any time in accordance with the terms of this Note.

          (j)  Without limiting the generality of the foregoing, for the purpose
of more completely effectuating the enforceability of this Note in accordance
with its terms in the event that (notwithstanding the provisions of Section 7(b)
hereof, which Makers intend be fully effective in every respect) any provision
of this Note is for any reason and/or to any extent held to be subject to or
governed by California law, each Maker hereby expressly waives (A) pursuant to
California Civil Code Section 2856(a)(1), all of such Maker's rights of
subrogation, reimbursement, indemnification and contribution and any other
rights and defenses that are or may become available to such Maker by reason of
California Civil Code Sections 2787 to 2855, inclusive, and (B) pursuant to
California Civil Code Section 2856(a)(2), all rights or defenses such Maker may
have in respect of its obligations hereunder by reason of any election of
remedies by Payees or either of Payees, even if that election of remedies has
destroyed such Maker's rights of subrogation and reimbursement against the other
Maker.

     Section 5. Collection Costs. Makers will upon demand pay to Payees the
                ----------------
amount of any and all reasonable costs and expenses including, without
limitation, the reasonable fees and disbursements of its counsel (whether or not
suit is instituted) and of any experts and agents, which Payees may incur in
connection with the enforcement of this Note.

     Section 6. Assignment of Note. Makers will not be permitted to assign
                ------------------
or transfer this Note or any of its obligations under this Note in any manner
whatsoever except with the prior written consent of Payees.

     Section 7. Miscellaneous.
                -------------

          (a)  This Note may be modified only by prior written agreement signed
by the party against whom enforcement of any waiver, change, or discharge is
sought.

          (b)  This Note shall be governed by, and construed in accordance with,
the laws of the State of Delaware, without giving effect to such state's
principles of conflict of laws.

          (c)  Subject to Section 6, the covenants, terms, and conditions
contained in this Note apply to and bind the successors and assigns of the
parties.

          (d)  This Note constitutes a final written expression of all the terms
of the agreement between the parties regarding the subject matter hereof, is a
complete and exclusive

                                      -4-
<PAGE>

statement of those terms, and supersedes all prior and contemporaneous
agreements, understandings, and representations between the parties. If any
provision or any word, term, clause, or other part of any provision of this Note
shall be invalid for any reason, the same shall be ineffective, but the
remainder of this Note shall not be affected and shall remain in full force and
effect.

          (e)  All notices, consents, or other communications provided
for in this Note or otherwise required by law shall be in writing (including a
written communication sent by telecopier) and may be given to or made upon the
respective parties at the following mailing addresses:

          Payees:   c/o Sony Pictures Entertainment Inc.
                    Culver Studios, Building C
                    Suite 211
                    Culver City, California 90232-3195
                    Attention: Len Grossi
                    Fax:  310/202-3404

          Makers:   c/o Liberty Media Corporation
                    9197 South Peoria Street
                    Englewood, Colorado 80112
                    Attention: General Counsel
                    Fax:  720/875-5382

Such addresses may be changed by notice given as provided in this subsection.
Notices shall be effective upon the date of receipt; provided, however, that a
notice (other than a notice of a changed address) sent by certified or
registered U.S. mail, with postage prepaid, shall be presumed received no later
than three (3) business days following the date of sending.

          (f)  Time is of the essence under this Note.

                                      -5-
<PAGE>

     IN WITNESS WHEREOF, Makers have executed this Note effective as of the date
first set forth above.

                                        LIBERTY MEDIA CORPORATION

                                        By:   ----------------------------------
                                        Name: ----------------------------------
                                        Its:  ----------------------------------

                                        LDIG GAMENET, INC.

                                        By:   ----------------------------------
                                        Name: ----------------------------------
                                        Its:  ----------------------------------

                                      -6-

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