Document:

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                                                                    EXHIBIT 4.10

                              SECURITY AGREEMENT

     This Security Agreement is made as of March 13, 2000 between
CarsDirect.com, Inc., a California corporation ("Pledgee"), and Christine
Bucklin ("Pledgor").

                                   Recitals

     Pursuant to Pledgor's purchase of Shares under the Option Agreement dated
August 3, 1999 (the "Option"), between Pledgor and Bill Gross' idealab! ("BGIL")
under BGIL's 1999 Stock Plan, and Pledgor's purchase of 20,000 shares of BGIL
Common Stock with a promissory note on November 7, 1999, Pledgor has purchased
20,000 shares of BGIL's Common Stock (the "Shares") at a price of $12.75 per
share, for a total purchase price of $255,000. Pledgee hereby agrees to pay all
$255,000 of principal and $6,211 of interest due to BGIL as of the date hereof.
Pledgor shall execute a promissory note (the "Note") with Pledgee secured by the
Shares. The Note and the obligations thereunder are as set forth in Exhibit A to
this Security Agreement.

     NOW, THEREFORE, it is agreed as follows:

     1. Creation and Description of Security Interest. In consideration for the
        ---------------------------------------------
assumption of Pledgor's indebtedness to BGIL, Pledgor hereby pledges all of such
Shares (herein sometimes referred to as the "Collateral") represented by
certificate number CS-_____, duly endorsed in blank or with executed stock
powers, and herewith delivers said certificate to the Secretary of Pledgee
("Pledgeholder"), who shall hold said certificate subject to the terms and
conditions of this Security Agreement.

     The pledged stock (together with an executed blank stock assignment for use
in transferring all or a portion of the Shares to Pledgee if, as and when
required pursuant to this Security Agreement) shall be held by the Pledgeholder
as security for the repayment of the Note, and any extensions or renewals
thereof, to be executed by Pledgor pursuant to the terms of the Option, and the
Pledgeholder shall not encumber or dispose of such Shares except in accordance
with the provisions of this Security Agreement.

     2. Pledgor's Representations and Covenants.  To induce Pledgee to enter
        ---------------------------------------
into this Security Agreement, Pledgor represents and covenants to Pledgee, its
successors and assigns, as follows:

          (a)  Payment of Indebtedness. Pledgor will pay the principal sum of
               -----------------------
the Note secured hereby, together with interest thereon, at the time and in the
manner provided in the Note.

          (b)  Encumbrances. The Shares are free of all other encumbrances,
               ------------
defenses and liens, and Pledgor will not further encumber the Shares without the
prior written consent of Pledgee.

          (c)  Margin Regulations. In the event that Pledgee's Common Stock is
               ------------------
now or later becomes margin-listed by the Federal Reserve Board and Pledgee is
classified as a "lender" within the meaning of the regulations under Part 207 of
Title 12 of the Code of Federal Regulations ("Regulation G"), Pledgor agrees to
cooperate with Pledgee in making any amendments to the Note or providing any
additional collateral as may be necessary to comply with such regulations.

     3. Voting Rights. During the term of this pledge and so long as all
        -------------
payments of principal and interest are made as they become due under the terms
of the Note, Pledgor shall have the right to vote all of the Shares pledged
hereunder.

     4. Stock Adjustments. In the event that during the term of the pledge any
        -----------------
stock dividend, reclassification, readjustment or other changes are declared or
made in the capital structure of Pledgee, all
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new, substituted and additional shares or other securities issued by reason of
any such change shall be delivered to and held by the Pledgee under the terms of
this Security Agreement in the same manner as the Shares originally pledged
hereunder. In the event of substitution of such securities, Pledgor, Pledgee and
Pledgeholder shall cooperate and execute such documents as are reasonable so as
to provide for the substitution of such Collateral and, upon such substitution,
references to "Shares" in this Security Agreement shall include the substituted
shares of capital stock of Pledgor as a result thereof.

     5.   Options and Rights.  In the event that, during the term of this
          ------------------
pledge, subscription Options or other rights or options shall be issued in
connection with the pledged Shares, such rights, Options and options shall be
the property of Pledgor and, if exercised by Pledgor, all new stock or other
securities so acquired by Pledgor as it relates to the pledged Shares then held
by Pledgeholder shall be immediately delivered to Pledgeholder, to be held under
the terms of this Security Agreement in the same manner as the Shares pledged.

     6.   Default.  Pledgor shall be deemed to be in default of the Note and of
          -------
this Security Agreement in the event:

               (a)  Payment of principal or interest on the Note shall be
delinquent for a period of 10 days or more; or

               (b)  Pledgor fails to perform any of the covenants set forth in
the Option or contained in this Security Agreement for a period of 10 days after
written notice thereof from Pledgee.

   In the case of an event of Default, as set forth above, Pledgee shall have
the right to accelerate payment of the Note upon notice to Pledgor, and Pledgee
shall thereafter be entitled to pursue its remedies under the California
Corporations Code.

     7.   Release of Collateral. Subject to any applicable contrary rules under
          ---------------------
Regulation G, there shall be released from this pledge a portion of the pledged
Shares held by Pledgeholder hereunder upon payments of the principal of the
Note. The number of the pledged Shares which shall be released shall be that
number of full Shares which bears the same proportion to the initial number of
Shares pledged hereunder as the payment of principal bears to the initial full
principal amount of the Note.

     8.   Withdrawal or Substitution of Collateral.  Pledgor shall not sell,
          ----------------------------------------
withdraw, pledge, substitute or otherwise dispose of all or any part of the
Collateral without the prior written consent of Pledgee.

     9.   Term.  The within pledge of Shares shall continue until the payment
          ----
of  all indebtedness secured hereby, at which time the remaining pledged stock
shall be promptly delivered to Pledgor, subject to the provisions for prior
release of a portion of the Collateral as provided in paragraph 7 above.

     10.  Insolvency. Pledgor agrees that if a bankruptcy or insolvency
          ----------
proceeding is instituted by or against it, or if a receiver is appointed for the
property of Pledgor, or if Pledgor makes an assignment for the benefit of
creditors, the entire amount unpaid on the Note shall become immediately due and
payable, and Pledgee may proceed as provided in the case of default.

     11.  Pledgeholder Liability.  In the absence of willful or gross
          ----------------------
negligence, Pledgeholder shall not be liable to any party for any of his acts,
or omissions to act, as Pledgeholder.

     12.  Invalidity of Particular Provisions.  Pledgor and Pledgee agree that
          -----------------------------------
the enforceability or invalidity of any provision or provisions of this Security
Agreement shall not render any other provision or provisions herein contained
unenforceable or invalid.

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     13.  Successors or Assigns. Pledgor and Pledgee agree that all of the terms
          ---------------------
of this Security Agreement shall be binding on their respective successors and
assigns, and that the term "Pledgor" and the term "Pledgee" as used herein shall
be deemed to include, for all purposes, the respective designees, successors,
assigns, heirs, executors and administrators.

     14.  Governing Law. This Security Agreement shall be interpreted and
          -------------
governed under the internal substantive laws, but not the choice of law rules,
of California.

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     IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the day and year first above written.

"PLEDGOR"                                        /s/ Christine B. Bucklin
                                                 ----------------------------
                                                 Signature

                                                 Christine B. Bucklin
                                                 ----------------------------
                                                 Print Name

Address:                                         608 30th Street
                                                 ----------------------------
                                                 Manhattan Beach, CA 90266
                                                 ----------------------------

"PLEDGEE"                                        CARSDIRECT.COM, INC.
                                                 a Delaware corporation

                                                 /s/ Robert N. Brisco
                                                 ----------------------------
                                                 Signature

                                                 Robert N. Brisco
                                                 ----------------------------
                                                 Print Name

                                                 CEO
                                                 ----------------------------
                                                 Title

"PLEDGEHOLDER"                                   Frederick G. Silney
                                                 ----------------------------
                                                 Secretary of
                                                 CarsDirect.com, Inc.

                                      -4-
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                                   EXHIBIT A
                                   ---------

                                     NOTE

     $261,211                                                    Culver City, CA

                                                                  March 13, 2000

     FOR VALUE RECEIVED, Christine Bucklin (the "Obligor") promises to pay to
CarsDirect.com, Inc., a Delaware corporation (the "Company"), or order, the
principal sum of Two Hundred Sixty One Thousand Two Hundred Eleven Dollars
($261,211), together with interest on the unpaid principal hereof from the date
hereof at the rate of seven percent (7%) per annum, compounded semiannually.

     1.     Subject to the terms and conditions of Section 2, all principal
and/or interest are due on March 13, 2005. Payment of principal and interest
shall be made in lawful money of the United States of America.

     2.     Twelve (12) months after the date Obligor ceases to be a service
provider (i.e. an employee, director or consultant) for the Company, payment for
all outstanding principal under this Note shall be due and payable.

     3.     Except as set forth above, the Obligor may not prepay the principal
or interest on this Note without the prior written consent of the Company.

     4.     This Note is secured in part by a pledge of 20,000 shares of Bill
Gross' idealab! Common Stock under the terms of a Security Agreement of even
date herewith and is subject to all the provisions thereof.

     5.     The holder of this Note shall have full recourse against the
undersigned, and shall not be required to proceed against the collateral
securing this Note in the event of default.

    6.      Should any action be instituted for the collection of this Note, the
reasonable costs and attorneys' fees therein of the holder shall be paid by the
undersigned.

                                                        /s/ Christine B. Bucklin
                                                        ------------------------
                                                            Christine Bucklin

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                                   EXHIBIT B
                                   ---------

                     ASSIGNMENT SEPARATE FROM CERTIFICATE

     FOR VALUE RECEIVED I, Christine Bucklin, hereby sell, assign and transfer
unto CarsDirect.com, Inc. (20,000) shares of the Common Stock of Bill Gross'
idealab! standing in my name of the books of said corporation represented by
Certificate No. C- ____ herewith and do hereby irrevocably constitute and
appoint ________________________ to transfer the said stock on the books of the
within named corporation with full power of substitution in the premises.

     This Stock Assignment may be used only in accordance with the Security
Agreement between CarsDirect.com, Inc. and the undersigned dated March 13, 2000.

Dated:                                   Signature: /s/ Christine B. Bucklin
                                                    ----------------------------

INSTRUCTIONS: Please do not fill in any blanks other than the signature line.
The purpose of this assignment is to enable the Company to exercise its
"repurchase option," as set forth in the Agreement, without requiring additional
signatures on the part of the Purchaser.

                                      -2-<PAGE>

Confidential treatment has been requested for portions of this exhibit. The copy
filed herewith omits the information subject to the confidentiality request.
Omissions are designated as [***]. A complete version of this exhibit has been
filed separately with the Securities and Exchange Commission.

                                                                   EXHIBIT 10.11

                                  TERM SHEET
                            Dated December 16, 1999
                            -----------------------

Vision
------

 .    CarsDirect.com ("CarsDirect") and Finance One Corporation ("Bank One"), a
     wholly-owned subsidiary of BANK ONE CORPORATION, share the view that there
     exists an opportunity to create a best-in-class provider of financial
     products to buyers of vehicles via CarsDirect.com and the internet;

 .    that such a provider would rely on a small consortium of like-minded
     providers, each of which would bring best-in-class capabilities in their
     respective product offerings;

 .    that such a consortium would require conformity to certain principles aimed
     at assuring a highly satisfactory customer experience including: an
     attractive and competitive price, straightforward features (no surprises or
     small print "gotcha's") and the best on-line, real time decision and
     servicing possible;

 .    that products to be provided by the consortium would include super-prime
     loans and leases through super-sub-prime loans, home equity loans, used car
     financing, credit cards and relevant insurance products;

 .    that more than one provider at each level is necessary to avoid impairing
     CarsDirect's competitiveness from time to time;

 .    that agreed-upon independent reference points will be used to gauge the
     competitiveness of each provider's pricing, and that price competitiveness
     shall not be deemed to mean a need to match manufacturers' captives'
     subvention programs or special promotional offers in the marketplace; and

 .    that CarsDirect and Bank One and/or the consortium will collaborate in
     joint releases and other publicity efforts to enhance the stature of both
     parties in automotive eCommerce.

1.    CarsDirect specifically requires:

      a.    CarsDirect will determine who will be the members of the consortium
            in addition to Bank One and Bank One's own correspondent network. In
            addition, CarsDirect has the right to present Bank One with a list
            of lenders it would regard as unacceptable participants as Bank One
            correspondents because of evidence that they would not deliver the
            customer experience as envisioned above, and to propose ending the
            participation of any Bank One correspondent who fails to meet
            agreed-upon service standards. Bank One is obliged to give these
            proposals due consideration.

                                      -1-
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        b.    Integration support in the following areas during the nine-month
              period of exclusivity described elsewhere in this document:

              (1)  Systems (integration for Bank One to the consortium system)

              (2)  Operations (fulfillment of current plans, e.g., auto
                     decisioning, custom finance)

              (3)  MIS (Bank One will continue to provide current monthly
                     reporting)

              (4)  Training (limited to the product level to ensure CarsDirect
                     is an effective distributor)

              (5)  Legal (ability to offer products that overcome legal and
                     regulatory constraints in certain states, e.g., balloon
                     loan, zero-dollar drive off product)

              (6)  Problem Solving

        c.    ***

        d.    A system architecture that allows multiple interfaces between
              CarsDirect and its consortium of participating lenders, one of
              which is Bank One.

        e.    In keeping with the above requirement, Bank One will design its
              origination systems and processes in a manner that facilitates its
              participation in a multi-lender consortium and will help
              CarsDirect design standard formats and interconnectivity protocols
              that equally facilitate the participation of Bank One and other
              lenders in an efficient, on-line loan and lease origination
              process linked to the vehicle purchase transaction.

        f.    The ability to approve credit for virtually all creditworthy
              customers.

2.      Bank One specifically requires:

        a.    In exchange for helping CarsDirect develop and implement the
              business processes required to function as an effective financial
              intermediary, and for training its people, Bank One requires a
              period of nine months from the start of this agreement in which
              Bank One and its correspondents will be the sole providers of

                                      -2-
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        loans and leases to CarsDirect customers. This is designed to ensure the
        necessary mutual focus on and commitment of both parties to rapid
        implementation of a full line of products, protect CarsDirect and Bank
        One from unduly complicating development with the introduction of
        multiple origination processes, and eliminate the threat of compromising
        Bank One's competitive advantage due to financial service competitors
        having access to its intellectual capital during the early development
        phase.

b.      Agreement by CarsDirect that by acting as a sales and distribution
        intermediary for Bank One-branded loans and leases, CarsDirect will not
        acquire any ownership of such Bank One-branded loans and leases.

c.      An understanding as between Bank One and CarsDirect with respect to the
        ownership of intellectual property rights in the systems and processes
        developed by each of them as follows: (i) with respect to those systems
        and processes that are developed by Bank One and/or its vendors, Bank
        One and/or its vendors shall have ownership; (ii) with respect to those
        systems and processes that are developed by CarsDirect and/or its
        vendors, CarsDirect and/or its vendors shall have ownership; and (iii)
        with respect to those systems and processes that are developed by both
        Bank One and/or its vendors and CarsDirect and/or its vendors, both Bank
        One and/or its vendors and CarsDirect and/or its vendors shall have
        ownership. It is understood that each of Bank One and CarsDirect will be
        concurrently building its own correspondent network and building
        technological infrastructure to support its network (and it is therefore
        understood that each network may have features and functionality that is
        similar to the other); the purpose of delineating ownership rights as
        set forth above is to protect each of Bank One's and CarsDirect's
        investments in their respective technological infrastructure, and not to
        interfere with each's ability to build and operate their respective
        networks.

d.      If Bank One and CarsDirect decide to co-develop any financial products
        or processes, the ownership of such products and processes, and any
        provisions governing their marketing and delivery, will be established
        under separate agreements.

e.      Terms governing the co-branding of any Bank One products provided by
        Bank One to CarsDirect customers will likewise be covered under separate
        agreements.

f.      CarsDirect shall fully implement and make available to its customers any
        loans and leases that it has asked Bank One to provide within a
        reasonable period of time after its completed development by Bank One
        and availability to CarsDirect, and suitable training and operational
        requirements are met, unless a mutual delay is agreed upon. This
        requires that CarsDirect make readily available for product training,
        and for the implementation of related processes and interconnectivity,
        all of the sales, customer service and operations personnel who will be
        involved in the marketing and delivery of the product.

                                      -3-
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        g.      Bank One will provide loans and leases to CarsDirect customers
                only in those states and localities where CarsDirect has full
                legal and regulatory clearance to operate, whether as a seller
                or broker of vehicles, lessor or sublessor, or intermediary in
                the sale and distribution of the loans and leases to be offered.
                In the event that CarsDirect (i) obtains licenses in states in
                which Bank One has not currently agreed to provide loans and
                leases because of CarsDirect licensing considerations, (ii)
                obtains a favorable regulatory or other ruling, (iii) modifies
                its programs in such a manner that licensing is no longer
                required or (iv) develops a legal theory which would reasonably
                support CarsDirect engaging in its current business model
                without obtaining such required licenses, Bank One will be
                afforded the opportunity to review such developments at that
                time and shall be permitted to add such additional state(s) to
                those states in which Bank One offers exclusive financing for
                CarsDirect at Bank One's option. Bank One will use its
                reasonable best efforts to notify CarsDirect of its decision
                whether to provide such loans or leases within 15 business days
                after receipt of notice from CarsDirect of any such development
                and CarsDirect shall have the right to obtain such loans or
                leases from providers other than Bank One or its consortium in
                the circumstances described in clauses (i) through (iv) above if
                and to the extent Bank One or the consortium has not agreed to
                provide such loans or leases in the circumstances described in
                clauses (i) through (iv) above.

        h.      Bank One and CarsDirect will agree upon and establish
                performance standards - encompassing processes and results --
                for financial service sales, customer service activity and
                interactions with Bank One dealers. CarsDirect will implement
                monitoring and timely reporting mechanisms for the agreed-upon
                performance metrics. The standards, remedial measures and
                consequences of failure to meet the standards will be covered in
                separate service agreements.

3.      There will be an initial nine-month period of exclusivity during which
Bank One will:

        a.      provide all loan and lease products subject to Sections 2(g),
                3(d) and 3(f), with the exception that CarsDirect may (i) during
                the exclusivity period, refer transactions to manufacturers'
                captive finance companies or their related dealers for the
                express and exclusive purpose of accessing subvention programs
                being offered at the same time through their dealers to finance
                the sale or lease of specified vehicles and (ii) seek other
                providers of loan or lease products for any loans or leases that
                have been conclusively "turned-down" by Bank One and its
                correspondents.

        b.      directly or through its correspondents provide coverage of
                consumer risk tiers, product requirements and vehicles at to-be
                agreed-upon percentages or levels. These categories of coverage,
                coverage levels and a timetable for scaling up and achieving
                them - along with exceptions necessitated by competitor
                subvention and promotional programs -- will be defined in a
                separate agreement.

                                      -4-
<PAGE>

        c.      continue to offer the current rate agreement through January 31,
                2000, after which time Bank One will ***.

        d.      continue to offer *** as provided in Section 1(c) and
                immediately commence with CarsDirect upon execution of this Term
                Sheet a study designed to identify a lease product or products
                best suited for CarsDirect by January 31, 2000. Any conclusions
                of such study will be implemented as soon as practical after
                they are reached, and Bank One agrees that if Bank One and
                CarsDirect conclude that Bank One cannot provide lease products
                for all automotive makes and models offered by CarsDirect
                reasonably acceptable to CarsDirect, Bank One will waive its
                rights under Section 3(a) hereof to exclusivity with respect to
                such lease product for each make and model for which Bank One
                cannot provide a reasonably acceptable lease product.

        e.      provide resources and support to operationalize all products
                within CarsDirect as necessary to support effective sale,
                origination and customer service by CarsDirect personnel and to
                achieve efficient electronic connectivity with the processing
                infrastructure of Bank One and its correspondents.

        f.      offer *** as defined in Section 1(c) and ensure competitiveness
                by keeping Bank One pricing in line with market pricing as
                determined by independent measurements and sources and a
                mechanism for resolving noncompetitiveness to be defined in a
                separate agreement.

        g.      in order to provide further assurance of competitive pricing at
                all levels during the nine-month period of exclusivity, Bank One
                will ***.

4.      Following the exclusivity period, *** CarsDirect will have no obligation
to consume any such loans and leases, except as contracted for under separate
agreements.

5.      The concept of Right of First Refusal will not exist, but in
consideration for Bank One's role in facilitating the creation of multi-lender
capabilities, until the later of (i) three years from the date of this term
sheet or (ii) the termination of this term sheet by either CarsDirect or Bank
One pursuant to Section 8, where CarsDirect offers to its customers a loan,
lease or insurance product, and on any given loan, lease or insurance
transaction Bank One and its correspondents have a loan, lease or insurance
product for such transaction with terms that are at least equal to the most
favorable terms otherwise available to CarsDirect for such transaction, then in
such circumstances CarsDirect will fulfill such transaction needs with the
product provided by Bank One and its consortium. Notwithstanding the foregoing
sentence, if CarsDirect acquires a business that is subject to a pre-existing
contractual obligation with respect to loans, leases or insurance that is
inconsistent with this Section, CarsDirect shall not be subject to the
requirement of the first sentence of this Section until the initial scheduled
expiration date of such existing

                                      -5-
<PAGE>

contractual obligation, it being understood, however, that CarsDirect shall act
in good faith to carry out the intent of this Section.

6.      After the exclusivity period, CarsDirect will be free to refer any
financial transactions to other lenders of its choosing, with the exception of
members of Bank One's correspondent network. It is understood, however, that
Bank One will not collaborate in the implementation of and training for
competitors' products and will seek to protect its intellectual property and
trade secrets from competitors. While Bank One will have developed origination
processes for CarsDirect and will have trained CarsDirect's originators in a way
that will significantly advance CarDirect's ability to form another lending
consortium, the business relationship with lenders other than Bank One and its
correspondents will be solely between CarsDirect and those other lenders, and
will not involve Bank One unless specific contractual agreements are reached
with Bank One that would enable such involvement.

7.      The parties will work urgently to devise a way to offer end-of-term
lease vehicles through CarsDirect, provided that such efforts do not conflict
with Bank One's obligations to other persons with whom it has contracted to
provide such vehicles and/or co-develop used car sales businesses, and provided
that we agree upon a basis for fairly compensating Bank One for all of the
intellectual capital it has developed in the asset remarketing business which
would be made available to CarsDirect in the course of developing this
capability.

8.      Neither CarsDirect nor Bank One may terminate this Term Sheet prior to
September 15, 2000.  On or after September 15, 2000, either CarsDirect or Bank
One may terminate this Term Sheet provided that (i) the terminating party has
given 30 days prior written notice of such termination to the other party and
(ii) Sections 1(c) and 5 of this Term Sheet shall survive any such termination
for the duration of the periods specified in said sections.

                                      -6-

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