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                                                                    EXHIBIT 10.4

                             SUPPLEMENTAL INDENTURE

     THIS SUPPLEMENTAL INDENTURE is dated as of November 30, 2001, by and
between CCC Information Services Group Inc., (the "Company"), a Delaware
corporation, and Wilmington Trust Company, a Delaware banking corporation, as
trustee (the "Trustee"), and is made with reference to that certain Indenture
dated as of February 23, 2001 by and between the Company and the Trustee (the
"Indenture"). Capitalized terms used and not defined herein shall have the
meanings ascribed to such terms in the Indenture.

                                    RECITALS

          WHEREAS, the Company and the Trustee have heretofore executed and
delivered the Indenture providing for the issuance of the Notes;

          WHEREAS, the Company has heretofore issued and sold $15,463,918
aggregate principal amount of Initial Notes and additional notes constituting
PIK Notes under the Indenture;

          WHEREAS, the consent of the Holders of not less than a majority in
principal amount of the Outstanding Notes has been obtained pursuant to Section
9.2 of the Indenture with respect to entering into this Supplemental Indenture;
and

          WHEREAS, pursuant to Sections 1.2 and 9.3 of the Indenture, an
Officers' Certificate and an Opinion of Counsel, each in the form required
pursuant to said Sections 1.2 and 9.3 have been delivered to the Trustee
simultaneously with the execution and delivery hereof;

                  NOW, THEREFORE, for and in consideration of the premises and
of the mutual covenants herein contained and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties agree as follows:

                                    ARTICLE I
                            AMENDMENTS TO DEFINITIONS

     SECTION 1.1. Amendments to Definition of "Consolidated Net Income." The
definition of "Consolidated Net Income" appearing in Section 1.1 of the
Indenture is hereby amended by (i) deleting the word "and" from paragraph (5)
thereof, (ii) deleting the period at the end of paragraph (6) thereof and
replacing it with a semi-colon, and (iii) adding new paragraphs (7) and (8) to
read in full as follows:

          (7) any losses allocated to the Company's International Business
     consistent with the Company's internal accounting policies at the time is
     conducted the International Business; and

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          (8) any net income (or loss) attributable to any business which is
     accounted for by the Company as discontinued operations in accordance with
     GAAP.

     SECTION 1.2. Amendments to Definition of "EBITDA." The definition of
"EBITDA" appearing in Section 1.1 of the Indenture is hereby amended by
inserting the word "and" at the end of paragraph (3) thereof and deleting
paragraphs (5), (6) and (7) thereof.

     SECTION 1.3. Amendments to Definition of "Permitted Investments." The
definition of "Permitted Investment" appearing in Section 1.1 of the Indenture
is hereby amended by deleting paragraph 10 from such definition and renumbering
paragraphs (11), (12), (13), (14), (15) and (16) as paragraphs (10), (11), (12),
(13), (14) and (15), respectively.

     SECTION 1.4. Amendments to Definition of "Senior Credit Facility." The
definition of "Senior Credit Facility" appearing in Section 1.1 of the Indenture
is hereby amended to read in full as follows:

          "Senior Credit Facility" means the Second Amended and Restated Credit
     Facility Agreement dated as of November 30, 2001 by and among CCC
     Information Services Inc and the lenders that are parties thereto and La
     Salle Bank National Association (as administrative agent and issuing
     bank)."

     SECTION 1.5. Deletion of Certain Definitions." The definitions of
"DriveLogic Business," "Specified DriveLogic Operating Losses" and "Specified
International Operating Losses" appearing in Section 1.1 of the Indenture are
hereby deleted from the Indenture.

                                   ARTICLE II
                 ADDITIONAL AMENDMENTS SUPPLEMENTS TO INDENTURE

     SECTION 2.1. Amendment to Section 10.10. Section 10.10 is hereby amended by
(i) deleting the word "and" from paragraph (6) thereof, (ii) deleting the period
at the end of paragraph (7) thereof and inserting "; and" in lieu of the deleted
period, and (iii) adding a new paragraph (8) to read in full as follows:

          "(8) the transactions provided for and contemplated by the Purchase
     Agreement dated as of November 29, 2001 among the Company, White River
     Ventures, Inc., Capricorn Investors II, L.P. and Capricorn Investors III,
     L.P. and the exhibits and schedules thereto and the rights offering made
     pursuant to the Company's prospectus supplement dated November 30, 2001 to
     its prospectus dated July 27, 2001."

     SECTION 2.2. Amendment to Section 10.15. Section 10.15 is hereby amended by
adding a new subsection (i) to read in full as follows:

          (i) Notwithstanding paragraphs (a) through (h) of this Section 10.15,
     if a Change of Control occurs, in lieu of making a Change of Control Offer
     pursuant to this Section 10.15, the Company shall have the right to redeem
     the Notes (a "Change of Control Redemption"), in whole but not in part, in
     cash at the Redemption Price, plus any accrued and unpaid interest,
     including Additional Payments, if any, to the Redemption Date. The Company
     shall mail or cause to be mailed a notice of a Change of Control

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          Redemption within 30 business days following a Change of Control. Any
          Change of Control Redemption shall be effected pursuant to the
          provisions of Sections 11.1 through 11.7 of this Indenture.

     SECTION 2.3. Amendment to Section 11.1. Section 11.1 is hereby amended by
inserting, at the beginning of such section, the words "In addition to its right
to make a Change of Control Redemption,".

     SECTION 2.4. Amendment to Form of Note. Paragraph (6) of the Form of
Reverse of Note set forth in Exhibit A to the Indenture is hereby amended by
inserting the word "also" between the words "are" and "redeemable. Said
Paragraph (6) of the Form of Reverse of Note is hereby further amended by
inserting a new sentence at the beginning of such paragraph to read in full as
follows:

          Upon the occurrence of a Change of Control, the Company has the right
     to redeem the Notes (a "Change of Control Redemption"), in whole but not in
     part, in cash at the Redemption Price, plus any accrued and unpaid
     interest, including Additional Payments, if any, to the Redemption Date.

                                   ARTICLE III
                                  MISCELLANEOUS

     SECTION 3.1. Section 9.2 of the Indenture. This Supplemental Indenture is a
supplemental indenture pursuant to Section 9.2 of the Indenture. Upon execution
and delivery of this Supplemental Indenture, the terms and conditions of this
Supplemental Indenture shall be part of the terms and conditions of the
Indenture for any and all purposes, and all the terms and conditions of both
shall be read together as though they constitute one and the same instrument,
except that in case of conflict, the provisions of this Supplemental Indenture
will control.

     SECTION 3.2. Full Force and Effect. Except as they have been modified in
this Supplemental Indenture, each and every term and provision of the Indenture
shall continue in full force and effect, and all references to the Indenture in
the Indenture shall be deemed to mean the Indenture as supplemented and amended
pursuant hereto.

     SECTION 3.3. Counterparts. This Supplemental Indenture may be executed in
any number of counterparts and in separate counterparts, each of which when so
executed shall be deemed to be an original, but all of which counterparts shall
together constitute but one and the same instrument.

     SECTION 3.4. Governing Law. This Supplemental Indenture shall be governed
by and construed in accordance with the laws of the State of New York without
giving effect to principles of conflicts of laws.

     SECTION 3.5. Headings. The headings of the Articles and Sections of this
Supplemental Indenture have been inserted for convenience of reference only, and
are not to be considered a part hereof and shall in no way modify or restrict
any of the terms and provisions hereof.

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     IN WITNESS WHEREOF, the parties have caused this Supplemental Indenture to
be duly executed as of the day and year first above written.

                                            CCC INFORMATION SERVICES GROUP, INC.

                                            By:/s/ Reid E. Simpson
                                               ---------------------------------
                                            Name:  Reid E. Simpson
                                            Title: Executive Vice President
                                            and Chief Financial Officer

                                            WILMINGTON TRUST COMPANY, as Trustee

                                            By:/s/ Mary C. St. Amand
                                               ---------------------------------
                                            Name:  Mary C. St. Amand
                                            Title: Assistant Vice President

                                       4<PAGE>
                                                                    EXHIBIT 10.5

                       CCC INFORMATION SERVICES GROUP INC.
                           WORLD TRADE CENTER CHICAGO
                              444 MERCHANDISE MART
                             CHICAGO, ILLINOIS 60654

                                November 30, 2001

TO:      Capricorn Investors III, L.P. ("Capricorn")
         30 East Elm Street
         Greenwich, Connecticut 06830

Gentlemen:

         Reference is made to (a) the Purchase Agreement, dated as of November
29, 2001 (the "Purchase Agreement"), by and among CCC Information Services Group
Inc. (the "Company"), White River Ventures, Inc. ("White River"), Capricorn
Investors II, L.P. ("Capricorn II") and Capricorn, and the transactions
contemplated therein, relating to the purchase by White River, Capricorn II and
Capricorn of shares of the Company's common stock, par value $0.10 per share
(the "Common Stock") pursuant to the Pro Rata Exercise and the Standby
Commitment and (b) that certain Side Letter, dated February 23, 2001, between
the Company and Capricorn (the "February Side Letter") relating to, among other
things, (i) the sale by CCC Capital Trust (the "Trust") to Capricorn of 15,000
trust preferred securities of the Trust (liquidation amount of $1,000 per trust
preferred security), representing undivided beneficial interests in the assets
of the Trust (the "Trust Preferred Securities") and (ii) the sale by the Company
to Capricorn of a warrant (the "Warrant") to purchase 1,200,000 shares of Common
Stock. Terms used herein without definition shall have the meaning assigned to
such terms in the Purchase Agreement or the February Side Letter, as applicable.

         In consideration of the Rights Offering and the transactions
contemplated by the Purchase Agreement and the amendment of the Warrant in
connection therewith, Capricorn hereby agrees as follows:

         1. Notwithstanding the other provisions of the February Side Letter,
Capricorn hereby waives any rights it may have pursuant to paragraph 2 of the
February Side Letter to pay the Subscription Price per share of Common Stock
purchased pursuant to its Pro Rata Exercise and pursuant to its obligations
under the Standby Commitment through the surrender or exchange of the Securities
(as defined in the February Side Letter), and confirms that such Subscription
Price shall be paid in the manner provided in the Purchase Agreement.

         2. The Company and Capricorn hereby agree that (i) the Rights Offering
and the transactions contemplated by the Purchase Agreement shall constitute the
alternative financing as contemplated in Paragraph 2 of the February Side Letter
and (ii) the February Side Letter shall

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terminate in all respects, and any rights of Capricorn, or obligations of the
Company to Capricorn, thereunder shall be of no further force or effect, upon
the Initial Closing Date.

         3. This letter agreement shall be effective, as against any party,
after execution and delivery of a counterpart signature hereof by such party.

         4. This letter agreement shall not be assignable by the Company or
Capricorn (other than to a successor-in-interest of such party) without the
prior written consent of the other party hereto (and any purported assignment
without such consent shall be null and void), is intended to be solely for the
benefit of the parties hereto and is not intended to confer any benefits upon,
or create any rights in favor of, any person other that the parties hereto and
their permitted successors and assigns. No terms of this letter agreement may be
amended or waived except by an instrument in writing signed by the party against
whom such amendment or waiver is sought to be enforced. This letter agreement
may be executed in any number of counterparts, each of which shall be an
original, and all of which, when taken together, shall constitute one agreement.
Delivery of an executed signature page of this letter agreement by facsimile
transmission shall be as effective as delivery of a manually executed
counterpart hereof. This letter agreement shall be governed by, and construed in
accordance with, the laws of the State of Delaware, without giving effect to its
principles of conflicts of law.

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                                    Very truly yours,

                                    CCC INFORMATION SERVICES GROUP INC.

                                    By: /s/ Reid E. Simpson
                                        ----------------------------------------
                                    Name:    Reid E. Simpson
                                    Title:   Executive Vice President
                                             and Chief Financial Officer

Accepted and agreed:

CAPRICORN INVESTORS III, L.P.

By: CAPRICORN HOLDINGS III, LLC,
    its General Partner

By: /s/ Herbert S. Winokur, Jr.
        -------------------------------------
Name:   Herbert S. Winokur, Jr.
Title:  Manager

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