Document:

<PAGE>

                                                                   Exhibit 10.31

                              SETTLEMENT AGREEMENT

         This Settlement Agreement ("Agreement") is entered into this 7th day of
May, 2002 ("Effective Date"), by and between Jupiter Media Metrix, Inc. ("JMM"),
a Delaware corporation, and NetRatings, Inc. ("NetRatings"), a Delaware
corporation. These entities are referred to individually as "Party" and
collectively as the "Parties."

                                    RECITALS

         A.  On March 27, 2001, JMM filed a Complaint for Patent Infringement in
Federal District Court in the District of Delaware, Jupiter Media Metrix, Inc.
v. NetRatings, Inc., et al., Civil Action No. 01-193-SLR (the "Action");

         B.  On May 1, 2001, NetRatings filed an Answer and Counterclaims in the
Action;

         C.  Each of the Parties later filed amended pleadings in the Action;

         D.  The Parties have independently determined that it is in each of
their respective best interests to compromise any and all claims they have or
may have with respect to the Action and settle the Action on the terms and
conditions set forth below.

                                    AGREEMENT

         NOW, THEREFORE, in consideration of the above recitals and mutual
promises and covenants herein contained, the Parties agree as follows:

<PAGE>

                                    ARTICLE 1

                      DISMISSAL WITH PREJUDICE AND RELEASE
                      ------------------------------------

         1.1 Dismissal. Concurrently with the execution of this Agreement, the
             ---------
Parties shall execute the stipulation and proposed order in the form attached as
Exhibit A, pursuant to which the Parties agree to dismiss the Action with
prejudice, including all claims and counterclaims. Immediately following the
execution of this Agreement, the Parties shall file with the United States
District Court for the District of Delaware (the "Court") the fully executed
version of Exhibit A. Each Party intends and agrees that the Court shall
nevertheless retain jurisdiction for the purpose of resolving any controversy or
claim arising out of or relating to the terms and conditions of this Agreement,
a Party's performance or failure to perform hereunder, or any other claim or
dispute arising out of or resulting from the Agreement. Exhibit A shall be filed
under seal, together with the Proposed Sealing Order attached as Exhibit B, for
use as appropriate in connection with the Court's express reservation of
jurisdiction. Each Party further agrees to waive any objection they may have now
or hereafter to the venue of any proceeding filed in the Court for the purpose
referenced in this Section 1.1.

         1.2 Attorney's Fees and Costs Incurred In Action. Except as expressly
             --------------------------------------------
provided in this Agreement, each Party shall bear its own fees, costs and
expenses incurred in the Action.

         1.3 General Mutual Releases. Except for limitations expressly stated in
             -----------------------

this Agreement, and in consideration of the mutual promises and covenants set
forth herein, including the payments and other consideration described in
Article 2 below, JMM and NetRatings, on behalf of their

                                       2

<PAGE>

respective officers, directors, agents, employees, representatives, assigns,
heirs, and attorneys, hereby forever release and absolutely discharge (i) the
other Party, (ii) each Party's respective officers, directors, employees,
stockholders, agents, representatives, servants, and independent contractors,
(iii) each Party's respective distributors, resellers, independent sales
representatives, licensees, customers, and end users of any and all versions of
its products or services, including without limitation the Insight software, the
tracking software and any data or databases resulting from the use thereof, (iv)
each Party's insurers, (v) successors and assigns of all such persons or
entities and of the interests of such persons or entities in the intellectual
property involved in any of the Subject Agreements as that term is defined in
Section 1.4, and (vi) each Party's attorneys, and the partners, associates,
employees, agents, insurers, assigns, investigators and investigative agencies
of or for their attorneys, from any and all causes of action, actions, theories,
affirmative defenses, judgments, liens, indebtedness, damages, losses, claims,
liabilities and demands of every kind and character, including without
limitation infringement of U.S. Patent No. 6,115,680 (the "'680 Patent") at any
time, arising from the dispute underlying the Action, or which was or could have
been raised in the Action, or arising from any conduct by the Parties or their
agents, attorneys or representative in defending, prosecuting and resolving the
Action, whether known or unknown, suspected or unsuspected, existing or
prospective, up to and as of the Effective Date.

         1.4 Limitations on Scope of Release. The releases set forth in Section
             -------------------------------
1.3 above shall not apply to any cause of action, action, judgment, lien,
indebtedness, damage, loss, claim, liability or demand of any kind and character
arising from and after the Effective Date out of or resulting from

                                       3

<PAGE>

(i) a breach of any specific warranty or representation undertaken by any Party
as set forth expressly in this Agreement or the Intellectual Property Agreement
attached as Exhibit C (collectively, the "Subject Agreements"), (ii) the breach
by any Party of any provision of any of the Subject Agreements, or (iii) any
actions taken, or failure to act, occurring from or after the Effective Date
which is not licensed or otherwise expressly permitted in any of the Subject
Agreements and which gives rise to any such cause of action.

         1.5 Waiver. In furtherance of the above stated intention to bar each
             ------
and every claim, demand, and cause of action falling within the scope of the
release set forth in this Article 1, each Party hereby expressly waives any and
all rights or benefits conferred by the provisions of Section 1542 of the
California Civil Code, and by any similar provision of California, other state
or federal law now in effect or in effect in the future, and expressly consent
that this Agreement shall be given full force and effect according to each and
all of its express terms and conditions, including those relating to unknown and
unsuspected claims, demands and causes of action specified above, if any.
Section 1542 provides:

         "A general release does not extend to claims which the creditor does
not know or suspect to exist in his favor at the time of executing a release,
which if known by him must have materially affected his settlement with the
debtor."

         1.6 Informed Release. The Parties herein acknowledge that they
             ----------------
understand the significance and potential consequences of their release of
unknown claims and of the specific

                                       4

<PAGE>

waiver of their rights under Section 1542. The Parties intend that the claims
released by them under this Agreement be construed as broadly as possible.

         1.7 No Admission. The Parties acknowledge that this Agreement effects
             ------------
the settlement of claims which are denied and contested and agree that the
settlement reflected by this Agreement shall not be construed as an admission
against the interests of any Party.

                                    ARTICLE 2

                                  CONSIDERATION
                                  -------------

         2.1 Form of Consideration. In consideration of the promises and mutual
             ---------------------
covenants contained in the Subject Agreements, NetRatings agrees to pay JMM the
lump sum of fifteen million dollars ($15,000,000). The Parties acknowledge that
such payment and the execution of the various documents contemplated by the
Subject Agreements constitutes full consideration.

         2.2 Payment By NetRatings. The payment referenced in Section 2.1 shall
             ---------------------
be sent on the Effective Date via wire transfer to Chase Manhattan Bank, 1 Penn
Plaza, New York, New York, for deposit to the account of Jupiter Media Metrix,
Account No. 323195695, ABA No. 021000021.

                                   ARTICLE 3

                         REPRESENTATIONS AND WARRANTIES
                         ------------------------------

         3.1 General Representations and Warranties. Each Party (the
             --------------------------------------
"representing party") represents and warrants to the other Party that: (i) the
person signing the Subject Agreements and the stipulation and proposed order
attached as Exhibit A (collectively the "Subject Documents") is a duly
authorized representative of the representing party on whose behalf he or she is
signing; (ii) the

                                       5

<PAGE>

Subject Documents are legally binding agreements fully enforceable against the
representing party in accordance with their terms; (iii) the execution and
delivery of the Subject Documents and the consummation of the transactions
provided thereunder do not require any third-party consent or assignment from a
third party, and will not violate, conflict with, or result in the breach of any
obligation, mortgage, lien, lease agreement, instrument, law, order, arbitration
award, judgment or decree to which the representing party is subject or bound;
and (iv) the representing party is the sole and lawful owner of all rights,
title and interest in and to every claim in matters which it releases in Article
1 and that the representing party has not heretofore assigned or transferred to
any person or entity any right, title or interest in the matters it is
releasing.

                                    ARTICLE 4

                         CONFIDENTIALITY AND DISCLOSURE
                         ------------------------------

         4.1 Following execution of the Subject Documents, the Parties shall
jointly issue the press release in the form attached as Exhibit D.

         4.2 Each Party is permitted to disclose the terms of the Subject
Agreements, information relating to the Subject Agreements, or information
related to the `680 Patent (collectively "Information") if advised by counsel
they are required to do so by law (including applicable federal and state
securities laws and regulations promulgated thereunder), legal process or court
order. In the event either Party receives either a subpoena (or other legal
process) or court order seeking Information, such Party shall, before responding
thereto, provide counsel for the other Party with written notice of such legal
process, order or legal requirement in sufficient time (if reasonably

                                       6

<PAGE>

feasible) to permit the other Party the opportunity to object, seek to limit
such production of information and/or obtain an appropriate protective order.

         4.3 Except as provided in Sections 4.1 and 4.2, neither Party may
disclose any information regarding the Action, or the terms of the Subject
Agreements, publicly or privately, other than to provide the information
contained in the press release attached as Exhibit D in response to a legitimate
business inquiry. Except as otherwise expressly prohibited by or inconsistent
with the Intellectual Property Agreement attached as Exhibit C, nothing in this
Agreement is intended to prevent either Party from discussing the `680 Patent or
the license thereof to JMM for any bona fide business purpose provided such
Party does not divulge proprietary or confidential information of the other
Party.

                                    ARTICLE 5

                                  MISCELLANEOUS
                                  -------------

         5.1 The Subject Documents (together with their respective attachments
referenced therein) constitute and contain the final, complete and exclusive
agreements and understandings between the Parties regarding the subject matter
addressed therein. As such, the Subject Documents supersede and replace all
prior negotiations and all agreements, proposed or otherwise, whether written or
oral, concerning the subject matter thereof. No supplement, modification, or
amendment to any of the Subject Documents shall be binding unless executed in
writing and signed by the Parties expressly stating that modification is
intended.

                                       7

<PAGE>

         5.2 This Agreement shall be governed by the substantive laws of the
State of Delaware, and all rights and obligations of the Parties to this
Agreement, and the interpretation, construction and enforceability hereof shall
also be governed by the laws of the State of Delaware

         5.3 All terms of the Subject Documents shall be binding upon, inure to
the benefit of, and be enforceable by the Parties hereto and their respective
legal representatives, successors and assigns. Except as expressly provided in
the Subject Documents, the Subject Documents are not intended to confer on any
person or entity other than the Parties any right or remedy thereunder.

         5.4 If any term or other provision of the Subject Agreements is
invalid, illegal or incapable of being enforced by any rule of law or public
policy, all other conditions and provisions of the Subject Agreements shall
nevertheless remain in full force and effect. Upon such determination that any
term or other provision is invalid, illegal or incapable of being enforced, the
Parties hereto shall negotiate in good faith to modify the Subject Agreements so
as to effect the original intent of the Parties as closely as possible to the
fullest extent permitted by applicable law in an acceptable manner to the end
that the transactions contemplated hereby are fulfilled to the extent possible.

         5.5 Each of the Parties acknowledges that it has been represented by
independent counsel of its choice throughout all negotiations which preceded the
execution of the Subject Documents, and that the Subject Documents have been
executed after consultation with such independent legal counsel. Additionally,
no provision of the Subject Documents shall be interpreted for or against any
Party because that Party or its attorneys drafted the provision.

                                       8

<PAGE>

         5.6 All notices required to be given under this Agreement shall be in
writing and delivered to the Parties at their respective addresses set forth
below (or such other address as specified by either Party in accordance with the
provisions of this Section) by (i) hand delivery, (ii) nationally recognized
overnight courier, (iii) mailed postage prepaid by certified or registered mail,
return receipt requested, or (iv) facsimile transmission with verification of
receipt, and will be deemed to be effective the day of delivery by hand or
overnight courier, the day of transmission if sent by facsimile, or three (3)
days after mailing if sent by mail:

If to NetRatings:             NetRatings, Inc.
                              890 Hillview Court
                              Milpitas, CA 95035
                              Attention:  General Counsel
                              Facsimile No.: 408-586-0208

With a Copy to:               Gray Cary Ware & Freidenrich LLP
                              401 B Street, Suite 2000
                              San Diego, CA 92101
                              Attention:  John Allcock, Esq.
                              Facsimile No.:  610-699-2701

If to JMM:                    Jupiter Media Metrix, Inc.
                              21 Astor Place, 6th Floor
                              New York, NY 10003
                              Attention:  Chief Executive Officer
                              Facsimile No.:  917-534-6800
                              Attention:  General Counsel

With a Copy to:               Brobeck, Phleger & Harrison LLP
                              Two Embarcadero Place
                              2200 Geng Road
                              Palo Alto, CA 94303
                              Attention:  Daniel Harris, Esq.
                              Facsimile No.:  650-331-8109

                                       9

<PAGE>

         IN WITNESS WHEREOF, the Parties hereto have caused this Agreement to be
duly executed on the date below written.

JUPITER MEDIA METRIX, INC.                        NETRATINGS, INC.

By:  /s/  Robert Becker                 By:  /s/  William Pulver
     ------------------                      -------------------

Title:   Chief Executive Officer             Title:   Chief Executive Officer
         Jupiter Media Metrix, Inc.                   NetRatings, Inc.

Date:    May 7, 2002                          Date:   May 7, 2002

                                       10

<PAGE>

                                    EXHIBIT A

                          UNITED STATES DISTRICT COURT

                          FOR THE DISTRICT OF DELAWARE

----------------------------------------
                                         )
JUPITER MEDIA METRIX, INC.               )   Civil Action No. 01-193- SLR
                                         )
                           Plaintiff,    )
v.                                       )
                                         )
NETRATINGS, INC. and                     )
NETVALUE USA, INC.,                      )
                                         )
                           Defendants.   )
                                         )
----------------------------------------

     STIPULATION AND [PROPOSED] ORDER OF DISMISSAL OF ACTION WITH PREJUDICE

     IT IS HEREBY STIPULATED by and between the remaining parties to this action
that the above-captioned action be and hereby is dismissed in its entirety with
prejudice pursuant to Rule 41(a)(1)(ii) of the Federal Rules of Civil Procedure.
The parties also expressly consent to the reservation of jurisdiction over this
action by this Court, for the purpose of enforcing the terms of the Settlement
Agreement effective as of May 7, 2002, a copy of which has been filed under seal
with

<PAGE>

this Court, pursuant to which Jupiter Media Metrix, Inc. and NetRatings, Inc.
have agreed to dismiss this action in its entirety with prejudice. Each party
will bear its own costs.

Dated: May __, 2002              Jupiter Media Metrix, Inc.

                                 By
                                   ---------------------------------------------

                                   ---------------------------------------------
                                   Its
                                      ------------------------------------------

Dated: May __, 2002              NetRatings, Inc.

                                 By
                                   ---------------------------------------------

                                   ---------------------------------------------
                                   Its
                                      ------------------------------------------

                                      ORDER

     Pursuant to the parties' agreement referenced above, and for good cause
shown, this Court hereby dismisses this action in its entirety with prejudice,
and expressly reserves jurisdiction so that this Court may enforce the terms of
the Settlement Agreement effective as of May 7, 2002, a copy of which has been
filed under seal with this Court. Each party will bear its own costs.

         IT IS SO ORDERED.

                                       -----------------------------------------
                                       UNITED STATES DISTRICT JUDGE

<PAGE>

                                    EXHIBIT B

                          UNITED STATES DISTRICT COURT

                          FOR THE DISTRICT OF DELAWARE

-----------------------------------------
                                          )
JUPITER MEDIA METRIX, INC.                )   Civil Action No. 01-193- SLR
                                          )
                           Plaintiff,     )
v.                                        )
                                          )
NETRATINGS, INC. and                      )
NETVALUE USA, INC.,                       )
                                          )
                           Defendants.    )
                                          )
-----------------------------------------

                            [PROPOSED] SEALING ORDER

     The parties to this action have stipulated to reserve jurisdiction in this
Court for the purpose of enforcing the terms of a confidential settlement
agreement.

     Good cause appearing, the following documents shall be filed under seal in
order to permit the Court to refer to such documents, as appropriate:

     (1) A copy of the Stipulation and Order of Dismissal of Action With
Prejudice (the original of which is part of this Court's public file); together
with

     (2) A copy of the Settlement Agreement as executed by the Parties to this
action as of May 7, 2002.

     IT IS SO ORDERED.

Dated:  May __, 2002
                                       -----------------------------------------
                                       UNITED STATES DISTRICT JUDGE<PAGE>

                                                                   Exhibit 10.32

                         INTELLECTUAL PROPERTY AGREEMENT

This Intellectual Property Agreement (the "Agreement"), effective as of May 7,
2002, (the "Effective Date") is entered into by and between NetRatings, Inc., a
Delaware corporation, having its principal place of business at 890 Hillview
Court, Milpitas, California 95035 ("NetRatings"), and Jupiter Media Metrix, a
Delaware corporation with its principal place of business at 21 Astor Place, 6th
Floor New York, NY 10003 ("JMM").

                                    RECITALS

WHEREAS, this Agreement is being entered into pursuant to a Settlement Agreement
being executed concurrently herewith wherein JMM and NetRatings are comprising
any and all claims they have or may have with respect to Civil Action No.
01-193-SLR (the "Action"); and

WHEREAS, as contemplated by the Settlement Agreement and as part of the
settlement contemplated therein, the parties desire that each party shall have
rights in certain Covered Patents and certain other Intellectual Property as set
forth herein.

In consideration of the promises and mutual covenants herein contained,
NetRatings and JMM agree as follows:

                                    AGREEMENT

1.   Definitions. The following terms shall have the meanings set forth below:
     -----------

     1.1 "Closing Date" shall have the meaning set forth in the Asset Purchase
Agreement that the parties are executing concurrent with the execution of this
Agreement.

     1.2 "Covered Patents" shall mean the JMM patents and patent applications
(including all patents issuing therefrom) listed in Exhibit A ("JMM Patents") as
                                                    ---------
well as any patents claiming priority, in whole or in part, to either of the
foregoing, filed in any country, including utility models and registrations and
also including any reissues, divisions, re-examinations, renewals, extensions,
provisionals, continuations, continuations-in-part or counterparts thereof.

     1.3 "Encumbrances" shall mean restrictions on or conditions to transfer or
assignment, claims, liabilities, liens, pledges, mortgages or security interests
of any kind, whether accrued, absolute, contingent, or otherwise, affecting any
of the Subject IP.

     1.4 "Intellectual Property" shall mean United States and foreign patents
and utility models and applications therefor and all reissues, divisions,
re-examinations, renewals, extensions, provisionals, continuations,
continuations-in-part and counterparts thereof (the "Patents"); (ii) rights in
inventions (whether patentable or not), improvements, trade secrets, proprietary
information, know how, and any rights in technology, invention disclosures,
technical data and customer lists, and all documentation relating to any of the
foregoing; (iii) copyrights, copyrights registrations and applications therefor,
and all other rights corresponding thereto throughout the world; (iv) industrial
designs and any registrations and applications therefor; and (v) any similar or
equivalent rights to any of the foregoing (as applicable). Notwithstanding the
foregoing, Intellectual Property will not include any rights in Trademarks.

     1.5 "PC Meter Technology" shall mean the method and software for logging
and reporting on-line activity of computer users known as "PC Meter" an all
related database systems and technologies

<PAGE>

used with such method and software, as more particularly described in Exhibit B
("PC Meter Technology").

     1.6 "Quarter" shall mean a period of three (3) consecutive calendar months
commencing upon either January 1, April 1, July 1 or October 1. "Quarterly"
shall mean once per Quarter.

     1.7 "Subject IP" shall mean the Covered Patents and PC Meter Technology,
collectively.

     1.8 "Trademarks" shall mean trade names, logos, common law trademarks and
service marks, trademark, and service mark registrations, related goodwill and
applications therefor throughout the world, as well as domain names, uniform
resource locators, other names and locators associated with the Internet, and
applications or registrations therefor.

     1.9 "Year" shall mean a twelve (12) calendar month period beginning on
January 1.

2.   Assignment and Licenses.
     -----------------------

     2.1 Covered Patents.
         ---------------

         (a) Assignment to NetRatings. Effective upon the Closing Date, JMM
             ------------------------
hereby assigns to NetRatings all of JMM's rights, title and interest in and to
the Covered Patents. The foregoing assignments also include the right to sue for
infringement or misappropriation of the Covered Patents and collect damages for
past as well as future infringement and/or misappropriation of the Covered
Patents.

         (b) License Back to JMM. In consideration for and subject to the terms
             -------------------
and conditions of this Agreement, including but not limited to the payments
specified in Section 3.2 (JMM Consideration), NetRatings hereby grants to JMM
for a period beginning on the Closing Date through June 30, 2005, under all of
NetRatings' rights in the Covered Patents, the non-exclusive, non-sublicensable,
royalty-bearing, limited right to exploit the Covered Patents in any manner
necessary to conduct the JMM Business (as defined in Section 6.2 (By JMM)) in
the United States. The foregoing license is transferable and assignable so long
as the transferee, assignee or successor in interest (collectively referred to
as "Transferee") agrees in writing to be bound by all the terms applicable to
this license, including but not limited to Section 3.2 (JMM Consideration).

     2.2 PC Meter Technology. JMM hereby grants to NetRatings (including any
         -------------------
consultants and contractors working on NetRatings' behalf), under all of JMM's
Intellectual Property in and to the PC Meter Technology, the non-exclusive,
irrevocable, perpetual, royalty-free, fully-paid up license (including the right
to sublicense through multiple tiers) to use, reproduce, distribute, publicly
perform, publicly display, prepare derivative works based upon and otherwise
exploit the PC Meter Technology in any manner (including without limitation,
combining, embedding or integrating the PC Meter Technology, or any portion
thereof, with or into any other software), in both source code and object code
form. NetRatings shall be the sole owner of all Intellectual Property in and to
any derivative works of the PC Meter Technology it creates or has created on its
behalf. NetRatings agrees that any sublicense of the PC Meter Technology shall
be pursuant to license terms that are no less protective of JMM's Intellectual
Property in and to such PC Meter Technology as those that NetRatings imposes on
licensees of its own proprietary software.

     2.3 Delivery. Promptly after the Closing Date, JMM shall deliver to
         --------
NetRatings, at a location and in a format specified by NetRatings: (a) a copy of
the object code and fully documented source code for all versions of the PC
Meter Technology; and (b) copies of all documents in JMM's possession or control
relating to the Covered Patents and PC Meter Technology.

                                       2

<PAGE>

     2.4 Reservation of Rights. Except as specifically stated in this Agreement,
         ---------------------
nothing contained in this Agreement shall be construed as conferring on a party
any license or other right, by implication, estoppel or otherwise to any other
Intellectual Property or Trademarks of the other party.

3.   Payment Terms.
     -------------

     3.1 NetRatings Consideration. The parties acknowledge and agree that the
         ------------------------
consideration provided for in Article 2 of the Settlement Agreement constitutes
adequate consideration for, among other things, the assignment to NetRatings of
the rights granted in Section 2.1 ("Assignment of Rights").

3.2  JMM Consideration.
     -----------------

     (a) Fee. In consideration of the license granted by NetRatings to JMM in
         ---
Section 2.1(b) (License Back to JMM), JMM shall pay NetRatings the following
amounts:

         (i) for each of the three (3) calendar months beginning on July 1,
2002, a non-refundable, irrevocable fee of $125,000 per month, payable in
advance by the tenth (10th) day of each month;

         (ii) for the Quarter beginning on October 1, 2002, a non-refundable,
irrevocable fee of $375,000, payable in advance by the tenth (10th) day of the
Quarter;

         (iii) for each Year of the license's duration starting January 1, 2003,
an annual fee equal to $1,500,000.00 in the first Year and $1,750,000 in the
second Year, payable in advance on a Quarterly basis by the tenth (10th) of each
Quarter with each such Quarterly payment being non-refundable and irrevocable;
and

         (iv) for the period from January 1, 2005 until June 30, 2005, a
non-refundable, irrevocable fee of $500,000 per Quarter, payable in advance by
the tenth (10th) day of the Quarter.

     (b) Taxes. JMM shall be responsible for all sales taxes, use taxes,
         -----
withholding taxes, value added taxes, import and export taxes and any other
similar taxes imposed by any United States' federal, state, provincial or local
governmental entity or any non-US government entity on the transactions
contemplated by this Agreement, excluding taxes based on NetRatings' net income.

4.   Prosecution, Maintenance and Enforcement of Patents.
     ---------------------------------------------------

     4.1 Prosecution Rights. On and after the Closing Date, the expenses for
         ------------------
prosecuting each Covered Patent (including without limitation any taxes,
annuities and maintenance fees for any pending application and/or issued patent
corresponding to each Covered Patent), and for the issuance of the respective
patent shall be borne by NetRatings. JMM agrees to furnish NetRatings with all
documents and other assistance, as such may be necessary, for the prosecution of
each application. JMM agrees that it will not challenge the validity or
enforceability of the Covered Patents, and will not assist, assign or cooperate,
directly or indirectly, in (i) challenging the validity or enforceability of any
claims of the Covered Patents in any action or (ii) defending any third party in
an infringement action asserted by NetRatings related to the Covered Patents.

     4.2 Notification of Infringement. JMM shall promptly inform NetRatings of
         ----------------------------
any suspected infringement of any of the Covered Patents by a third party.

                                       3

<PAGE>

     4.3 Further Assurances. JMM shall perform all acts deemed necessary or
         ------------------
desirable by NetRatings to permit and assist NetRatings, at NetRatings' expense,
in perfecting and enforcing its rights throughout the world in the Covered
Patents. Such acts may include, but are not limited to, execution of documents
and assistance or cooperation in the registration and enforcement, including
litigation, of the Covered Patents or other legal proceedings. Concurrent with
the execution of this Agreement, NetRatings shall receive from JMM assignments
substantially in the form of Exhibit C-1 ("Patent Assignment") with respect to
                             -----------
the Covered Patents, duly executed on behalf of JMM by an officer and notarized,
and in a form acceptable for recording with the United States Patent and
Trademark Office and any patent office in any other jurisdiction, as applicable.
In the event that NetRatings is unable for any reason whatsoever to secure a
signature to any document it believes is reasonably required in order to apply
for or execute any paper with respect to the Covered Patents (including
improvements, renewals, extensions, continuations, divisions or continuations in
part thereof), JMM hereby irrevocably designate and appoint NetRatings and its
duly authorized officers and agents as NetRatings' agents and its
attorneys-in-fact to act for and on its behalf and instead of it, to execute and
file any such paper and to do all other lawfully permitted acts to further the
prosecution and issuance of patents or other rights therein in the Covered
Patents with the same legal force and effect as if executed by NetRatings.

     4.4 Disclosure of Information. JMM will not disclose to any third party any
         -------------------------
information it has obtained in connection with the prosecution of the Covered
Patents. Notwithstanding the foregoing, if JMM is served with a subpoena or
court order requiring the disclosure of information relating to any Covered
Patent, JMM shall promptly notify NetRatings and cooperate, at NetRatings'
expense, in obtaining enough time for NetRatings to object to such disclosure,
move for a protective order, seek to limit such production of information and/or
to quash the subpoena.

5.   Warranties.
     ----------

     5.1 Ownership. JMM owns all the Subject IP, free and clear of all
         ---------
Encumbrances and any exclusive licenses or rights to use the same, and JMM is
not a joint owner of any portion of the Subject IP with any third party. All
designs, drawings, specifications, source code, object code, documentation, flow
charts and diagrams incorporated, embodied or reflected in any Subject IP at any
stage of its development were written, developed and created solely and
exclusively by employees of JMM without the assistance of any third party.

     5.2 Disclosure. Exhibits A ("JMM Patents") contain an accurate and complete
         ----------  ----------
list of all jurisdictions in which each Covered Patent has been issued or
registered or in which any such application for such issuance or registration
has been filed (collectively, the "Intellectual Property Registrations").

     5.3 Licenses to and from Third Parties. As of the Effective Date, Section
         ----------------------------------
5.3 of Exhibit D ("Disclosure Schedule") attached hereto (the "Disclosure
       ---------
Schedule") lists (i) licenses, sublicenses or any other agreements pursuant to
which any third party is authorized to use any Covered Patents ("Third Party
Out-Bound Licenses") and (ii) all licenses, sublicenses and other agreements
with third parties (the "Third Party In-Bound Licenses") to which JMM is a party
and pursuant to which JMM is authorized to use any Intellectual Property owned
by a third party and which is used by JMM in the manufacture of, incorporated in
or forms a part of any Covered Patents or PC Meter Technology. To the knowledge
of JMM, no third party subject to a Third Party Out-Bound License is in breach
or default of such Third Party Out-Bound License.

     5.4 No Conflicts or Consents. The execution and delivery of this Agreement,
         ------------------------
compliance with its terms and the consummation of the transactions contemplated
hereby do not and will not conflict with, or result in any violation or breach
of, or default (with or without notice or lapse of time or both) or give rise to
any right, license or Encumbrance relating to the Subject IP, or right of
termination,

                                       4

<PAGE>

cancellation or acceleration of any Subject IP, or the loss or Encumbrance of
any Subject IP or material benefit related thereto, or result in or require the
creation, imposition or extension of any Encumbrance upon any Subject IP or
otherwise impair the right of NetRatings, its subsidiaries or affiliated
companies, or its customers to use the Subject IP as contemplated by this
Agreement. Except as set forth in Section 5.4 of the Disclosure Schedule, no
consent, approval, order or authorization of, or registration, declaration or
filing with, any third party or any governmental authority is required to be
obtained on the part of JMM to permit the consummation of the transactions
contemplated by this Agreement.

     5.5 No Notice of Claims. JMM (i) has not received notice that it has been
         -------------------
sued in any suit, action or proceeding which involves a claim of infringement of
any portion of the Subject IP; and (ii) has no knowledge of any claim
challenging or questioning the validity or effectiveness of any license or
agreement relating to any Subject IP or Third Party In-Bound License. Except
with respect to the Action, there is no outstanding order, writ, injunction,
decree, judgment or stipulation by or with any court, administrative agency or
arbitration panel regarding patent, copyright, trade secret, trademark, trade
name, mask work right or other claims relating to the Subject IP to which JMM is
a party or by which it is bound.

     5.6 Protection of Confidential Information. JMM has taken all reasonable
         --------------------------------------
measures and precautions to protect and maintain the confidentiality, secrecy
and value of all material trade secrets or confidential information included in
the Covered Patents (except whose value would not be impaired by disclosure).
Without limiting the generality of the foregoing, all current and former
employees of JMM who are or were involved in, or who have contributed to, the
creation or development of any portion of the Covered Patents have executed and
delivered to JMM an agreement that is substantially identical to the form of
confidential information and invention assignment agreement previously delivered
by JMM to NetRatings. No current or former employee, officer, director,
stockholder, consultant or independent contractor has any right, claim or
interest in or with respect to any Covered Patent.

     5.7 Maintenance Fees. Section 5.7 of the Disclosure Schedule lists all
        -----------------
Intellectual Property Registrations for which maintenance fees and/or annuities
are due (and have not yet been paid) in any jurisdiction in which such
Intellectual Property Registration has been filed at any time through the end of
the first two (2) full calendar quarters after the Closing Date or for which any
action must be taken under the Patent Cooperation Treaty or in any jurisdiction
in which such Intellectual Property Registration has been filed in order to
preserve any rights in or to the Covered Patents at any time in such period.

6.   Termination of License Back
     ---------------------------

     6.1 By NetRatings. In the event that JMM breaches any material provision of
         -------------
this Agreement and fails to cure such breach within thirty (30) days after
receiving written notice thereof from NetRatings, the license back granted to
JMM pursuant to Section 2.1(b) (License Back to JMM) shall be deemed terminated
effective upon the expiration of such thirty (30) day period. Within thirty (30)
days after the effective termination of such license back, JMM shall pay
NetRatings all monthly and Quarterly payments accrued through the effective
termination date of such license.

     6.2 By JMM. In the event JMM (or its Transferee) intends to cease the
         ------
conduct of the JMM Business, and only in such event, JMM (or its Transferee) may
terminate the license it received pursuant to Section 2.1(b) (License Back to
JMM), together with all corresponding payment obligations hereunder, upon thirty
(30) days written notice to NetRatings (the "Notice Period"). Notwithstanding
any termination of such license to JMM, unless prior to the commencement of the
next succeeding month or Quarter, as applicable, (i) the Notice Period expires
and (ii) JMM (or its Transferee) has certified in writing to NetRatings that it
---
has ceased the conduct of the JMM Business, JMM shall be liable for the payment
corresponding to such succeeding month or Quarter, as specified in Section
3.2(a) (Fee). Under

                                       5

<PAGE>
no circumstances shall JMM receive any refund of any monthly or Quarterly
payments paid through the effective termination date of the license. For
purposes of this Agreement, "JMM Business" shall mean the provision of research,
advisory and measurement products and services based primarily on the collection
of internet audience measurement data by JMM (or any Transferee) to persons who
are either (a) customers of JMM on the date of this Agreement who are not also
customers of any Transferee or its affiliates on the date of this Agreement
(whether the revenue is derived from existing contracts, extensions or renewals
or modifications thereof, or from new contracts with the same customers) or (b)
customers to whom JMM (including any Transferee) provides such products and
services with the use of the Covered Patent.

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

     7.1 Jointly Negotiated. The parties hereby agree that this Agreement has
         ------------------
been jointly negotiated and drafted by the parties and that it shall not be
construed either for or against either party based upon the party who drafted
any part of it.

     7.2 Governing Law. This Agreement, any dispute arising under or which is
         -------------
related to this Agreement (whether in contract, tort or otherwise), and the
validity, performance and interpretation of this Agreement shall be governed by
and construed in all respects under, the laws of the United States of America
and the State of Delaware without giving effect to its conflicts of law
principles.

     7.3 No Waiver. No term or provision hereof will be considered waived by
         ---------
either party, and no breach excused by either party, unless such waiver or
consent is in writing signed on behalf of the party against whom the waiver is
asserted. No consent by either party to, or waiver of, a breach by either party,
whether express or implied, will constitute a consent to, waiver of, or excuse
of any other, different, or subsequent breach by either party.

     7.4 Assignment. Nothing in this Agreement shall be deemed to prohibit or
         ----------
otherwise limit NetRatings' ability to assign any rights or delegate any
obligations under this Agreement. This Agreement shall benefit and bind the
permitted successors and assigns of NetRatings.

     7.5 Notices. All notices required to be given under this Agreement shall be
         -------
in writing and delivered to the parties at their respective addresses set forth
below (or such other address as specified by either party in accordance with the
provisions of this section) by (i) hand delivery, (ii) nationally recognized
overnight courier, (iii) mailed postage prepaid by certified or registered mail,
return receipt requested, or (iv) facsimile transmission with verification of
receipt, and will be deemed to be effective the day of delivery by hand or
overnight courier, the day of transmission if sent by facsimile, or three (3)
days after mailing if sent by mail:

                                       6

<PAGE>

If to NetRatings:     NetRatings, Inc.
                      890 Hillview Court
                      Milpitas, CA 95035
                      Attention:  General Counsel
                      Facsimile No.: 408-586-0208

With a Copy to:       Gray Cary Ware & Freidenrich LLP
                      400 Hamilton Avenue
                      Palo Alto, CA 94301
                      Attention:  Mark F. Radcliffe, Esq.
                      Facsimile No.:  650-833-2001

If to JMM:            Jupiter Media Metrix, Inc.
                      21 Astor Place, 6th Floor
                      New York, NY 10003
                      Attention:  Chief Executive Officer
                      Facsimile No.:  917-534-6809
                      Attention:  General Counsel

With a Copy to:       Brobeck, Phleger & Harrison LLP
                      1633 Broadway, 47th Floor
                      New York, NY 10019
                      Attention:  Richard H. Gilden, Esq.
                      Facsimile No.:  212-586-7878

     7.6  Severability. In the event that any court or arbitrator having
          ------------
jurisdiction shall determine that any provision contained in this Agreement
shall be unreasonable or unenforceable in any respect, then such provision shall
be deemed limited to the extent that such court or arbitrator deems it
reasonable and enforceable, and as so limited shall remain in full force and
effect. In the event that such court or arbitrator shall deem any such provision
wholly unenforceable, the remaining provisions of this Agreement shall
nevertheless remain in full force and effect.

     7.7  Independent Contractors. In the course of performing under this
          -----------------------
Agreement, each of the parties will operate as, and have the status of, an
independent contractor and will not act as or be an agent, partner, co-venturer,
employee or fiduciary of the other party. Neither party will have the right or
authority to assume or create any obligations or to make any representations or
warranties on behalf of any other party, whether express or implied, or to bind
the other party in any respect whatsoever.

     7.8  Section Headings. The section headings appearing in this Agreement are
          ----------------
inserted only as a matter of convenience and in no way define, limit, construe
or describe the scope or extent of such section or in any way affect this
Agreement. The plural shall be deemed to include the singular, and the singular
shall be deemed to include the plural.

     7.9  Attorneys' Fees. In the event any proceeding or lawsuit is brought
          ---------------
against any party to this Agreement in connection with this Agreement, the
prevailing party will be entitled to recover its costs and expenses, including
expert witness' fees and attorneys' fees.

     7.10 Limitation of Liability. IN NO EVENT SHALL EITHER PARTY BE LIABLE TO
          -----------------------
THE OTHER PARTY FOR ANY SPECIAL, INCIDENTAL, CONSEQUENTIAL OR EXEMPLARY

                                       7

<PAGE>

DAMAGES ARISING OUT OF ANY PERFORMANCE OF THIS AGREEMENT AND NEITHER PARTY'S
SUPPLIERS SHALL BE LIABLE FOR ANY DAMAGES INCLUDING, BUT NOT LIMITED TO,
SPECIAL, INCIDENTAL, CONSEQUENTIAL OR EXEMPLARY DAMAGES. ALL OF THE ABOVE LISTED
LIMITATIONS APPLY REGARDLESS OF THE FORM OF ACTION, WHETHER IN CONTRACT, TORT
(INCLUDING NEGLIGENCE), STRICT PRODUCT LIABILITY OR OTHERWISE, EVEN IF A PARTY
HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

     7.11 Scope of Agreement; Amendment. The parties hereto acknowledge that
          -----------------------------
each has read this Agreement and all Exhibits hereto, understands it, and agrees
to be bound by its terms. The parties further agree that this Agreement is the
complete and exclusive statement of agreement and supersedes all prior or
contemporaneous proposals (oral or written), understandings, representations,
agreements, conditions, warranties, covenants, and other communications between
the parties relating hereto relating to the subject matter of this Agreement.
This Agreement may be amended only by a subsequent writing that specifically
refers to this Agreement and is signed by both parties, and no other act,
document, usage, or custom shall be deemed to amend this Agreement. If there is
any conflict between the terms of this Agreement and any pre-existing
non-disclosure agreement between the parties, the terms of this Agreement shall
control.

IN WITNESS WHEREOF, the parties hereto have signed this Agreement by their
authorized representatives.

<TABLE>
<CAPTION>
Agreed to:                                 Agreed to:
<S>                                        <C>
NETRATINGS, INC.                           JUPITER MEDIA METRIX

By: /s/ William Pulver                     By: /s/ Robert Becker

Name: William Pulver                       Name: Robert Becker

Title: President and                       Title: President and
       Chief Executive Officer                    Chief Executive Officer

Date: May 7, 2002                          Date: May 7, 2002

</TABLE>

                                       8

<PAGE>

                                    EXHIBIT A
                                    ---------

                                   JMM Patents
                                   -----------

U.S. Patent No. 6,115,680
U.S. Patent No. 5,676,510

                                       9

<PAGE>

                                    EXHIBIT B
                                    ---------

                               PC Meter Technology
                               -------------------

"PC Meter Technology" shall mean all legal and equitable rights, title and
interest JMM has in any and all intellectual property, trade secrets and
proprietary information ,including know-how and copyrights regarding JMM's
systems and methods for logging and reporting on-line activity of computer
users, including without limitation (a) the full and complete source code, to
the extent it exists, for all versions and for all platforms of the software
known as of the Closing Date as "PC Meter"; and (b) the full and complete source
code for all versions of JMM's database systems, and related technologies, used
with the PC Meter software.

                                       10

<PAGE>

                                   EXHIBIT C-1
                                   -----------

                               Patent Assignment
                               -----------------

                           PATENT ASSIGNMENT AGREEMENT

     WHEREAS, the undersigned, Jupiter Media Metrix, Inc., a Delaware
corporation having a place of business at 21 Astor Place, 6th Floor, New York,
NY 10003 ("Assignor") is the owner of the entire right, title and interest in
the patent properties listed on Schedule A (the "Assigned Patent Properties");
                                ----------
and

     WHEREAS, NetRatings, Inc., a Delaware corporation having a place of
business at 890 Hillview Court, Milpitas, California 95035 ("Assignee"), is
desirous of acquiring the Assigned Patent Properties and any rights in the
Assigned Patent Properties for good and valuable consideration set forth in the
Intellectual Property Agreement executed between Assignor and Assignee dated May
7, 2002.

     NOW, THEREFORE, in consideration of good and valuable consideration
acknowledged by Assignor to have been received in full from Assignee:

     1. Effective upon execution, Assignor does hereby sell, assign, transfer
and convey unto Assignee, all of their right, title and interest together with
the benefits and privileges in and to all inventions and discoveries set forth
in the Assigned Patent Properties;

     2. Assignor hereby covenants and agrees to cooperate with Assignee to
enable Assignee to obtain, sustain, enforce and enjoy to the fullest extent all
right, title and interest herein conveyed in any country. Such cooperation by
Assignor shall include production of pertinent facts and documents, giving of
testimony, execution of petitions, oaths, specifications, declarations or other
papers, and other assistance all to the extent deemed reasonably necessary or
desirable by Assignee, (a) for perfecting in Assignee the right, title and
interest herein conveyed; (b) for filing and prosecuting substitute, divisional,
continuing or additional applications covering the Assigned Patent Properties;
(c) for filing and prosecuting applications for re-issuance of any of the
Assigned Patent Properties; (d) for interference or other priority proceedings
involving the Assigned Patent Properties; and (e) for legal proceedings
involving the Assigned Patent Properties for infringement actions and court
actions; provided, however, that the expense incurred by Assignor in providing
such cooperation shall be paid for by Assignee. In the event that Assignee is
unable for any reason to secure Assignor's signature to any document required to
apply for or execute any patent applications or patents (including improvements,
renewals, extensions, continuations, divisions or continuations in part
thereof), Assignor hereby irrevocably designates and appoints Assignee and its
duly authorized officers and agents as Assignor's agent and attorney-in-fact to
act for and in their behalf, and instead of Assignor, to execute and file any
such applications and to do all other lawfully permitted acts to further the
perfection, prosecution and issuance of patents or other rights therein with the
same legal force and effect as if executed by Assignor.

     3. Assignor warrants that it has not knowingly conveyed and shall not
convey to others any rights in said inventions, discoveries, applications,
patents or Assigned Patent Properties; and warrants it has good right to assign
the same to Assignee without encumbrance.

     4. The terms and covenants of this Patent Assignment Agreement shall inure
to the benefit of Assignee, its successors and assigns, and shall be binding
upon Assignor and its successors and assigns.

                                       11

<PAGE>

     IN WITNESS WHEREOF, Assignor has executed and delivered this instrument to
Assignee effective the 7th day of May, 2002.

ASSIGNOR:   Jupiter Media Metrix, Inc.

Today's
Date: May 7, 2002         By:  /s/ Robert Becker
                                   Title: President and Chief Executive Officer

STATE OF CALIFORNIA    )
                       )  ss.
COUNTY OF              )

     On ______________________ before me, ______________________, Notary Public,
personally appeared ____________________________, personally known or proved to
me on the basis of satisfactory evidence to be the person whose name is
subscribed to the within instrument and acknowledged to me that he/she executed
the same in his/her authorized capacity and that by his/her signature on the
instrument the person, or the entity upon behalf of which the person acted,
executed the instrument.

         Witness my hand and official seal.

                           -------------------------------------
         Notary Public

                                       12

<PAGE>

                                   Schedule A
                                   ----------

                           Assigned Patent Properties

U.S. Patent No. 6,115,680
U.S. Patent No. 5,676,510

                                       13

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