Document:

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                                                                     EXHIBIT 4.1

                         REGISTRATION RIGHTS AGREEMENT

     This Registration Rights Agreement (this "Agreement") is made and entered
into as of May 15, 2000, by GenStar Therapeutics Corporation, a Delaware
corporation (the "Company"), for the benefit of the individuals and entities
listed on Exhibit A hereto (each a "Holder").

                                   RECITALS

     A.   The Company and Allegro Cell Systems, Inc., a Delaware corporation
("Allegro"), entered into an Acquisition Agreement and Plan of Merger dated May
15, 2000 (the "Merger Agreement"), providing for the acquisition of Allegro by
the Company via the merger of Allegro with and into the Company.

     B.   Pursuant to Section 5.4 of the Merger Agreement, the Company has
agreed to extend registration rights to the Holders, subject to certain
limitations upon the transfer of shares so registered, as more fully set forth
herein.

     NOW, THEREFORE, in consideration of the mutual promises, representations,
warranties, covenants and conditions set forth in this Agreement and in the
Merger Agreement, the parties hereby agree as follows:

Section 1.  General.
            -------

       1.1  Definitions.  As used in this Agreement, the following terms shall
            -----------
have the following respective meanings:

            "Exchange Act" means the Securities Exchange Act of 1934, as
amended.

            "Holder" means each of the individuals and entities listed on
Exhibit A hereto.

            "Registrable Securities" means (i) Common Stock of the Company
issued to the Holders pursuant to the Merger Agreement, and (ii) any Common
Stock of the Company issued as (or issuable upon the conversion or exercise of
any warrant, right or other security which is issued as) a dividend or other
distribution with respect to, or in exchange for or in replacement of, such
above-described securities. Notwithstanding the foregoing, Registrable
Securities shall not include any securities sold by a Holder to the public
either pursuant to a registration statement or Rule 144 or sold in a private
transaction in which the transferor's rights under Section 2 of this Agreement
are not assigned.

            "Registration Expenses" shall mean all expenses incurred by the
Company in complying with Section 2.2 and 2.3 hereof, including, without
limitation, all registration and filing fees, printing expenses, fees and
disbursements of counsel for the Company, reasonable fees and disbursements not
to exceed Ten Thousand Dollars ($10,000.00) of a single special counsel for the
Holders, blue sky fees and expenses and the expense of any special audits
incident to or required by any such registration (but excluding the compensation
of regular employees of the Company which shall be paid in any event by the
Company).
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            "SEC" means the Securities and Exchange Commission.

            "Securities Act" shall mean the Securities Act of 1933, as amended.

            "Selling Expenses" shall mean all underwriting discounts and selling
commissions applicable to the sale of Registrable Securities.

Section 2.  Registration; Restrictions on Transfer.
            --------------------------------------

       2.1  Restrictions on Transfer of Registrable Securities.  As a condition
            --------------------------------------------------
precedent to the inclusion of any Holder's Registrable Securities in a
registration statement under Section 2.2 or 2.3 hereof, such Holder shall be
required to execute a "lockup" agreement, in form and substance acceptable to
the Company, providing that for the Lockup Period (as defined below) applicable
to such registration statement, such Holder shall not, directly or indirectly,
by operation of law or otherwise, sell, donate, transfer, assign, exchange,
encumber, pledge, alienate or otherwise dispose of all or any part of such
Holder's Registrable Securities so registered.  Any Holder not executing such a
"lockup" agreement shall not be entitled to registration rights hereunder.  The
"Lockup Period" shall mean (i) one hundred eighty (180) days after the effective
date of a registration statement filed on or before ninety (90) days from the
date of this Agreement, and (ii) ninety (90) days after the effective date of a
registration statement filed on or after ninety-one (91) days from the date of
this Agreement.

       2.2  Best Efforts to File Registration Statement.  The Company shall use
            -------------------------------------------
its best efforts to prepare and file, within one hundred eighty (180) days after
the effective time of the Merger, a registration statement under the Securities
Act covering the registration of all of the Registrable Securities, and shall
thereafter use its best efforts to cause such registration statement to be
declared effective as expeditiously as possible.

       2.3  Piggyback Registration Rights.  The Company shall notify all Holders
            -----------------------------
of Registrable Securities in writing at least fifteen (15) days prior to the
filing of any registration statement under the Securities Act for purposes of a
public offering of securities of the Company (including, but not limited to,
registration statements relating to secondary offerings of securities of the
Company, but excluding registration statements relating to employee benefit
plans or with respect to corporate reorganizations or other transactions under
Rule 145 of the Securities Act) and will afford each such Holder an opportunity
to include in such registration statement all or part of such Registrable
Securities held by such Holder. Each Holder desiring to include in any such
registration statement all or any part of the Registrable Securities held by it
shall, within ten (10) days after the above-described notice from the Company,
so notify the Company in writing. Such notice shall state the intended method of
disposition of the Registrable Securities by such Holder. If a Holder decides
not to include all of its Registrable Securities in any registration statement
thereafter filed by the Company, such Holder shall nevertheless continue to have
the right to include any Registrable Securities in any subsequent registration
statement or registration statements as may be filed by the Company with respect
to offerings of its securities, all upon the terms and conditions set forth
herein.

          (a)  Underwriting. If the registration statement under which the
               ------------
Company gives notice under this Section 2.3 is for an underwritten offering, the
Company shall so advise

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the Holders of Registrable Securities. In such event, the right of any such
Holder to be included in a registration pursuant to this Section 2.3 shall be
conditioned upon such Holder's participation in such underwriting and the
inclusion of such Holder's Registrable Securities in the underwriting to the
extent provided herein. All Holders proposing to distribute their Registrable
Securities through such underwriting shall enter into an underwriting agreement
in customary form with the underwriter or underwriters selected for such
underwriting by the Company. Notwithstanding any other provision of the
Agreement, if the underwriter determines in good faith that marketing factors
require a limitation of the number of shares to be underwritten, the number of
shares that may be included in the underwriting shall be allocated, first, to
the Company; second, to the Holders on a pro rata basis based on the total
number of Registrable Securities held by the Holders; and third, to any
stockholder of the Company (other than a Holder) on a pro rata basis. No such
reduction shall (i) reduce the securities being offered by the Company for its
own account to be included in the registration and underwriting or (ii) reduce
the amount of securities of the selling Holders included in the registration
below twenty-five percent (25%) of the total amount of securities included in
such registration. If any Holder disapproves of the terms of any such
underwriting, such Holder may elect to withdraw therefrom by written notice to
the Company and the underwriter, delivered at least ten (10) business days prior
to the effective date of the registration statement. Any Registrable Securities
excluded or withdrawn from such underwriting shall be excluded and withdrawn
from the registration. For any Holder which is a partnership or corporation, the
partners, retired partners and stockholders of such Holder, or the estates and
family members of any such partners and retired partners and any trusts for the
benefit of any of the foregoing person shall be deemed to be a single "Holder",
and any pro rata reduction with respect to such "Holder" shall be based upon the
aggregate amount of shares carrying registration rights owned by all entities
and individuals included in such "Holder," as defined in this sentence.

          (b)  Right to Terminate Registration.  The Company shall have the
               -------------------------------
right to terminate or withdraw any registration initiated by it under this
Section 2.3 prior to the effectiveness of such registration whether or not any
Holder has elected to include securities in such registration. The Registration
Expenses of such withdrawn registration shall be borne by the Company in
accordance with Section 2.4 hereof.

     2.4  Expenses of Registration.  Except as specifically provided herein,
          ------------------------
all Registration Expenses incurred in connection with any registration hereunder
shall be borne by the Company. All Selling Expenses incurred in connection with
any registration hereunder shall be borne by the holders of the securities so
registered pro rata on the basis of the number of shares so registered.

     2.5  Obligations of the Company.  Whenever effecting a registration of any
          --------------------------
Registrable Securities hereunder, the Company shall, as expeditiously as
reasonably possible:

          (a)  With respect to a registration statement filed relating to
Registrable Securities, keep such registration statement effective for up to one
(1) year following the expiration of the applicable Lockup Period or, if
earlier, until the Holder or Holders of such Registrable Securities have
completed the distribution thereof.

          (b)  Prepare and file with the SEC such amendments and supplements to
such registration statement and the prospectus used in connection with such
registration statement as

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may be necessary to comply with the provisions of the Securities Act with
respect to the disposition of all securities covered by such registration
statement for the period set forth in paragraph (a) above.

          (c)  Furnish to the Holders such number of copies of a prospectus,
including a preliminary prospectus, in conformity with the requirements of the
Securities Act, and such other documents as they may reasonably request in order
to facilitate the disposition of Registrable Securities owned by them.

          (d)  Use its reasonable best efforts to register and qualify the
securities covered by such registration statement under such other securities or
Blue Sky laws of such jurisdictions as shall be reasonably requested by the
Holders; provided that the Company shall not be required in connection therewith
or as a condition thereto to qualify to do business or to file a general consent
to service of process in any such states or jurisdictions.

          (e)  In the event of any underwritten public offering, enter into and
perform its obligations under an underwriting agreement, in usual and customary
form, with the managing underwriter(s) of such offering. Each Holder
participating in such underwriting shall also enter into and perform its
obligations under such an agreement.

          (f)  Cause all such Registrable Securities registered pursuant
hereunder to be listed on each securities exchange on which similar securities
issued by the Company are then listed.

          (g)  Provide a transfer agent and registrar for all Registrable
Securities registered hereunder and a CUSIP number for all such Registrable
Securities, in each case not later than the effective date of such registration.

     2.6  Termination of Registration Rights.  All registration rights granted
          ----------------------------------
under this Section 2 shall terminate and be of no further force and effect on
the date five (5) years after the date of this Agreement. In addition, a
Holder's registration rights shall expire if all Registrable Securities held by
and issuable to such Holder (and its affiliates, partners, former partners,
members and former members) may be sold under Rule 144 during any ninety (90)
day period.

     2.7  Delay of Registration; Furnishing Information.
          ---------------------------------------------

          (a)  No Holder shall have any right to obtain or seek an injunction
restraining or otherwise delaying any such registration as the result of any
controversy that might arise with respect to the interpretation or
implementation of this Section 2.

          (b)  It shall be a condition precedent to the obligations of the
Company to take any action pursuant to Section 2.2 or 2.3 that the selling
Holders shall furnish to the Company such information regarding themselves, the
Registrable Securities held by them and the intended method of disposition of
such securities as shall be required to effect the registration of their
Registrable Securities.

     2.8  Indemnification.  In the event any Registrable Securities are included
          ---------------
in a registration statement under Section 2.2 or 2.3:

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          (a)  To the extent permitted by law, the Company will indemnify and
hold harmless each Holder, the partners, officers and directors of each Holder,
any underwriter (as defined in the Securities Act) for such Holder and each
person, if any, who controls such Holder or underwriter within the meaning of
the Securities Act or the Exchange Act, against any losses, claims, damages, or
liabilities (joint or several) to which they may become subject under the
Securities Act, the Exchange Act or other federal or state law, insofar as such
losses, claims, damages or liabilities (or actions in respect thereof) arise out
of or are based upon any of the following statements, omissions or violations
(collectively a "Violation") by the Company: (i) any untrue statement or alleged
untrue statement of a material fact contained in such registration statement,
including any preliminary prospectus or final prospectus contained therein or
any amendments or supplements thereto, (ii) the omission or alleged omission to
state therein a material fact required to be stated therein, or necessary to
make the statements therein not misleading, or (iii) any violation or alleged
violation by the Company of the Securities Act, the Exchange Act, any state
securities law or any rule or regulation promulgated under the Securities Act,
the Exchange Act or any state securities law in connection with the offering
covered by such registration statement; and the Company will pay as incurred to
each such Holder, partner, officer, director, underwriter or controlling person
for any legal or other expenses reasonably incurred by them in connection with
investigating or defending any such loss, claim, damage, liability or action;
provided however, that the indemnity agreement contained in this Section 2.8(a)
shall not apply to amounts paid in settlement of any such loss, claim, damage,
liability or action if such settlement is effected without the consent of the
Company, which consent shall not be unreasonably withheld, nor shall the Company
be liable in any such case for any such loss, claim, damage, liability or action
to the extent that it arises out of or is based upon a Violation which occurs in
reliance upon and in conformity with written information furnished expressly for
use in connection with such registration by such Holder, partner, officer,
director, underwriter or controlling person of such Holder.

          (b)  To the extent permitted by law, each Holder will, if Registrable
Securities held by such Holder are included in the securities as to which such
registration qualifications or compliance is being effected, indemnify and hold
harmless the Company, each of its directors, its officers and each person, if
any, who controls the Company within the meaning of the Securities Act, any
underwriter and any other Holder selling securities under such registration
statement or any of such other Holder's partners, directors or officers or any
person who controls such Holder, against any losses, claims, damages or
liabilities (joint or several) to which the Company or any such director,
officer, controlling person, underwriter or other such Holder, or partner,
director, officer or controlling person of such other Holder may become subject
under the Securities Act, the Exchange Act or other federal or state law,
insofar as such losses, claims, damages or liabilities (or actions in respect
thereto) arise out of or are based upon any Violation, in each case to the
extent (and only to the extent) that such Violation occurs in reliance upon and
in conformity with written information furnished by such Holder under an
instrument duly executed by such Holder and stated to be specifically for use in
connection with such registration; and each such Holder will pay as incurred any
legal or other expenses reasonably incurred by the Company or any such director,
officer, controlling person, underwriter or other Holder, or partner, officer,
director or controlling person of such other Holder in connection with
investigating or defending any such loss, claim, damage, liability or action if
it is judicially determined that there was such a Violation; provided, however,
that the indemnity agreement contained in this Section 2.8(b) shall not apply to
amounts paid in settlement of any such loss,

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claim, damage, liability or action if such settlement is effected without the
consent of the Holder, which consent shall not be unreasonably withheld;
provided further, that in no event shall any indemnity under this Section 2.8
exceed the net proceeds from the offering received by such Holder.

          (c)  Promptly after receipt by an indemnified party under this Section
2.8 of notice of the commencement of any action (including any governmental
action), such indemnified party will, if a claim in respect thereof is to be
made against any indemnifying party under this Section 2.8, deliver to the
indemnifying party a written notice of the commencement thereof and the
indemnifying party shall have the right to participate in, and, to the extent
the indemnifying party so desires, jointly with any other indemnifying party
similarly noticed, to assume the defense thereof with counsel mutually
satisfactory to the parties; provided, however, that an indemnified party shall
have the right to retain its own counsel, with the fees and expenses to be paid
by the indemnifying party, if representation of such indemnified party by the
counsel retained by the indemnifying party would be inappropriate due to actual
or potential differing interests between such indemnified party and any other
party represented by such counsel in such proceeding. The failure to deliver
written notice to the indemnifying party within a reasonable time of the
commencement of any such action, if materially prejudicial to its ability to
defend such action, shall relieve such indemnifying party of any liability to
the indemnified party under this Section 2.8, but the omission so to deliver
written notice to the indemnifying party will not relieve it of any liability
that it may have to any indemnified party otherwise than under this Section 2.8.

          (d)  If Section 2.8 is held by a court of competent jurisdiction to be
unavailable to an indemnified party with respect to any losses, claims, damages
or liabilities referred to herein, the indemnifying party, in lieu of
indemnifying such indemnified party thereunder, shall to the extent permitted by
applicable law contribute to the amount paid or payable by such indemnified
party as a result of such loss, claim, damage or liability in such proportion as
is appropriate to reflect the relative fault of the indemnifying party on the
one hand and of the indemnified party on the other in connection with the
Violation(s) that resulted in such loss, claim, damage or liability, as well as
any other relevant equitable considerations. The relative fault of the
indemnifying party and of the indemnified party shall be determined by a court
of law by reference to, among other things, whether the untrue or alleged untrue
statement of a material fact or the omission to state a material fact relates to
information supplied by the indemnifying party or by the indemnified party and
the parties' relative intent, knowledge, access to information and opportunity
to correct or prevent such statement or omission; provided, that in no event
shall any contribution by a Holder hereunder exceed the net proceeds from the
offering received by such Holder.

          (e)  The obligations of the Company and Holders under this Section 2.8
shall survive completion of any offering of Registrable Securities in a
registration statement and the termination of this agreement. No Indemnifying
Party, in the defense of any such claim or litigation, shall, except with the
consent of each Indemnified Party, consent to entry of any judgment or enter
into any settlement which does not include as an unconditional term thereof the
giving by the claimant or plaintiff to such Indemnified Party of a release from
all liability in respect to such claim or litigation.

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     2.9  Assignment of Registration Rights.  Subject to the restrictions on
          ---------------------------------
transfer set forth in Section 2.1 hereof, the rights of a Holder pursuant to
this Section 2 may be assigned by such Holder to a transferee or assignee of
Registrable Securities which (a) is a general partner, limited partner, retired
partner, member or retired member of a Holder, (b) is a partnership in which a
Holder is a partner, or an associate of such partnership, (c) is a Holder's
family member or trust for the benefit of an individual Holder, or (d) acquires
at least fifty thousand (50,000) shares of Registrable Securities (as adjusted
for stock splits and combinations); and provided further, (i) the transferor
shall, within twenty (20) days after such transfer, furnish to the Company
written notice of the name and address of such transferee or assignee and the
securities with respect to which such registration rights are being assigned and
(ii) such transferee shall agree to be subject to all restrictions set forth in
this Agreement.

     2.10 Amendment of Registration Rights.  Any provision of this Section 2
          --------------------------------
may be amended and the observance thereof may be waived (either generally or in
a particular instance and either retroactively or prospectively), only with the
written consent of the Company and the Holders of at least a majority of the
Registrable Securities then outstanding. Any amendment or waiver effected in
accordance with this Section 2.10 shall be binding upon each Holder and the
Company. By acceptance of any benefits under this Section 2, Holders of
Registrable Securities hereby agree to be bound by the provisions hereof.

     2.11 Subordination of Registration Rights.  The registration rights
          ------------------------------------
granted to Holders hereunder shall be subordinate in nature to the registration
rights granted by the Company to Baxter Healthcare Corporation, a Delaware
corporation ("Baxter"), pursuant to the Investor Rights Agreement dated July 8,
1998, by and among the Company, Baxter, and certain individuals named therein
(the "Investor Rights Agreement"). In accordance with the foregoing, nothing
contained herein shall operate to reduce the number of shares of Company common
stock held by Baxter which pursuant to the Investor Rights Agreement may be
included in a registration statement filed by the Company under the Securities
Act.

Section 3.  Miscellaneous.
            -------------

       3.1  Governing Law.  This Agreement shall be governed by and construed
            -------------
under the laws of the State of California as applied to agreements among
California residents entered into and to be performed entirely within
California.

       3.2  Successors and Assigns.  Except as otherwise expressly provided
            ----------------------
herein, the provisions hereof shall inure to the benefit of, and be binding
upon, the successors, assigns, heirs, executors, and administrators of the
parties hereto and shall inure to the benefit of and be enforceable by each
person who shall be a holder of Registrable Securities from time to time;
provided, however, that prior to the receipt by the Company of adequate written
notice of the transfer of any Registrable Securities specifying the full name
and address of the transferee, the Company may deem and treat the person listed
as the holder of such shares in its records as the absolute owner and holder of
such shares for all purposes, including the payment of dividends or any
redemption price.

       3.3  Entire Agreement.  This Agreement and the Merger Agreement and the
            ----------------
other documents delivered pursuant thereto constitute the full and entire
understanding and agreement

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between the parties with regard to the subjects hereof and no party shall be
liable or bound to any other in any manner by any representations, warranties,
covenants and agreements except as specifically set forth herein and therein.

     3.4  Severability.  In the event one or more of the provisions of this
          ------------
Agreement should, for any reason, be held to be invalid, illegal or
unenforceable in any respect, such invalidity, illegality, or unenforceability
shall not affect any other provisions of this Agreement, and this Agreement
shall be construed as if such invalid, illegal or unenforceable provision had
never been contained herein.

     3.5  Amendment and Waiver.
          --------------------

          (a)  Except as otherwise expressly provided, this Agreement may be
amended or modified only upon the written consent of the Company and the holders
of at least a majority of then outstanding Registrable Securities.

          (b)  Except as otherwise expressly provided, the obligations of the
Company and the rights of the Holders under this Agreement may be waived only
with the written consent of the holders of at least a majority of then
outstanding Registrable Securities.

     3.6  Delays or Omissions.  It is agreed that no delay or omission to
          -------------------
exercise any right, power, or remedy accruing to any Holder, upon any breach,
default or noncompliance of the Company under this Agreement shall impair any
such right, power, or remedy, nor shall it be construed to be a waiver of any
such breach, default or noncompliance, or any acquiescence therein, or of any
similar breach, default or noncompliance thereafter occurring. It is further
agreed that any waiver, permit, consent, or approval of any kind or character on
any Holder's part of any breach, default or noncompliance under the Agreement or
any waiver on such Holder's part of any provisions or conditions of this
Agreement must be in writing and shall be effective only to the extent
specifically set forth in such writing.  All remedies, either under this
Agreement, by law, or otherwise afforded to Holders, shall be cumulative and not
alternative.

     3.7  Notices.  All notices, requests, demands and other communications
          -------
hereunder shall be in writing and shall be deemed to have been duly given when
delivered personally, or when mailed by United States certified or registered
mail, prepaid, to the parties or their assignees at the addresses set forth on
the signature page hereto (or at such other address as shall be given in writing
by any party).

     3.8  Attorneys' Fees.  In the event that any suit or action is instituted
          ---------------
to enforce any provision in this Agreement, the prevailing party in such dispute
shall be entitled to recover from the losing party all fees, costs and expenses
of enforcing any right of such prevailing party under or with respect to this
Agreement, including without limitation, such reasonable fees and expenses of
attorneys and accountants, which shall include, without limitation, all fees,
costs and expenses of appeals.

     3.9  Titles and Subtitles.  The titles of the sections and subsections of
          --------------------
this Agreement are for convenience of reference only and are not to be
considered in construing this Agreement.

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     3.10 Facsimile.  This Agreement may be executed by facsimile (with
          ---------
originals to follow by United States mail), and such facsimile shall be
conclusive evidence of the consent and ratification of the signatory hereto.

IN WITNESS WHEREOF, the undersigned has executed this Registration Rights
Agreement as of the date first written above.

                                   GenStar Therapeutics Corporation

                                   /s/ ROBERT E. SOBOL
                                   -----------------------------------------
                                   By:  Robert E. Sobol, M.D., President

                                          Address:
                                          10835 Altman Row, Suite 150
                                          San Diego, CA 92121

                                       9
<PAGE>

                                   EXHIBIT A

                                    HOLDERS

Wong-Staal Family Trust dtd 9/27/90
Eric Polescha
David Looney
Tina Nova
June and Malcolm Mitchell
Craig Andrews
Shellwater & Co.

                                       1Confidential Treatment Requested for Portions of this Exhibit

                  CONTENT LICENSING AND DISTRIBUTION AGREEMENT

This Content Licensing and Distribution Agreement (this "Agreement") is entered
into as of December 2, 1999 (the "Effective Date") between Golf Rounds.com, Inc.
("Golf Rounds"), a Delaware corporation with offices at 376 Main Street, P.O.
Box 74, Bedminster, New Jersey 07921 Attn: Thomas Van Herwarde, and Ticketmaster
Online - CitySearch, Inc. ("TMCS"), with offices at 790 East Colorado Boulevard,
Suite 200, Pasadena, California 91101 Attn: General Counsel.

1.   License: Golf Rounds shall grant to TMCS a non-exclusive, non-transferable
     (except as otherwise provided in this Agreement), world-wide license to the
     Golf Rounds.com content in order to use, modify, reproduce, distribute,
     display and transmit (defined herein as the "Content") on the TMCS Internet
     web sites featuring the brands of TMCS either alone or together with the
     brands of any third parties, developed in whole or in part by TMCS and
     distributed or made available by TMCS through its web sites for the sole
     purpose of permitting visitors of the TMCS web sites to download, view, and
     print portions of the Content for personal use of the visitors of the TMCS
     web sites (defined herein as the "TMCS Sites").

2.   As used in this Agreement, the Content shall mean the following only:

     a.   The golf courses database;

     b.   Specific information related to individual golf courses, including
          golf photographs, images, text and descriptions;

     c.   Information on golf related news and editorial features, including
          golf photographs, images, text and headlines;

     d.   Once every other week, one new golf course or golf resort will be
          profiled, featuring detailed information, for each TMCS cityguide
          market (defined herein as the "Spotlight"). Each TMCS cityguide
          market's Spotlight shall feature a new golf course or golf resort in
          that market. In selecting the Spotlight, TMCS may request that Golf
          Rounds feature a specific golf course or golf resort by providing Golf
          Rounds with at least thirty (30) days notice of the golf course or
          golf resort to be selected. In no event will TMCS be entitled to
          select more than twenty (20) new golf courses, golf resorts, or TMCS
          cityguide markets as Spotlights within any thirty (30) day period;
          and,

     e.   Other golf related content that the parties mutually agree to include
          on the TMCS Sites during the Term (as defined below) of this
          Agreement.

3.   Golf Rounds Presence on TMCS: The Content shall be featured, in TMCS's sole
     discretion, in an area of the TMCS Sites dedicated to information on golf
     courses, golf resorts, golf tournaments and other golf related information
     ("TMCS Golf Center"). The Content may also be featured, in TMCS's sole
     discretion, in other contextually relevant areas of any TMCS Sites. On
     every "content page" within the TMCS Sites, TMCS shall feature notice below
     the sponsor, if any, but above an article's title or by-line that features
     the Content that states the following: "SOURCE: Golf Rounds.com" (defined
     herein as the "Credit Line"). The size of the Credit Line is subject to
     TMCS' sole discretion, and shall be consistent with other notices or Credit
     Lines provided by TMCS for other content providers. For the purposes of
     this Agreement, a "Content Page" shall mean any web page within the TMCS
     Golf Center that features Golf Rounds' Content and is hosted by TMCS.
     Notwithstanding the foregoing, a Content Page shall not include any web
     page on the TMCS Sites that features only teaser or introductory
     information selected from the Content, with the primary purpose of driving
     users to a Content Page. In addition, TMCS shall have the right, in TMCS's
     sole discretion, to not include Content on the TMCS Sites.

<PAGE>

4.   Delivery of Golf Rounds Content: The Content shall be made available to
     TMCS in a mutually agreeable format beginning no later than ten (10)
     business days following the parties' execution of this Agreement. Moreover,
     Golf Rounds agrees that XML is one acceptable format for the delivery of
     Content hereunder. With the exception of the Spotlight, which shall be
     updated once each week, the Content shall be updated as follows:

     a.   Every twenty-four (24) hours for Content that includes daily golf
          related news and reports (the "Daily News");

     b.   Content that is designated as an extraordinary newsworthy event the
          parties may agree to update such Content more frequently than Daily
          News (the "Breaking News");

     c.   During golf tournaments, the Content shall be updated as often as
          possible to remain current, subject only to technological limitations
          of Golf Rounds, including but not limited to delays beyond Golf
          Rounds' control (the "Tournament News"); and,

     d.   All other Content no less frequently than is offered to any other Golf
          Rounds content distribution partner.

          4.1 Golf Rounds also shall provide TMCS with at least thirty (30) days
     prior written notice of any significant updates, improvements, or
     modifications that generally affect the appearance, updating, delivery or
     other elements of the Content (defined herein as "Enhancements"), and shall
     make such Enhancements available to TMCS at no charge.

5.   Advertising and Sponsorship Revenue: The front page of the TMCS Golf Center
     and each Content Page shall feature at least one advertising banner. In
     addition, TMCS shall use commercially reasonable efforts to sell a
     sponsorship for the TMCS Golf Center (a "Title Sponsorship") and a
     sponsorship for the Content, to the extent that such Content is featured on
     the TMCS Sites (a "Feature Sponsorship"). Notwithstanding the foregoing,
     the parties agree and acknowledge that TMCS shall have the right to sell
     additional advertising banners and/or sponsorships on the TMCS Sites, the
     TMCS Golf Center and the Content Pages without any additional obligation of
     payment due to Golf Rounds. TMCS shall have the sole right to host and sell
     any and all advertising banners, sponsorships, or other devices on the TMCS
     Sites, including the TMCS Golf Center and the Content Pages. The pricing of
     the all advertising and sponsorships shall be subject to TMCS's reasonable
     discretion.

          5.1 TMCS shall pay to Golf Rounds * * * of TMCS's Net Receipts, as
     defined below, from revenue generated from the sale of advertising banners
     and the Title Sponsor on the front page of the TMCS Golf Center, provided
     that the front page of the TMCS Golf Center features a portion of the
     Content.

          5.2 Except for the front page of the TMCS Golf Center, TMCS shall pay
     to Golf Rounds * * * of TMCS's Net Receipts from revenue from the sale of
     advertising banners, Title Sponsorships and Feature Sponsorships on any or
     all Content Pages.

--------

*    Text deleted pursuant to an application for confidential treatment under
     Rule 24b-2 under the Securities Exchange Act of 1934, as amended, and filed
     separately with the Securities and Exchange Commission.

<PAGE>

          5.3 "Net Receipts" shall mean all revenue from the sale advertising
     banners, Title Sponsorships and Feature Sponsorships on the Content Pages
     or the front page of the TMCS Golf Center, as applicable, less any
     commercially reasonable advertising commissions.

          5.4 All barter or other non-cash revenue or exchanges received by TMCS
     for advertising banner or sponsorships on the Content Pages or the front
     page of the TMCS Golf Center shall be included as Net Receipts equal to the
     reasonable commercial value of such advertising or sponsorship for similar
     content on similarly trafficked web pages. Notwithstanding the foregoing,
     no barter or other non-cash revenue will be included in the definition of
     Net Receipts relating to banners, ads or sponsorships run by TMCS on behalf
     of its own properties or those of its affiliates nor will such revenue be
     included in the definition of Net Receipts to the extent that TMCS has open
     (unsold and unallocated inventory) and runs ads on behalf of third parties
     who have not purchased such ads, i.e. freebies. Notwithstanding the
     foregoing, TMCS shall run such "freebies" on the TMCS Golf Center and
     Content Pages only to the same extent and under similar terms as TMCS runs
     such freebies on the other pages of the TMCS Sites.

6.   Payment: All payments from TMCS to Golf Rounds under this Agreement shall
     be payable within thirty (30) days of the end of each month. In addition,
     together with any payment due to Golf Rounds, TMCS shall submit to Golf
     Rounds a written report setting forth in reasonable detail for the previous
     period the amount of advertising or sponsorships on a TMCS Golf Site.

7.   Audit: Not more than once per year during the term of this Agreement, and
     for a period of one (1) years after termination expiration of this
     Agreement, upon reasonable notice, Golf Rounds.com may enter the premises
     of TMCS and perform reasonable audit and inspection procedures to confirm
     that TMCS is in compliance with Section 5 and Section 6 of this Agreement.
     TMCS shall cooperate in any such inquiry by Golf Rounds.com. Golf
     Rounds.com shall have the right to access and make physical and electronic
     copies of physical and electronic information for sole and limited purposes
     of determining TMCS's compliance with Sections 5 and 6 of this Agreement.

8.   Golf Rounds Performance Levels: In addition to making available the Content
     to TMCS Sites, Golf Rounds will provide on-going assistance to TMCS with
     regard to technical, administrative and service-oriented issues relating to
     the utilization, transmission and maintenance of the Content, as TMCS may
     reasonably request. Golf Rounds will use its best efforts to ensure that
     the Content is accurate, comprehensive and updated consistent with the
     terms of this Agreement. Golf Rounds shall provide telephone support and
     electronic mail ("Support") to TMCS no less than twenty-four (24) hours per
     day, seven (7) days per week. TMCS shall have the right to terminate this
     Agreement upon ten (10) business days prior written notice in the event
     that the Content is not available or incomplete at least 99% of any
     calendar month according to the Content availability schedule set forth
     herein, provided that Golf Rounds has been given prompt notice of any
     delays or incomplete Content during such calendar month, and a reasonable
     opportunity to cure is provided to Golf Rounds. Golf Rounds shall notify
     TMCS: (a) at least twenty-four (24) hours prior to any scheduled downtime
     that would prevent or delay the delivery to TMCS of the Content; and (b)
     within twenty-four (24) hours when Golf Rounds is aware of any cause that
     may result in the delivery of unusable or materially incomplete Content.
     Golf Rounds shall also respond to any notification from TMCS that any of
     the Content is unusable or incomplete within twenty-four (24) hours. Golf
     Rounds shall follow up in electronic mail form or telephone to any problem
     reported by TMCS detailing the diagnosis of the problem and the action
     taken to resolve the problem.

9.   Term: The term of the Agreement shall be six (6) months from the date that
     the Golf Rounds Content is first available on a Golf Center Home Page or
     Content Pages to visitors of at least one (1) TMCS Site ("Term"). This
     Agreement shall automatically renew for additional one (1) month terms,
     unless either party notifies the other in writing at least thirty (30) days
     prior to the end of the then current term that it does not wish to renew
     the Agreement.

<PAGE>

10.  Termination: This Agreement may be terminated: (a) By either party upon a
     material breach by the other party of any representation, covenant,
     warranty or term of this Agreement that is not cured within thirty (30)
     days after written notice thereof by the non-breaching party; or (b) by
     either party immediately in the event that (i) the other party files a
     petition for bankruptcy or is adjudicated a bankrupt, (ii) a petition in
     bankruptcy is filed against the other party, (iii) the other party becomes
     insolvent or makes an assignment for the benefit of its creditors or an
     arrangement for its creditors pursuant to any bankruptcy law, (iv) an
     action is instituted by or against the other party seeking its dissolution
     or liquidation of such party's assets or seeking the appointment of a
     trustee, interim trustee, receiver or other custodian for such party's
     property or business and such action is not dismissed within sixty (60)
     days after the date upon which it was instituted; or (v) a receiver is
     appointed for the other party or its business.

11.  Effect of Termination: Upon termination or expiration of this Agreement for
     any reason, TMCS shall discontinue use of the Content on the TMCS Sites
     including any TMCS Golf Site. However, TMCS shall continue to pay, any and
     all amounts owing or owed up to the effective date of termination or
     expiration. Termination of this Agreement shall not act as a waiver of any
     breach of this Agreement or as a release of either party from any liability
     for breach of such party's obligations under this Agreement.

12.  Ownership of Intellectual Property: Each party shall own and retain all
     right, title and interest in and to its own content, domain names,
     hyperlinks, and web sites, including all trademarks, service marks,
     copyrights, patents, trade secrets, and other intellectual property therein
     ("Branding"). Any rights not expressly granted hereunder to the other party
     are reserved for the original party.

13.  Publicity: Except as required by law or regulations such as disclosures for
     the SEC by publicly traded companies, neither party shall make any public
     statement about this Agreement or statement including the name or Branding
     of the other party without the other party's prior written consent, not to
     be unreasonable withheld or delayed.

14.  Copyright Notice: For Content placed on a web page of a TMCS Site, TMCS
     shall identify Golf Rounds or its licensors as the provider of the Content
     and shall incorporate Golf Rounds' and/or its licensors' name and copyright
     designation reasonably requested by reproducing the following notice: (C)
     1999 All rights reserved, Golf Rounds.com, or in the case of a licensor,
     (C) 1999 All rights reserved, LICENSOR's NAME. The location of such notice
     shall be placed in reasonable close proximity with the Content. Golf Rounds
     shall notify TMCS of any third party notice requirements under this
     Agreement at least ten (10) days prior to the third party's content's
     availability on the TMCS Sites.

15.  Representation and Warranties:

          15.1 Each party hereto represents and warrants to the other party
     that: such party is an entity duly organized, validly existing and in good
     standing in the jurisdiction of its formation; such party has full
     authority to enter into this Agreement, to grant the rights granted herein,
     and to perform the obligations assumed hereunder; and that this Agreement,
     when executed by both parties, represents such party's valid and binding
     obligation, enforceable against it in accordance with its terms, subject to
     certain general legal enforceability exceptions. Each party also represents
     and warrants that the grant of rights herein, does not violate the rights
     of any third parties and complies with all applicable Federal, State and
     Local law and regulation.

<PAGE>

          15.2 Each party represents and warrants that their respective web
     sites and the content contains software, hardware and/or source code or
     object code hereunder will: (1) correctly store, calculate, sort,
     manipulate and output multi-century and 21st century dates together with
     20th century dates; and (2) not cause an abnormal abort within such product
     or services or result in the generation of incorrect values or invalid
     outputs involving such dates. Specifically excluded from this
     representation and warranty are third party products and services,
     databases, data, operating systems, hardware, etc. not provided by the
     warranting party.

          15.3 TMCS represents and warrants that it owns, controls, or has
     licensed the necessary right, title, and interest in and to the TMCS Sites
     and Branding, including but not limited to the TMCS Golf Sites and the
     right to license and distribute advertising banners, sponsorships, and
     other devices on the web pages as provided for under this Agreement. In
     addition, TMCS represents and warrants that it has the authority to enter
     into this Agreement and to fully perform all of its obligations hereunder.

          15.4 Golf Rounds represents and warrants that it owns, controls, or
     has licensed the necessary right, title and interest in and to any and all
     of the Content, Branding and materials provided to TMCS hereunder,
     including the right to license and distribute the news, images and
     editorial information and the name and related information of each of the
     golf courses as provided for under this Agreement. In addition, Golf Rounds
     represents and warrants that it has the authority to enter into this
     Agreement and to fully perform all of its obligations hereunder.

          15.5 Golf Rounds represents and warrants that all golf courses, golf
     information, rates, tee times and availability will be offered to TMCS
     users to the same or greater extent as offered to Golf Rounds most favored
     business partners or are offered directly by Golf Rounds itself.

          15.6 Golf Rounds represents and warrants that any Content delivered to
     TMCS during the Term of this Agreement shall not contain any content that:

          o    Is patently offensive to the online community, such as content
               that promotes racism, bigotry , hatred or physical harm of any
               kind against any group or individual;

          o    Harasses or advocates harassment of another person;

          o    Promotes information that you know is false, misleading or
               promotes illegal activities or conduct which is abusive,
               threatening, obscene, defamatory or libelous;

          o    Is or promotes an illegal or unauthorized copy of another person
               or entity's copyrighted work, without authorization by the
               copyright owner;

          o    Displays pornographic or sexually explicit material of any kind;

          o    Provides material that exploits people under the age of 18 in a
               sexual or violent manner, or solicits personal information from
               anyone under 18;

          o    Provides instructional information about illegal activities such
               as making or buying illegal weapons; violating someone's privacy;
               or providing or creating computer viruses; and

          o    Contains any computer viruses of any kind.

16.      LIMITATIONS.

          16.1 Limited Warranties. OTHER THAN AS EXPRESSLY STATED IN THIS
     AGREEMENT, GOLF ROUNDS AND TMCS MAKE NO WARRANTIES, EXPRESS OR IMPLIED,
     WITH RESPECT TO THEIR SERVICES AND SITES, AND THE PARTIES SPECIFICALLY
     DISCLAIM ALL OTHER WARRANTIES OR CONDITIONS REGARDING THEIR SERVICES AND
     SITES, INCLUDING ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
     PARTICULAR PURPOSE OR NONINFRINGEMENT.

<PAGE>

          16.2 Limitation of Liability. IN NO EVENT SHALL EITHER PARTY BE LIABLE
     TO THE OTHER OR ANY THIRD PARTY, WHETHER IN CONTRACT, TORT (INCLUDING
     NEGLIGENCE) OR OTHERWISE, FOR ANY SPECIAL, CONSEQUENTIAL, INCIDENTAL, OR
     INDIRECT DAMAGES, (INCLUDING, BUT NOT LIMITED TO, LOST PROFIT OR BUSINESS
     INTERRUPTION EVEN IF NOTIFIED IN ADVANCE OF SUCH POSSIBILITY), HOWEVER
     CAUSED AND ON ANY THEORY OF LIABILITY, ARISING OUT OF THIS AGREEMENT,
     WHETHER OR NOT SUCH PARTY IS ADVISED OF THE POSSIBILITY OF SUCH DAMAGES,
     AND NOTWITHSTANDING ANY FAILURE OF ESSENTIAL PURPOSE OF ANY LIMITED REMEDY.
     NOTWITHSTANDING THE FOREGOING, THIS SECTION IS NOT INTENDED TO LIMIT AND
     DOES NOT LIMIT THE PARTIES' OBLIGATIONS REGARDING CONFIDENTIALITY, BREACH
     OR VIOLATION OF THE OTHER PARTY'S INTELLECTUAL PROPERTY RIGHTS AND ANY
     SECTIONS REGARDING INDEMNITY IN THIS AGREEMENT.

17.      Indemnification:

          17. 1 Indemnification by TMCS. TMCS will defend, indemnify and hold
     harmless Golf Rounds, its successors, assigns, parent, subsidiaries,
     affiliates, and their respective officers, directors, agents and employees,
     from and against any action, suit or claim (including reasonable attorneys'
     fees) arising out of or in any way connected with (a) any claim that the
     TMCS Branding or content at TMCS Sites, including advertising banners,
     sponsorships, or other devices on such web pages, infringes any
     intellectual property rights or other rights of any third party, or (b) any
     breach by TMCS of the covenants, warranties, representations or agreements
     of this Agreement. Golf Rounds will give TMCS prompt notice of any such
     claim or threatened claim.

          17.2 Indemnification by Golf Rounds. Golf Rounds will defend,
     indemnify and hold harmless TMCS, its successors, assigns, parent,
     subsidiaries, affiliates, and their respective officers, directors, agents
     and employees, from and against any action, suit or claim (including
     reasonable attorneys' fees) arising out of or in any way connected with (a)
     any claim that the Branding or Content, or legal notices required by any
     third party licensor of a portion of the Content, provided to TMCS by Golf
     Rounds, infringes any intellectual property rights or other rights of any
     third party, or (b) any breach by Golf Rounds of the covenants, warranties,
     representations or agreements of this Agreement. TMCS will give Golf Rounds
     prompt notice of any such claim or threatened claim.

          17.3 Procedure. The indemnified party will: (a) promptly notify the
     indemnifying party of any claim, suit or proceeding for which defense or
     indemnity is claimed; (b) cooperate reasonably with the indemnifying party
     at the latter's expense; and (c) allow the indemnifying party to control
     the defense or settlement thereof; provided, however, that the indemnifying
     party may not consent to entry of any judgment or enter into any settlement
     without the prior written consent of the indemnified party (which consent
     shall not be unreasonably withheld or delayed), unless such judgment or
     settlement provides solely for money damages or other money payments which
     the indemnifying party actually pays on behalf of the indemnified party and
     includes as an unconditional term thereof a release of the indemnified
     party from all liability in respect of the claim, suit or proceeding giving
     rise to the claim for indemnification. The indemnified party will have the
     right to participate in any defense of a claim and/or to be represented by
     counsel of its own choosing at its own expense.

<PAGE>

18.      General Terms:

          18.1 Governing Law. This Agreement shall be governed by and construed
     under the laws of the State of California, without regard to conflict of
     laws. In any action or proceeding to enforce rights under this Agreement,
     the prevailing party shall be entitled to recover reasonable costs and
     attorneys' fees.

          18.2 Survival. Provisions of this Agreement that by reasonable
     construction should survive the expiration or termination of this Agreement
     shall so survive.

          18.3 Assignment. Either party shall have the right to transfer this
     Agreement, and assign all of its rights and delegate all of its obligations
     hereunder, to any affiliate of such party, and to any successor by way of
     merger or consolidation or in connection with the sale or transfer of
     substantially all of its business and assets relating to this Agreement,
     unless the merger, acquisition or sale is to a party whose business
     interests are in conflict with those of the other party. Except as
     otherwise expressly provided in this Agreement, neither party may transfer
     or assign its rights or delegate its obligations hereunder (whether
     voluntarily or by operation of law) without the prior written consent of
     the other party, which consent shall not be withheld or delayed
     unreasonably.

          18.4 Notices. All notices under this Agreement shall be in writing and
     delivered personally or by e-mail, facsimile, commercial overnight courier,
     or certified or registered mail, return receipt requested, to a party at
     its respective address set forth herein.

          18.5 Entire Agreement. This Agreement sets forth the entire agreement
     and understanding of the parties relating to the subject matter herein and
     merges and supersedes all prior discussions between them.

          18.6 Severability. If the application of any provision or provisions
     of this Agreement to any particular facts or circumstances shall be held to
     be invalid or unenforceable by any court of competent jurisdiction, then:
     (i) the validity and enforceability of such provision or provisions as
     applied to any other particular facts or circumstances and the validity of
     other provisions of this Agreement shall not in any way be affected or
     impaired thereby; and (ii) such provision or provisions shall be reformed
     without further action by the parties hereto and only to the extent
     necessary to make such provision or provisions valid and enforceable when
     applied to such particular facts and circumstances.

          18.7 Independent Contractors. The parties are independent contractors,
     and nothing in this Agreement shall be construed to create a joint venture
     or partnership.

          18.8 Force Majeure. A party will not be deemed to have materially
     breached this Agreement to the extent that performance of its obligations
     or attempts to cure any breach are delayed or prevented by reason of an act
     of God, fire, natural disaster, accident, act of government, or shortage of
     equipment, materials or supplies beyond the reasonable control of such
     party (a "Force Majeure Event"); provided that the party whose performance
     is delayed or prevented promptly notifies the other party of the nature and
     duration of the Force Majeure Event.

<PAGE>

IN WITNESS WHEREOF, the parties have caused this Agreement to be executed as of
the Effective Date by the undersigned duly authorized.

Ticketmaster Online - CitySearch, Inc.      Golf Rounds.com, Inc.

By:      /s/ Brad Serwin                    By: /s/ Thomas K. Van Herwarde
         ----------------------------       -------------------------------

Name:    Brad Serwin                        Name:   Thomas K. Van Herwarde
         ----------------------------       -------------------------------

Title:   Vice President                     Title:   President
         ----------------------------       -------------------------------

Date:    12/2/99                                     Date:    12/02/99
         ----------------------------       -------------------------------

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