Document:

<PAGE>

                                                                   EXHIBIT 10.18

                                                                   July 30, 1999

Mr. Martin Yudkovitz
President
National Multimedia Inc.
30 Rockefeller Plaza
New York, New York 10112

               Re: Replay Zones /Advertising
                   -------------------------

Dear Marty:

Replay is pleased to have National Broadcasting Company, Inc. ("NBC") join its
group of investors in its Series E financing.  NBC will invest $5 million
dollars under the terms of the Series E financing. Additionally, this letter
agreement (the "Agreement") shall embody the agreement between Replay and NBC on
the following issues:

1)   The term of this Agreement shall commence on the date hereof and end on
     [***] (the "Term"); provided, that if in NBC's good faith judgment Replay
     fails to comply with Section 2 hereof, then NBC shall have the option to
     extend the Term for a period of [***] by providing written notice to
     Replay.

2)   Replay will use its best efforts to address concerns related to how the use
     of the [***] on the Replay remote affects advertising. Specifically,
     within the [***] period after the date hereof Replay will consult with its
     investors and advertisers to determine the best course of action to
     encourage both advertiser and viewer support for the category of
     personalized television and shall use its best efforts to take such action
     in connection with the Replay service (the "Replay Network Service").
     During this review process, Replay will no longer [***] the [***]
     functionality in advertisements or marketing materials, including without
     limitation in brochures, press releases and on the ReplayTV website.

3)   Replay will provide to NBC [***] Replay Zone [***] during the Term. NBC
     shall receive additional Replay Zones at a cost that is equal to the [***]
     of (a) [***] of the Replay ratecard rate for the sponsorship of a Replay
     Zone, and (b) [***] charged to [***]. "Replay Zone" means an area which may
     be directly linked to from the Replay Zone Guide which features programming
     designated by the applicable NBC television network (each, an "NBC
     Network"); provided, that Replay shall work in conjunction with

CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY WITH
THE SECURITIES AND EXCHANGE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS.

[***] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE SECURITIES AND EXCHANGE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS.

<PAGE>

     NBC creative services to produce each NBC Replay Zone, including special
     programming packages highlighting current programming and upcoming events.

4)   Replay shall promptly develop the Replay Zone Guide in which NBC may
     promote its Replay Zones. Replay shall provide NBC with [***] positioning
     [***] for [***] during the Term. The Replay Zone Guide shall be the primary
     area devoted to displaying Replay's programming partners, and shall be
     directly linked to the main screen of the Replay Network Service.

5)   In regard to lead-in advertisements, lead-out advertisements and insertion
     advertisements surrounding programming that is time shifted from any NBC
     Network will be sold by Replay; provided, that NBC shall have [***] right
     [***] all advertising sold by Replay, which [***] shall be [***] in good
     faith consistent with NBC's [***] concerning advertisements or promotional
     messages to be aired on NBC, also taking into account existing
     sponsorships, category or programming [***] or similar arrangements that
     each NBC Network may have with certain of its advertisers. This restriction
     will remain in place during the Term. Notwithstanding the foregoing, Replay
     shall not swap out, replace or otherwise alter any advertisements included
     within any NBC Network programs, whether such programs are viewed on a
     real-time or time-shifted basis, without the prior written consent of NBC.

6)   NBC will have the right to appoint one individual who shall serve as an
     observer on Replay's Board of Directors subject to the limitations and
     obligations set forth in the attached Observer Policy letter.

7)   Other terms consistent with terms granted to other major media investors in
     the Series E financing will be negotiated in good faith between Replay and
     NBC. Replay agrees to disclose to NBC the material terms granted to other
     major media investors in the Series E financing to the extent it has the
     right to do so.

8)   The Replay Network Service will not intentionally delete any programming or
     data within the signals that are transmitted by any NBC Network provided
     that this material does not interfere with the Replay Network Service.

9)   The Replay Network Service is intended to provide Internet connectivity as
     soon as it is technology and commercially reasonable to do so. At such
     time, (a) Replay will ensure that any links and/or web content incorporated
     within or otherwise accompanying the signal of each NBC Network will be
     passed through to users of the Replay Network Service provided that this
     material does not interfere with the Replay Network Service and it is
     technology and commercially feasible to do so, and (b) Replay shall
     negotiate in good faith with NBC with respect to placement for the Internet
     assets of NBC and its affiliates.

[***] = CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY
WITH THE SECURITIES AND EXCHANGE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS.

<PAGE>

10)  Replay shall not modify, alter or re-design the Replay Network Service in a
     manner which shall have a material adverse impact on the rights granted to
     NBC herein.

     If this Agreement is acceptable to you, I would appreciate your indicating
your acceptance of this Agreement by executing this letter at the place
indicated below.

                                     Sincerely,

                                     REPLAY NETWORKS, INC.

                                     By: /s/ Layne Britton
                                         --------------------------------------
                                     Layne Britton
                                     Executive Vice President, Network Services
                                     Replay Networks, Inc.

Agreed and consented to:

NATIONAL BROADCASTING
COMPANY, INC.

By: /s/ Martin Yudkovitz                Date:  July 30,1999
    -----------------------
    Name:  Martin Yudkovitz
    Title: President, NBC MultiMedia, Inc.<PAGE>

                                                                   EXHIBIT 10.20

                          PACIFIC DIGITAL MEDIA, INC.

                        COMMON STOCK PURCHASE AGREEMENT
                        -------------------------------

     This Common Stock Purchase Agreement (the "Agreement") is made as of
                                                ---------
September 15, 1997 by and between Pacific Digital Media, Inc., a California
corporation (the "Company"), and Anthony J. Wood ("Purchaser").
                  -------                          ---------

     1.  Sale of Stock.  Subject to the terms and conditions of this Agreement,
         -------------
on the Purchase Date (as defined below) the Company will issue and sell to
Purchaser, and Purchaser agrees to purchase from the Company, 3,000,000 shares
of the Company's Common Stock (the "Shares") at a purchase price of $0.001 per
                                    ------
Share for a total purchase price of $3,000.00.  The term "Shares" refers to the
                                                          ------
purchased Shares and all securities received in replacement of or in connection
with the Shares pursuant to stock dividends or splits, all securities received
in replacement of the Shares in a recapitalization, merger, reorganization,
exchange or the like, and all new, substituted or additional securities or other
properties to which Purchaser is entitled by reason of Purchaser's ownership of
the Shares.

     2.  Purchase.  The purchase and sale of the Shares under this Agreement
         --------
shall occur at the principal office of the Company simultaneously with the
execution of this Agreement or at such other time and place as the Company and
Purchaser shall agree (the "Purchase Date").  On the Purchase Date, the Company
                            -------------
will deliver to Purchaser a certificate representing the Shares to be purchased
by Purchaser (which shall be issued in Purchaser's name) against payment of the
purchase price therefor by Purchaser by (a) check made payable to the Company,
(b) cancellation of indebtedness of the Company to Purchaser, or (c) by a
combination of the foregoing.

     3.  Limitations on Transfer.  In addition to any other limitation on
         -----------------------
transfer created by applicable securities laws, Purchaser shall not assign,
encumber or dispose of any interest in the Shares while the Shares are subject
to the Company's Repurchase Option (as defined below), except as provided below.
After any Shares have been released from the Repurchase Option, Purchaser shall
not assign, encumber or dispose of any interest in such Shares except in
compliance with the provisions below and applicable securities laws.

          (a)  Repurchase Option.
               -----------------

          (i)  In the event of the voluntary or involuntary termination of
Purchaser's employment or consulting relationship with the Company for any
reason (including death or disability), with or without cause, the Company shall
upon the date of such termination (the "Termination Date") have an irrevocable,
                                        ----------------
exclusive option (the "Repurchase Option") for a period of sixty (60) days from
                       -----------------
such date to repurchase all or any portion of the Shares held by Purchaser as of
the Termination Date which have not yet been released from the Company's
Repurchase Option at the original purchase price per Share specified in Section
1 (adjusted for any stock splits, stock dividends and the like); provided,
                                                                 --------
however, that the Repurchase Option shall continue for a period of up to one
-------
year from the Termination Date to the extent that the Company reasonably
determines that such an extension of time is necessary to prevent the
<PAGE>

repurchase of Purchaser's Shares from causing other capital stock of the Company
to not qualify as "small business stock" under Section 1202 of the Internal
Revenue Code of 1986, as amended.

                (ii)  The Repurchase Option shall be exercised by the Company by
written notice to Purchaser or Purchaser's executor and, at the Company's
option, (A) by delivery to Purchaser or Purchaser's executor with such notice of
a check in the amount of the purchase price for the Shares being purchased, or
(B) in the event Purchaser is indebted to the Company, by cancellation by the
Company of an amount of such indebtedness equal to the purchase price for the
Shares being repurchased, or (C) by a combination of (A) and (B) so that the
combined payment and cancellation of indebtedness equals such purchase price.
Upon delivery of such notice and payment of the purchase price in any of the
ways described above, the Company shall become the legal and beneficial owner of
the Shares being repurchased and all rights and interest therein or related
thereto, and the Company shall have the right to transfer to its own name the
number of Shares being repurchased by the Company, without further action by
Purchaser.

                (iii) One hundred percent (100%) of the Shares shall initially
be subject to the Repurchase Option. 1/36th of the Shares shall be released from
the Repurchase Option at the end of each month following the Vesting
Commencement Date (as set forth on the signature page of this Agreement), until
all Shares are released from the Repurchase Option (provided in each case that
Purchaser's employment or consulting relationship with the Company has not been
terminated prior to the date of any such release).  Fractional shares shall be
rounded to the nearest whole share.

          (b)   Right of First Refusal.  Before any Shares held by Purchaser or
                ----------------------
any transferee of Purchaser (either being sometimes referred to herein as the
"Holder") may be sold or otherwise transferred (including transfer by gift or
 ------
operation of law), the Company or its assignee(s) shall have a right of first
refusal to purchase the Shares on the terms and conditions set forth in this
Section 3(b) (the "Right of First Refusal").
                   ----------------------

                (i)   Notice of Proposed Transfer. The Holder of the Shares
                      ---------------------------
shall deliver to the Company a written notice (the "Notice") stating: (A) the
                                                    ------
Holder's bona fide intention to sell or otherwise transfer such Shares; (B) the
name of each proposed purchaser or other transferee ("Proposed Transferee"); (C)
                                                      -------------------
the number of Shares to be transferred to each Proposed Transferee; and (D) the
terms and conditions of each proposed sale or transfer.  The Holder shall offer
the Shares at the same price (the "Offered Price") and upon the same terms (or
                                   -------------
terms as similar as reasonably possible) to the Company or its assignee(s).

                (ii)  Exercise of Right of First Refusal. At any time within
                      ----------------------------------
thirty (30) days after receipt of the Notice, the Company and/or its assignee(s)
may, by giving written notice to the Holder, elect to purchase all, but not less
than all, of the Shares proposed to be transferred to any one or more of the
Proposed Transferees, at the purchase price determined in accordance with
subsection (iii) below.

                (iii) Purchase Price. The purchase price ("Purchase Price") for
                      --------------                       --------------
the Shares purchased by the Company or its assignee(s) under this Section 3(b)
shall be the Offered

                                                                             -2-
<PAGE>

Price. If the Offered Price includes consideration other than cash, the cash
equivalent value of the non-cash consideration shall be determined by the Board
of Directors of the Company in good faith.

                (iv) Payment.  Payment of the Purchase Price shall be made, at
                     -------
the option of the Company or its assignee(s), in cash (by check), by
cancellation of all or a portion of any outstanding indebtedness of the Holder
to the Company (or, in the case of repurchase by an assignee, to the assignee),
or by any combination thereof within thirty (30) days after receipt of the
Notice or in the manner and at the times set forth in the Notice.

               (v)  Holder's Right to Transfer.  If all of the Shares proposed
                    --------------------------
in the Notice to be transferred to a given Proposed Transferee are not purchased
by the Company and/or its assignee(s) as provided in this Section 3(b), then the
Holder may sell or otherwise transfer such Shares to that Proposed Transferee at
the Offered Price or at a higher price, provided that such sale or other
transfer is consummated within sixty (60) days after the date of the Notice and
provided further that any such sale or other transfer is effected in accordance
with any applicable securities laws and the Proposed Transferee agrees in
writing that the provisions of this Section 3 shall continue to apply to the
Shares in the hands of such Proposed Transferee. If the Shares described in the
Notice are not transferred to the Proposed Transferee within such period, or if
the Holder proposes to change the price or other terms to make them more
favorable to the Proposed Transferee, a new Notice shall be given to the
Company, and the Company and/or its assignees shall again be offered the Right
of First Refusal before any Shares held by the Holder may be sold or otherwise
transferred.

               (vi) Exception for Certain Family Transfers.  Anything to the
                    --------------------------------------
contrary contained in this Section 3(b) notwithstanding, the transfer of any or
all of the Shares during Purchaser's lifetime or on Purchaser's death by will or
intestacy to Purchaser's Immediate Family or a trust for the benefit of
Purchaser's Immediate Family shall be exempt from the provisions of this Section
3(b). "Immediate Family" as used herein shall mean spouse, lineal descendant or
       ----------------
antecedent, father, mother, brother or sister. In such case, the transferee or
other recipient shall receive and hold the Shares so transferred subject to the
provisions of this Section 3, and there shall be no further transfer of such
Shares except in accordance with the terms of this Section 3.

          (c)  Involuntary Transfer.
               --------------------

               (i)  Company's Right to Purchase upon Involuntary Transfer.  In
                    -----------------------------------------------------
the event, at any time after the date of this Agreement, of any transfer by
operation of law or other involuntary transfer (including death or divorce, but
excluding a transfer to Immediate Family as set forth in Section 3(b)(vi) above)
of all or a portion of the Shares by the record holder thereof, the Company
shall have an option to purchase all of the Shares transferred at the greater of
the purchase price paid by Purchaser pursuant to this Agreement or the fair
market value of the Shares on the date of transfer. Upon such a transfer, the
person acquiring the Shares shall promptly notify the Secretary of the Company
of such transfer. The right to purchase such

                                                                             -3-
<PAGE>

Shares shall be provided to the Company for a period of thirty (30) days
following receipt by the Company of written notice by the person acquiring the
Shares.

               (ii) Price for Involuntary Transfer.  With respect to any stock
                    ------------------------------
to be transferred pursuant to Section 3(c)(i), the price per Share shall be a
price set by the Board of Directors of the Company that will reflect the current
value of the stock in terms of present earnings and future prospects of the
Company. The Company shall notify Purchaser or his or her executor of the price
so determined within thirty (30) days after receipt by it of written notice of
the transfer or proposed transfer of Shares. However, if the Purchaser does not
agree with the valuation as determined by the Board of Directors of the Company,
the Purchaser shall be entitled to have the valuation determined by an
independent appraiser to be mutually agreed upon by the Company and the
Purchaser and whose fees shall be borne equally by the Company and the
Purchaser.

           (d) Assignment.  The right of the Company to purchase any part of the
               ----------
Shares may be assigned in whole or in part to any shareholder or shareholders of
the Company or other persons or organizations; provided, however, that an
assignee, other than a corporation that is the parent or a 100% owned subsidiary
of the Company, must pay the Company, upon assignment of such right, cash equal
to the difference between the original purchase price and fair market value, if
the original purchase price is less than the fair market value of the Shares
subject to the assignment.

           (e) Restrictions Binding on Transferees.  All transferees of Shares
               -----------------------------------
or any interest therein will receive and hold such Shares or interest subject to
the provisions of this Agreement, including, insofar as applicable, the
Repurchase Option. Any sale or transfer of the Company's Shares shall be void
unless the provisions of this Agreement are met.

           (f) Termination of Rights.  The right of first refusal granted the
               ---------------------
Company by Section 3(b) above and the option to repurchase the Shares in the
event of an involuntary transfer granted the Company by Section 3(c) above shall
terminate upon the first sale of Common Stock of the Company to the general
public pursuant to a registration statement filed with and declared effective by
the Securities and Exchange Commission under the Securities Act of 1933, as
amended (the "Securities Act").  Upon termination of the right of first refusal
              --------------
described in Section 3(b) and the expiration or exercise of the Repurchase
Option, a new certificate or certificates representing the Shares not
repurchased shall be issued, on request, without the legend referred to in
Section 6(a)(ii) below and delivered to Purchaser.

       4.  Escrow of Unvested Shares.  For purposes of facilitating the
           -------------------------
enforcement of the provisions of Section 3 above, Purchaser agrees, immediately
upon receipt of the certificate(s) for the Shares subject to the Repurchase
Option, to deliver such certificate(s), together with an Assignment Separate
from Certificate in the form attached to this Agreement as Exhibit A executed by
                                                           ---------
Purchaser and by Purchaser's spouse (if required for transfer), in blank, to the
Secretary of the Company, or the Secretary's designee, to hold such
certificate(s) and Assignment Separate from Certificate in escrow and to take
all such actions and to effectuate all such transfers and/or releases as are in
accordance with the terms of this Agreement.  Purchaser

                                                                             -4-
<PAGE>

hereby acknowledges that the Secretary of the Company, or the Secretary's
designee, is so appointed as the escrow holder with the foregoing authorities as
a material inducement to make this Agreement and that said appointment is
coupled with an interest and is accordingly irrevocable. Purchaser agrees that
said escrow holder shall not be liable to any party hereof (or to any other
party). The escrow holder may rely upon any letter, notice or other document
executed by any signature purported to be genuine and may resign at any time.
Purchaser agrees that if the Secretary of the Company, or the Secretary's
designee, resigns as escrow holder for any or no reason, the Board of Directors
of the Company shall have the power to appoint a successor to serve as escrow
holder pursuant to the terms of this Agreement.

       5.  Investment and Taxation Representations.  In connection with the
           ---------------------------------------
purchase of the Shares, Purchaser represents to the Company the following:

           (a) Purchaser is aware of the Company's business affairs and
financial condition and has acquired sufficient information about the Company to
reach an informed and knowledgeable decision to acquire the Shares. Purchaser is
purchasing the Shares for investment for his or her own account only and not
with a view to, or for resale in connection with, any "distribution" thereof
within the meaning of the Securities Act.

           (b) Purchaser understands that the Shares have not been registered
under the Securities Act by reason of a specific exemption therefrom, which
exemption depends upon, among other things, the bona fide nature of Purchaser's
investment intent as expressed herein.

           (c) Purchaser understands that the Shares are "restricted securities"
under applicable U.S. federal and state securities laws and that, pursuant to
these laws, Purchaser must hold the Shares indefinitely unless they are
registered with the Securities and Exchange Commission and qualified by state
authorities, or an exemption from such registration and qualification
requirements is available.  Purchaser acknowledges that the Company has no
obligation to register or qualify the Shares for resale.  Purchaser further
acknowledges that if an exemption from registration or qualification is
available, it may be conditioned on various requirements including, but not
limited to, the time and manner of sale, the holding period for the Shares and
requirements relating to the Company which are outside of the Purchaser's
control, and which the Company is under no obligation and may not be able to
satisfy.

           (d) Purchaser understands that Purchaser may suffer adverse tax
consequences as a result of Purchaser's purchase or disposition of the Shares.
Purchaser represents that Purchaser has consulted any tax consultants Purchaser
deems advisable in connection the purchase or disposition of the Shares and that
Purchaser is not relying on the Company for any tax advice.

       6.  Restrictive Legends and Stop-Transfer Orders.
           --------------------------------------------

           (a) Legends.  The certificate or certificates representing the Shares
               -------
shall bear the following legends (as well as any legends required by applicable
state and federal corporate and securities laws):

                                                                             -5-
<PAGE>

               (i)   THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
                     REGISTERED UNDER THE SECURITIES ACT OF 1933, AND HAVE BEEN
                     ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN
                     CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH
                     SALE OR DISPOSITION MAY BE EFFECTED WITHOUT AN EFFECTIVE
                     REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF
                     COUNSEL IN A FORM SATISFACTORY TO THE COMPANY THAT SUCH
                     REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF
                     1933.

               (ii)  THE SHARES REPRESENTED BY THIS CERTIFICATE MAY BE
                     TRANSFERRED ONLY IN ACCORDANCE WITH THE TERMS OF AN
                     AGREEMENT BETWEEN THE COMPANY AND THE SHAREHOLDER, A COPY
                     OF WHICH IS ON FILE WITH THE SECRETARY OF THE COMPANY.

               (iii) Any legend required to be placed thereon by the California
                     Commissioner of Corporations.

           (b) Stop-Transfer Notices.  Purchaser agrees that, in order to ensure
               ---------------------
compliance with the restrictions referred to herein, the Company may issue
appropriate "stop transfer" instructions to its transfer agent, if any, and
that, if the Company transfers its own securities, it may make appropriate
notations to the same effect in its own records.

           (c) Refusal to Transfer.  The Company shall not be required (i) to
               -------------------
transfer on its books any Shares that have been sold or otherwise transferred in
violation of any of the provisions of this Agreement or (ii) to treat as owner
of such Shares or to accord the right to vote or pay dividends to any purchaser
or other transferee to whom such Shares shall have been so transferred.

       7.  No Employment Rights.  Nothing in this Agreement shall affect in any
           --------------------
manner whatsoever the right or power of the Company, or a parent or subsidiary
of the Company, to terminate Purchaser's employment, for any reason, with or
without cause.

       8.  Section 83(b) Election.  Purchaser understands that Section 83(a) of
           ----------------------
the Internal Revenue Code of 1986, as amended (the "Code"), taxes as ordinary
                                                    ----
income the difference between the amount paid for the Shares and the fair market
value of the Shares as of the date any restrictions on the Shares lapse.  In
this context, "restriction" means the right of the Company to buy back the
               -----------
Shares pursuant to the Repurchase Option set forth in Section 3(a) of this
Agreement.  Purchaser understands that Purchaser may elect to be taxed at the
time the Shares are purchased, rather than when and as the Repurchase Option
expires, by filing an election under Section 83(b) (an "83(b) Election") of the
                                                        --------------
Code with the Internal Revenue Service within

                                                                             -6-
<PAGE>

thirty (30) days from the date of purchase. Even if the fair market value of the
Shares at the time of the execution of this Agreement equals the amount paid for
the Shares, the election must be made to avoid income under Section 83(a) in the
future. Purchaser understands that failure to file such an election in a timely
manner may result in adverse tax consequences for Purchaser. Purchaser further
understands that an additional copy of such election form should be filed with
his or her federal income tax return for the calendar year in which the date of
this Agreement falls. Purchaser acknowledges that the foregoing is only a
summary of the effect of United States federal income taxation with respect to
purchase of the Shares hereunder, and does not purport to be complete. Purchaser
further acknowledges that the Company has directed Purchaser to seek independent
advice regarding the applicable provisions of the Code, the income tax laws of
any municipality, state or foreign country in which Purchaser may reside, and
the tax consequences of Purchaser's death.

          Purchaser agrees that he or she will execute and deliver to the
Company with this executed Agreement a copy of the Acknowledgment and Statement
of Decision Regarding Section 83(b) Election (the "Acknowledgment"), attached
                                                   --------------
hereto as Exhibit B.  Purchaser further agrees that Purchaser will execute and
          ---------
submit with the Acknowledgment a copy of the 83(b) Election, attached hereto as
Exhibit C, if Purchaser has indicated in the Acknowledgment his or her decision
---------
to make such an election.

      9.  Market Standoff Agreement.  In connection with the initial public
          -------------------------
offering of the Company's securities and upon request of the Company or the
underwriters managing any underwritten offering of the Company's securities,
Purchaser agrees not to sell, make any short sale of, loan, grant any option for
the purchase of, or otherwise dispose of any Shares (other than those included
in the registration) without the prior written consent of the Company or such
underwriters, as the case may be, for such period of time (not to exceed 180
days) from the effective date of such registration as may be requested by the
Company or such managing underwriters and to execute an agreement reflecting the
foregoing as may be requested by the underwriters at the time of the public
offering.

     10.  Miscellaneous.
          -------------

          (a) Governing Law.  This Agreement and all acts and transactions
              -------------
pursuant hereto and the rights and obligations of the parties hereto shall be
governed, construed and interpreted in accordance with the laws of the State of
California, without giving effect to principles of conflicts of law.

          (b) Entire Agreement; Enforcement of Rights.  This Agreement sets
              ---------------------------------------
forth the entire agreement and understanding of the parties relating to the
subject matter herein and merges all prior discussions between them.  No
modification of or amendment to this Agreement, nor any waiver of any rights
under this Agreement, shall be effective unless in writing signed by the parties
to this Agreement.  The failure by either party to enforce any rights under this
Agreement shall not be construed as a waiver of any rights of such party.

          (c) Severability.  If one or more provisions of this Agreement are
              ------------
held to be unenforceable under applicable law, the parties agree to renegotiate
such provision in good faith.

                                                                             -7-
<PAGE>

In the event that the parties cannot reach a mutually agreeable and enforceable
replacement for such provision, then (i) such provision shall be excluded from
this Agreement, (ii) the balance of this Agreement shall be interpreted as if
such provision were so excluded and (iii) the balance of this Agreement shall be
enforceable in accordance with its terms.

          (d) Construction.  This Agreement is the result of negotiations
              ------------
between and has been reviewed by each of the parties hereto and their respective
counsel, if any; accordingly, this Agreement shall be deemed to be the product
of all of the parties hereto, and no ambiguity shall be construed in favor of or
against any one of the parties hereto.

          (e) Notices.  Any notice required or permitted by this Agreement shall
              -------
be in writing and shall be deemed sufficient when delivered personally or sent
by telegram or fax or forty-eight (48) hours after being deposited in the U.S.
mail, as certified or registered mail, with postage prepaid, and addressed to
the party to be notified at such party's address as set forth below or as
subsequently modified by written notice.

          (f) Counterparts.  This Agreement may be executed in two or more
              ------------
counterparts, each of which shall be deemed an original and all of which
together shall constitute one instrument.

          (g) Successors and Assigns.  The rights and benefits of this Agreement
              ----------------------
shall inure to the benefit of, and be enforceable by the Company's successors
and assigns.  The rights and obligations of Purchaser under this Agreement may
only be assigned with the prior written consent of the Company.

          (h) California Corporate Securities Law.  THE SALE OF THE SECURITIES
              -----------------------------------
WHICH ARE THE SUBJECT OF THIS AGREEMENT HAS NOT BEEN QUALIFIED WITH THE
COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA AND THE ISSUANCE OF THE
SECURITIES OR THE PAYMENT OR RECEIPT OF ANY PART OF THE CONSIDERATION THEREFOR
PRIOR TO THE QUALIFICATION IS UNLAWFUL, UNLESS THE SALE OF SECURITIES IS EXEMPT
FROM QUALIFICATION BY SECTION 25100, 25102 OR 25105 OF THE CALIFORNIA
CORPORATIONS CODE.  THE RIGHTS OF ALL PARTIES TO THIS AGREEMENT ARE EXPRESSLY
CONDITIONED UPON THE QUALIFICATION BEING OBTAINED, UNLESS THE SALE IS SO EXEMPT.

                            [Signature Page Follows]

                                                                             -8-
<PAGE>

     The parties have executed this Agreement as of the date first set forth
above.

                                   PACIFIC DIGITAL MEDIA, INC.

                                   By: /s/ Anthony Wood
                                       --------------------------------

                                   Title:  Chairman of Board
                                          -----------------------------

                                   Address:
                                   555 Clyde Avenue
                                   Mountain View, CA 94043

     PURCHASER ACKNOWLEDGES AND AGREES THAT THE VESTING OF SHARES PURSUANT TO
SECTION 3 HEREOF IS EARNED ONLY BY CONTINUING SERVICE AS AN EMPLOYEE OR
CONSULTANT AT THE WILL OF THE COMPANY.  PURCHASER FURTHER ACKNOWLEDGES AND
AGREES THAT NOTHING IN THIS AGREEMENT SHALL CONFER UPON PURCHASER ANY RIGHT WITH
RESPECT TO CONTINUATION OF SUCH EMPLOYMENT OR CONSULTING RELATIONSHIP WITH THE
COMPANY, NOR SHALL IT INTERFERE IN ANY WAY WITH PURCHASER'S RIGHT OR THE
COMPANY'S RIGHT TO TERMINATE PURCHASER'S EMPLOYMENT OR CONSULTING RELATIONSHIP
AT ANY TIME, WITH OR WITHOUT CAUSE.

                                   PURCHASER:

                                   ANTHONY J. WOOD

                                   /s/ Anthony Wood
                                   -------------------------------
                                   (Signature)

                                   Address:

Vesting Commencement
Date: August 1, 1997

I, Susan P. Wood, spouse of Anthony J. Wood, have read and hereby approve
the foregoing Agreement. In consideration of the Company's granting my spouse
the right to purchase the Shares as set forth in the Agreement, I hereby agree
to be irrevocably bound by the Agreement and further agree that any community
property or other such interest shall be similarly bound by the Agreement. I
hereby appoint my spouse as my attorney-in-fact with respect to any amendment or
exercise of any rights under the Agreement.

                                   /s/ Susan P. Wood
                                   -------------------------------
                                   Spouse of Anthony J. Wood

                                                                             -9-
<PAGE>

                                   EXHIBIT A
                                   ---------

                     ASSIGNMENT SEPARATE FROM CERTIFICATE
                     ------------------------------------

     FOR VALUE RECEIVED and pursuant to that certain Common Stock Purchase
Agreement between the undersigned ("Purchaser") and Pacific Digital Media, Inc.
                                    ---------
(the "Company") dated _______________ (the "Agreement"), Purchaser hereby sells,
      -------                               ---------
assigns and transfers unto the Company _________________________________
(________) shares of the Common Stock of the Company standing in Purchaser's
name on the Company's books and represented by Certificate No. _____,  and does
hereby irrevocably constitute and appoint ______________________ to transfer
said stock on the books of the Company with full power of substitution in the
premises.  THIS ASSIGNMENT MAY ONLY BE USED AS AUTHORIZED BY THE AGREEMENT AND
THE EXHIBITS THERETO.

Dated: ______________________

                                     Signature:

                                     /s/ Anthony J. Wood
                                     ------------------------------
                                     Anthony J. Wood

                                     /s/ Susan P. Wood
                                     ------------------------------
                                     Spouse of Anthony J. Wood (if applicable)

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

                                   EXHIBIT B
                                   ---------

                   ACKNOWLEDGMENT AND STATEMENT OF DECISION
                   ----------------------------------------
                       REGARDING SECTION 83(b) ELECTION
                       --------------------------------

     The undersigned has entered into a stock purchase agreement with Pacific
Digital Media, Inc., a California corporation (the "Company"), pursuant to which
                                                    -------
the undersigned is purchasing 3,000,000 shares of Common Stock of the Company
(the "Shares").  In connection with the purchase of the Shares, the undersigned
      ------
hereby represents as follows:

     1.  The undersigned has carefully reviewed the stock purchase agreement
pursuant to which the undersigned is purchasing the Shares.

     2.  The undersigned either [check and complete as applicable]:

     (a)   X  has consulted, and has been fully advised by, the undersigned's
         ----
          own tax advisor, Laurie Crawford, whose business address is San Jose,
          California, regarding the federal, state and local tax consequences of
          purchasing the Shares, and particularly regarding the advisability of
          making elections pursuant to Section 83(b) of the Internal Revenue
          Code of 1986, as amended (the "Code") and pursuant to the
                                         ----
          corresponding provisions, if any, of applicable state law; or

     (b) ____ has knowingly chosen not to consult such a tax advisor.

     3.  The undersigned hereby states that the undersigned has decided [check
as applicable]:

     (a)   X  to make an election pursuant to Section 83(b) of the Code, and is
         ----
             submitting to the Company, together with the undersigned's executed
             Common Stock Purchase Agreement, an executed form entitled
             "Election Under Section 83(b) of the Internal Revenue Code of
             1986"; or

     (b) ____ not to make an election pursuant to Section 83(b) of the Code.
<PAGE>

     4.  Neither the Company nor any subsidiary or representative of the Company
has made any warranty or representation to the undersigned with respect to the
tax consequences of the undersigned's purchase of the Shares or of the making or
failure to make an election pursuant to Section 83(b) of the Code or the
corresponding provisions, if any, of applicable state law.

Date:    9/26/97                                  /s/ Anthony J. Wood
      -----------------------                     ---------------------------
                                                  Anthony J. Wood

Date:    9/26/97                                  /s/ Susan P. Wood
      -----------------------                     ---------------------------
                                                  Spouse of Anthony J. Wood

                                                                             -2-
<PAGE>

                                   EXHIBIT C
                                   ---------

                         ELECTION UNDER SECTION 83(b)
                         ----------------------------
                     OF THE INTERNAL REVENUE CODE OF 1986
                     ------------------------------------

     The undersigned taxpayer hereby elects, pursuant to Section 83(b) of the
Internal Revenue Code, to include in taxpayer's gross income for the current
taxable year, the amount of any compensation taxable to taxpayer in connection
with taxpayer's receipt of the property described below:

1.   The name, address, taxpayer identification number and taxable year of the
     undersigned are as follows:

     NAME OF TAXPAYER:  Anthony J. Wood

     NAME OF SPOUSE:  Susan D. Wood

     ADDRESS:  (omitted)

     IDENTIFICATION NO. OF TAXPAYER:  (omitted)

     IDENTIFICATION NO. OF SPOUSE:  (omitted)

     TAXABLE YEAR:  1997

2.   The property with respect to which the election is made is described as
     follows:

     3,000,000 shares of the Common Stock, $0.001 par value, of Pacific Digital
     Media, Inc., a California corporation (the "Company").

3.   The date on which the property was transferred is:  9/15/97

4.   The property is subject to the following restrictions:

     Repurchase option at cost in favor of the Company upon termination of
     taxpayer's employment or consulting relationship.

5.   The fair market value at the time of transfer, determined without regard to
     any restriction other than a restriction which by its terms will never
     lapse, of such property is:  $3,000.

6.   The amount (if any) paid for such property:  $3,000

The undersigned has submitted a copy of this statement to the person for whom
the services were performed in connection with the undersigned's receipt of the
above-described property.  The transferee of such property is the person
performing the services in connection with the transfer of said property.

The undersigned understands that the foregoing election may not be revoked
--------------------------------------------------------------------------
except with the consent of the Commissioner.
-------------------------------------------

Dated:   9/26/97                             /s/ Anthony J. Wood
       ----------------------                -----------------------------
                                             Taxpayer

Dated:   9/26/97                             /s/ Susan P. Wood
       ----------------------                -----------------------------
                                             Spouse of Taxpayer
<PAGE>

                                    RECEIPT
                                    -------

     Pacific Digital Media, Inc. hereby acknowledges receipt of a check in the
amount of $3,000 given by Anthony J. Wood as consideration for Certificate No.
____ for 3,000,000 shares of Common Stock of Pacific Digital Media, Inc.

Dated:      9/26/97
        ----------------

                                        PACIFIC DIGITAL MEDIA, INC.

                                        By: /s/ Edward M. Kessler
                                            ----------------------------

                                        Title:   President
                                               -------------------------
<PAGE>

                              RECEIPT AND CONSENT
                              -------------------

     The undersigned hereby acknowledges receipt of a photocopy of Certificate
No. _____ for 3,000,000 shares of Common Stock of Pacific Digital Media, Inc.
(the "Company").
      -------

     The undersigned further acknowledges that the Secretary of the Company, or
his or her designee, is acting as escrow holder pursuant to the Common Stock
Purchase Agreement Purchaser has previously entered into with the Company.  As
escrow holder, the Secretary of the Company, or his or her designee, holds the
original of the aforementioned certificate issued in the undersigned's name.

Dated:  _________________________

                                          ______________________________
                                          Anthony J. Wood

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