Document:

SHAREHOLDER'S AGREEMENT

      SHAREHOLDER'S AGREEMENT (the "Agreement"), dated as of August 24, 2001, by
and among Steelcase Inc., a Michigan corporation ("Parent"), PV Acquisition,
Inc., a New York corporation and a wholly owned subsidiary of Parent ("Merger
Sub"), and The Alpine Group, Inc. (the "Shareholder"), a Delaware corporation
and a shareholder of PolyVision Corporation, a New York corporation (the
"Company"). Capitalized terms used and not defined herein have the meanings
given them in the Agreement and Plan of Merger, dated as of the date hereof, by
and among Parent, Merger Sub and the Company (as the same may be amended or
supplemented from time to time, the "Merger Agreement").

      WHEREAS, concurrently herewith, Parent, Merger Sub and the Company are
entering into the Merger Agreement, pursuant to which, among other things: (i)
each outstanding share of Company Common Stock shall be canceled and shall be
converted automatically into the right to receive the Common Stock Merger
Consideration; (ii) each outstanding share of Series B Preferred Stock shall be
canceled and shall be converted automatically into the right to receive the
Series B Preferred Stock Merger Consideration; (iii) each outstanding share of
Series C Preferred Stock (all such outstanding shares, together with the
outstanding shares of Company Common Stock and Series B Preferred Stock being
referred to hereinafter collectively as the "Shares") shall be canceled and
shall be converted automatically into the right to receive the Series C
Preferred Stock Merger Consideration; (iv) each outstanding share of Series D
Preferred Stock shall be cancelled and shall be converted automatically into the
right to receive the Series D Preferred Stock Consideration; and (v) Merger Sub
will be merged with and into the Company (the "Merger"), upon the terms and
subject to the conditions set forth in the Merger Agreement;

      WHEREAS, the Shareholder Beneficially Owns (as defined in Section 1(a))
6,820,113 shares of Company Common Stock, 255,000 shares of Series B Preferred
Stock, and 140,000 shares of Series C Preferred Stock;

      WHEREAS,  the  Shareholder  has  received a true and correct copy of the
Merger Agreement; and

      WHEREAS, in order to induce Parent and Merger Sub to enter into the Merger
Agreement and to perform their obligations thereunder and as a condition
thereof, the Shareholder is entering into this Agreement.

      NOW, THEREFORE, in consideration of the foregoing and the mutual premises,
representations, warranties, covenants and agreements contained herein, the
parties hereby agree as follows:

      Section 1. Agreement to Vote; Irrevocable Proxy. (a) The Shareholder
hereby agrees that during the period commencing on the date of this Agreement
and continuing until (x) if the Option (as defined in Section 2(a)) is
exercised, the Option

                                      B-1
<PAGE>

Closing (as defined in Section 2(c)) or (y) if the Option is not exercised, the
Option Expiration Time (as applicable, the "Voting Expiration Time"), at any
meeting of the holders of any of the Shares, however called, or in connection
with any written consent of the holders of any of the Shares, the Shareholder
shall vote (or cause to be voted) the Shares held of record or Beneficially
Owned by the Shareholder, whether owned on the date hereof or hereafter
acquired, (i) in favor of approval of the Merger Agreement, all transactions
contemplated thereby, and any actions required in furtherance thereof and
hereof; (ii) against any action or agreement that is intended, or could
reasonably be expected, to impede, interfere with, or prevent the Merger or
result in a breach in any material respect of any covenant, representation or
warranty or any other obligation or agreement of the Company or any of its
subsidiaries under the Merger Agreement; and (iii) except as specifically
requested in writing in advance by Parent, against any of the following actions
(other than the Merger and the transactions contemplated by the Merger
Agreement) that are submitted to a vote of the holders of the Shares: (A) any
extraordinary corporate transaction, such as a merger, consolidation or other
business combination involving the Company or any of its Subsidiaries; (B) any
sale, lease, transfer or disposition by the Company or any of its Subsidiaries
of any assets which in the aggregate are material to the Company and its
Subsidiaries taken as a whole, or a reorganization, recapitalization,
dissolution or liquidation of the Company or any of its subsidiaries; (C)(1) any
change in the present capitalization of the Company or any amendment of the
Company's certificate of incorporation or by-laws; (2) any other material change
in the corporate structure or business of the Company or any of its
subsidiaries; or (3) any other action or agreement that is intended, or could
reasonably be expected, to impede, interfere with or prevent the Merger or the
transactions contemplated by the Merger Agreement.

      As used in this Agreement, the term "Beneficially Own" or "Beneficial
Ownership" with respect to any securities means having "beneficial ownership" of
such securities as determined pursuant to Rule 13d-3 under the Exchange Act,
including pursuant to any agreement, arrangement or understanding, whether or
not in writing, except that the term shall not include Shares which the
Shareholder has the right to acquire under any options to acquire Shares from
the Company ("Company Stock Options") unless such Shares have been acquired upon
exercise of such Company Stock Options.

            (b) Effective immediately upon the execution of this Agreement, and
in order to secure its obligations hereunder, the Shareholder hereby grants to,
and appoints Parent and any designee of Parent, and each of them individually,
with full power of substitution and resubstitution, the Shareholder's true and
lawful irrevocable (until the Voting Expiration Time) proxy to vote the
Shareholder's Shares, or grant a consent or approval in respect of the
Shareholder's Shares, solely on such matters and as indicated in Section 1(a)
above. The Shareholder (i) agrees to take such further action and execute such
other instruments as may be reasonably necessary to effectuate the intent of
this proxy, (ii) hereby represents that any proxy heretofore given in respect of
the Shareholder's Shares is not irrevocable, and (iii) hereby revokes any proxy
previously granted by the Shareholder with respect to its Shares. The
Shareholder understands and acknowledges that Parent and Merger Sub are entering
into the Merger Agreement in

                                      B-2
<PAGE>

reliance on the Shareholder's execution and delivery of this irrevocable proxy.
The Shareholder hereby affirms that this irrevocable proxy is given in
connection with the execution of this Agreement and the Merger Agreement, and
further affirms that this irrevocable proxy is coupled with an interest in this
Agreement for the term stated herein and may under no circumstances be revoked
prior to the Voting Expiration Time. This proxy is executed and intended to be
irrevocable for the above-stated term in accordance with the provisions of
Section 609 of the BCL.

      Section 2. Grant of Option. (a) Subject to the terms of this Section 2,
the Shareholder hereby grants to Parent and Merger Sub an irrevocable option
(the "Option") to purchase for cash all, but not less than all, of the Shares
held of record or Beneficially Owned by the Shareholder at a purchase price per
Share equal to the Common Stock Merger Consideration, the Series B Preferred
Stock Merger Consideration, or the Series C Preferred Stock Merger Consideration
(in each case, as applicable, the "Per Share Amount").

            (b) Parent (or Merger Sub) may exercise the Option at any time from
and after any termination of the Merger Agreement and prior to 11:59 p.m.,
Eastern time, on the 30th day after the date of such termination (the "Option
Expiration Time").

            (c) To exercise the Option, Parent (or Merger Sub) shall give
written notice (the "Notice") to the Shareholder specifying the time for the
closing (the "Option Closing") of such purchase. The Option Closing shall be
held at the office of Skadden, Arps, Slate, Meagher & Flom LLP on the date that
is 10 business days after the date of the Notice, subject to the satisfaction of
each of the conditions set forth in Section 2(d) below, or such other date as
may be agreed to by the Shareholder and Parent.

            (d) The occurrence of the Option Closing shall be subject to the
satisfaction of each of the following conditions:

                  (i) to the extent necessary, any applicable waiting periods
            (and any extension thereof) under the HSR Act with respect to the
            purchase of the Shareholder's Shares following the exercise of the
            Option shall have expired or been terminated; and

                  (ii) no preliminary or permanent injunction or other order,
            decree or ruling issued by any court of competent jurisdiction, and
            no statute, law, rule or regulation enacted or promulgated by any
            Governmental Entity, prohibiting the exercise of the Option or the
            delivery of the Shareholder's Shares pursuant thereto shall be in
            effect.

            (e) If Parent exercises the Option, Parent may sell or transfer the
Shares acquired upon exercise of the Option at any time, without the consent of
the Shareholder, to Merger Sub; provided, however, that no such sale or transfer
shall relieve Parent of its liabilities and obligations hereunder, including the
obligation to pay the consideration described in Section 2(a) and to comply with
Section 10.

                                      B-3
<PAGE>

            (f) At the Option Closing, (i) Parent (or Merger Sub) shall pay, by
wire transfer of immediately available funds to an account designated by the
Shareholder, an amount (the "Option Exercise Price") equal to the sum of (A) the
product of (x) the applicable Per Share Amount and (y) the number of shares of
Company Common Stock delivered at the Option Closing, (B) the product of (x) the
applicable Per Share Amount and (y) the number of shares of Series B Preferred
Stock delivered at the Option Closing and (C) the product of (x) the applicable
Per Share Amount and (y) the number of shares of Series C Preferred Stock
delivered at the Option Closing; and (ii) the Shareholder shall deliver or shall
cause to be delivered to Parent (or Merger Sub) a certificate or certificates
evidencing the Shareholder's Shares, and the Shareholder agrees that such Shares
shall be transferred free and clear of all liens. All such certificates
representing such Shares shall be duly endorsed in blank, or with appropriate
stock powers, duly executed in blank, attached thereto, in proper form for
transfer, and with all applicable taxes paid or provided for, subject to Section
15(i).

      Section 3. After-Acquired Shares. Notwithstanding anything herein to the
contrary, any Shares acquired by the Shareholder after the date hereof, whether
by purchase or exchange, shall be subject to all of the representations,
warranties, covenants and agreements of the Shareholder contained herein. In the
event of a share dividend or distribution, or any change in the Shares by reason
of any share dividend, split-up, recapitalization, combination, exchange of
shares or the like, the term "Shares" shall be deemed to refer to and include
the Shares as well as all such share dividends and distributions and any shares
into which or for which any or all of the Shares may be changed or exchanged.

      Section 4. Other Covenants, Agreements, Representations and Warranties.
The Shareholder hereby represents, warrants and covenants to Parent and Merger
Sub as of the date hereof and as of the Option Closing as follows:

            (a) The Shareholder is the record and Beneficial Owner of the number
of Shares set forth in the Recitals hereto, which constitute all of the Shares
owned of record or Beneficially Owned by the Shareholder on the date hereof. The
Shareholder owns such Shares free and clear of all liens, claims, charges,
security interests, mortgages or other encumbrances, and such Shares are not
subject to any rights of first refusal, put rights, other rights to purchase or
encumber such Shares, or to any agreements other than this Agreement as to the
encumbrance, disposition or voting of such Shares. The Shareholder has sole
voting power and sole power to issue instructions with respect to such Shares,
sole power of disposition, sole power of conversion, sole power to demand
dissenters' rights and sole power to agree to all of the matters set forth in
this Agreement, in each case with respect to all of such Shares.

            (b) The Shareholder is a corporation duly organized, validly
existing and in good standing under the laws of the jurisdiction of its
incorporation.

            (c) The Shareholder has the requisite corporate power and authority
to execute and deliver this Agreement, and has the requisite corporate power and
authority to perform the transactions provided for or contemplated by this
Agreement. The

                                      B-4
<PAGE>

execution, delivery and performance by the Shareholder of this Agreement, and
the consummation by it of the transactions contemplated hereby, have been duly
and validly authorized by the Shareholder's board of directors, and no other
corporate action on the part of the Shareholder is necessary to authorize the
execution and delivery by the Shareholder of this Agreement and the consummation
by it of the transactions contemplated hereby. This Agreement has been duly
executed and delivered by the Shareholder and, assuming due and valid
authorization, execution and delivery hereof by Parent and Merger Sub, is a
valid and binding obligation of the Shareholder enforceable against the
Shareholder in accordance with its terms, except that (i) such enforcement may
be subject to applicable bankruptcy, insolvency or other similar laws, now or
hereafter in effect, affecting creditors' rights and remedies generally, and
(ii) the remedy of specific performance and injunctive and other forms of
equitable relief may be subject to equitable defenses and to the discretion of
the court before which any proceeding therefor may be brought.

            (d) None of the execution, delivery or performance of this Agreement
by the Shareholder, the consummation by the Shareholder of the transactions
contemplated hereby or compliance by the Shareholder with any of the provisions
of this Agreement will (i) conflict with or result in any breach of any
provision of the certificate of incorporation or the by-laws of the Shareholder,
(ii) require any filing by the Shareholder with, or permit, authorization,
consent or approval of, any Governmental Entity (except for (A) the filing with
the SEC of such reports and statements under the Exchange Act as may be required
in connection with this Agreement and the transactions contemplated hereby and
(B) any filings as may be required under the HSR Act), (iii) result in a
violation or breach of, or constitute (with or without due notice or lapse of
time or both) a default (or give rise to any right of termination, amendment,
cancellation or acceleration) under, any of the terms, conditions or provisions
of any material note, bond, mortgage, lien, indenture, lease, license, contract,
agreement or other instrument or obligation to which the Shareholder or any of
its Subsidiaries (which, for the avoidance of any doubt, does not include the
Company and its Subsidiaries) is a party or by which any of them or any of their
respective properties or assets may be bound, except for those as to which any
required consents, approvals or waivers have been obtained or (iv) violate any
material order, writ, injunction, decree, statute, rule or regulation applicable
to the Shareholder, any of its Subsidiaries (which, for the avoidance of any
doubt, does not include the Company and its Subsidiaries) or any of their
respective properties or assets. The consummation of the Merger will not
conflict with or result in any breach of any of the terms of the Series B
Preferred Stock or the Series C Preferred Stock.

            (e) No broker, finder or investment banker is entitled to any
brokerage, finder's or other similar fee or commission in connection with the
transactions contemplated by the Merger Agreement based upon arrangements made
by or on behalf of the Shareholder.

            (f) The Shareholder shall not, directly or indirectly, encourage,
solicit, participate in or initiate discussions or negotiations with or provide
any non-public information to any Person or group (other than Parent and Merger
Sub or any designees or Parent and Merger Sub) concerning any Acquisition
Proposal. In addition, the

                                      B-5
<PAGE>

Shareholder will not, and will instruct its agents and affiliates not to,
directly or indirectly, make or authorize any public statement, recommendation
or solicitation in support of any Acquisition Proposal made by any Person or
group (other than Parent or Merger Sub). Notwithstanding the foregoing, any
action taken by the Company or any member of the Company Board of Directors, in
his capacity as such, in accordance with Section 6.3 of the Merger Agreement
shall be deemed not to violate this Section 4(f).

            (g) The Shareholder shall not, directly or indirectly: (i) tender
its Shares in any tender offer or exchange offer for the Shares; (ii) except as
contemplated by this Agreement or the Merger Agreement, otherwise offer for
sale, sell, transfer, tender, pledge, encumber, assign or otherwise dispose of,
or enter into any contract, option or other arrangement or understanding with
respect to or consent to the offer for sale, transfer, tender, pledge,
encumbrance, assignment or other disposition of, any or all of its Shares or any
interest therein; (iii) except as contemplated by this Agreement, grant any
proxies or powers of attorney, deposit any of its Shares into a voting trust or
enter into a voting agreement with respect to any Shares; (iv) take any action
that would make any representation or warranty of the Shareholder contained
herein untrue or incorrect in any material respect or have the effect of
preventing or impairing the Shareholder from performing its obligations under
this Agreement; or (v) enter into any agreement, arrangement or understanding
with the intent or effect of delaying, terminating, preventing or affecting
negatively the consummation of the Merger and the other transactions
contemplated by the Merger Agreement.

            (h) The Shareholder hereby acknowledges and agrees that the Series B
Preferred Stock Merger Consideration and the Series C Preferred Stock Merger
Consideration, or any higher price as may be paid for any such Shares in the
Merger, as the case may be, are in full satisfaction of all obligations of the
Company to the Shareholder related to the Series B Preferred Stock and Series C
Preferred Stock, and upon receipt of such consideration, any and all claims of
the Shareholder against the Company or any of its affiliates relating to the
Series B Preferred Stock or the Series C Preferred Stock shall be waived and
released.

            (i) The Shareholder understands and acknowledges that Parent and
Merger Sub are relying upon the foregoing representations, warranties and
covenants by the Shareholder, and on the Shareholder's execution and delivery of
this Agreement in entering into the Merger Agreement.

      Section 5. Other Representations and Warranties of Parent and Merger Sub.
Parent and Merger Sub hereby represent and warrant to the Shareholder as of the
date hereof and as of the Option Closing as follows:

            (a) Each of Parent and Merger Sub is a corporation duly organized,
validly existing and in good standing under the laws of the jurisdiction of its
incorporation.

            (b) Each of Parent and Merger Sub has the requisite corporate power
and authority to execute and deliver this Agreement, and has the requisite
corporate

                                      B-6
<PAGE>

power and authority to perform the transactions provided for or contemplated by
this Agreement. The execution, delivery and performance by each of Parent and
Merger Sub of this Agreement, and the consummation by it of the transactions
contemplated hereby, have been duly and validly authorized by its board of
directors, and no other corporate action on the part of Parent or Merger Sub is
necessary to authorize the execution and delivery by Parent and Merger Sub of
this Agreement and the consummation by Parent and Merger Sub of the transactions
contemplated hereby. This Agreement has been duly executed and delivered by each
of Parent and Merger Sub and, assuming due and valid authorization, execution
and delivery hereof by the Shareholder, is a valid and binding obligation of
each of Parent and Merger Sub enforceable against Parent and Merger Sub in
accordance with its terms, except that (i) such enforcement may be subject to
applicable bankruptcy, insolvency or other similar laws, now or hereafter in
effect, affecting creditors' rights generally, and (ii) the remedy of specific
performance and injunctive and other forms of equitable relief may be subject to
equitable defenses and to the discretion of the court before which any
proceeding therefor may be brought.

            (c) None of the execution, delivery or performance of this Agreement
by Parent and Merger Sub, the consummation by Parent and Merger Sub of the
transactions contemplated hereby or compliance by Parent and Merger Sub with any
of the provisions of this Agreement will (i) conflict with or result in any
breach of any provision of their respective certificates of incorporation and
by-laws, (ii) require any filing by Parent or Merger Sub with, or permit,
authorization, consent or approval of, any Governmental Entity (except for (A)
the filing with the SEC of such reports and statements under the Exchange Act as
may be required in connection with this Agreement and the transactions
contemplated hereby and (B) any filings as may be required under the HSR Act),
(iii) result in a violation or breach of, or constitute (with or without due
notice or lapse of time or both) a default (or give rise to any right of
termination, amendment, cancellation or acceleration) under, any of the terms,
conditions or provisions of any material note, bond, mortgage, lien, indenture,
lease, license, contract, agreement or other instrument or obligation to which
Parent or Merger Sub or any of their respective Subsidiaries is a party or by
which any of them or any of their respective properties or assets may be bound,
except for those as to which any required consents, approvals or waivers have
been obtained or (iv) violate any material order, writ, injunction, decree,
statute, rule or regulation applicable to Parent or Merger Sub, any of their
respective Subsidiaries or any of their respective properties or assets.

            (d) Either Parent or Merger Sub has available and has reserved or
has received written commitments from third-party lenders to obtain, sufficient
funds to consummate the Merger, the Offer and the other transactions
contemplated by the Merger Agreement or this Agreement, including payment in
full of (a) the Merger Consideration or the Option Exercise Price, (b) the
amounts payable under Sections 3.5, 3.6 and 3.7 of the Merger Agreement and (c)
all indebtedness (including principal, accrued interest, prepayment fees and
other charges) of the Company outstanding on the date of this Agreement.

      Section 6. Conditions to Obligations of Parent and Merger Sub. The
Shareholder acknowledges that the obligations of Parent and Merger Sub to
consummate

                                      B-7
<PAGE>

the Merger are subject to the satisfaction or waiver (where permissible) of each
of the conditions set forth in the Merger Agreement, including the compliance by
the Shareholder with the provisions of this Agreement.

      Section 7. Further Assurances. From time to time, at Parent's reasonable
request and without further consideration, the Shareholder agrees to execute and
deliver such additional documents and take all such further lawful action as may
be necessary or desirable to consummate and make effective, in the most
expeditious manner practicable, the transactions contemplated by this Agreement.

      Section 8. Stop Transfer; Form of Legend. The Shareholder agrees and
covenants to Parent that the Shareholder shall not, prior to the Option Closing
or, if the Option is not exercised, prior to the Option Expiration Time, except
as otherwise provided herein or pursuant to the Merger Agreement, (a) transfer
or encumber or agree to transfer or encumber any of the Shareholder's Shares or
(b) request that the Company register the transfer (book-entry or otherwise) of
any certificate or uncertificated interest representing any of the Shareholder's
Shares, in either case without the consent of the Parent. If reasonably
requested by Parent, any certificates representing the Shareholder's Shares
shall contain the following legend:

            "The securities  represented by this certificate are subject
            to certain  restrictions  on  transfer  and other terms of a
            Shareholder's Agreement,  dated as of August 24, 2001, among
            Steelcase Inc., PV Acquisition,  Inc., and The Alpine Group,
            Inc., a copy of which is on file in the principal  office of
            Steelcase Inc."

      Section 9. Indemnification. (a) The Shareholder agrees to indemnify,
defend and hold Parent, Merger Sub, their officers, directors, employees,
agents, representatives and affiliates ("Indemnified Parties") harmless from and
in respect of any and all losses, damages, costs and expenses (including
demands, suits, claims, actions, assessments, liabilities, judgments, amounts
paid in settlement, expenses of investigation and reasonable fees and
disbursements of counsel and other professionals) (collectively, "Losses"), that
they may incur arising out of or due to (i) the inaccuracy or breach of any
representation or warranty of the Shareholder contained in this Agreement, (ii)
the breach by the Shareholder of any covenant, undertaking or other agreement
contained in this Agreement and (iii) enforcing the indemnification rights
pursuant to this Section 9(a).

            (b) If any Indemnified Party shall believe that such Indemnified
Party is entitled to indemnification pursuant to this Section 9, such
Indemnified Party shall promptly give to the Shareholder written notice thereof.
The failure of such Indemnified Party to give notice of any claim for
indemnification promptly shall not adversely affect such Indemnified Party's
right to indemnity hereunder, except to the extent that the Shareholder is
prejudiced by the delay in giving notice. All such claims for indemnification
shall be made not later than, and the representations and warranties of the
Shareholder contained in this Agreement (other than the representations and
warranties set forth in subsections (a), (b), (c) and (e) of Section 4, which
shall survive indefinitely) shall not survive beyond, midnight on the date that
is one year after the first to occur of

                                      B-8
<PAGE>

the Effective Time and the Option Closing. The right to indemnification
hereunder shall not be affected by any investigation or any knowledge acquired
(or capable of being acquired) at any time, whether before or after the
execution and delivery of this Agreement.

      Section 10. Obligation  After  Option  Closing to Acquire All  Minority
Interests.

            (a) Parent agrees that, as promptly as reasonably practicable (but,
in any case, not later than five business days) after the Option Closing, Parent
shall commence (within the meaning of Rule 14d-2 under the Exchange Act) an
offer to purchase for cash (the "Offer") all, but not less than all, of the
outstanding shares of Company Common Stock owned by the holders of Company
Common Stock (other than Parent and Merger Sub) and the outstanding shares of
Series D Preferred Stock (collectively, the "Company Securities"), (i) in the
case of the Company Common Stock, at a price per share, net to the seller in
cash, that is not less than the Per Share Amount paid with respect to the
Company Common Stock as part of the Option Exercise Price (the "Common Stock
Reference Price") and (ii) in the case of the Series D Preferred Stock, at a
price per share, net to the seller in cash, that is not less than the Series D
Preferred Stock Merger Consideration (the "Series D Reference Price").

            The obligation of Parent to accept for payment and to pay for
Company Securities validly tendered in the Offer and not subsequently withdrawn
shall be subject only to (i) the condition that there shall not be any statute,
rule, regulation, judgment, order or injunction enacted, entered, enforced or
promulgated by any Governmental Entity which restrains, prevents or prohibits
the making or consummation of the Offer or the consummation of the Secondary
Merger (as defined below); provided, however, that Parent shall use commercially
reasonable efforts to have any such statute, rule, regulation, judgment, order
or injunction vacated or lifted; and (ii) such conditions as, after consultation
with Parent's outside legal counsel, Parent determines in good faith are
required by applicable law with respect to the Offer.

            (b) Following Parent's or Merger Sub's acceptance for payment of and
payment for Company Securities pursuant to the Offer (the "Acceptance Time"),
Parent shall take all action reasonably necessary to cause consummation as
promptly as reasonably practicable of a second-step merger (the "Secondary
Merger") in which (i) the holders of the outstanding Company Securities will
receive per-share consideration, net to such holders in cash, without interest
thereon and less any applicable withholding of taxes, equal to (A) the Series D
Reference Price, in the case of Series D Preferred Stock, or (B) the Common
Stock Reference Price, in the case of Company Common Stock, and (ii) each
option, warrant or other right to purchase Company Common Stock will (1) to the
extent consistent with the terms thereof, be canceled immediately prior to the
consummation of the Secondary Merger, in consideration for which cancellation
the holder of such option, warrant or right shall receive a payment of cash
consideration equal to the product of (A) the total number of shares of Company
Common Stock subject to such option, warrant or right immediately prior to the
consummation of the Secondary Merger and (B) the excess (if any) of (x) the
Common Stock Reference Price over (y) the exercise price per share subject to
such option, warrant or right as in effect

                                      B-9
<PAGE>

immediately prior to the consummation of the Secondary Merger (such payment to
be without interest thereon and net of any withholding of taxes); (2) to the
extent consistent with the terms thereof, represent the right, from and after
the consummation of the Secondary Merger, upon exercise thereof and payment of
the aggregate exercise price with respect thereto, to receive in cash, without
interest, a single lump sum cash payment equal to the product of (A) the number
of shares of Company Common Stock that would have been subject to issuance upon
the exercise of such option, warrant or right, had such exercise occurred
immediately prior to the consummation of the Secondary Merger, and (B) the
Common Stock Reference Price (such cash payment to be reduced by any required
withholding of taxes); or (3) otherwise be treated in accordance with the terms
thereof.

            Without limiting the generality of any of the foregoing, after
commencement of the Offer, Parent shall use its reasonable best efforts to
acquire (or to cause Merger Sub to acquire) pursuant to the Offer such number of
shares of Company Common Stock that, together with the shares of Company Common
Stock then owned by Parent and Merger Sub, will be sufficient to enable the
Secondary Merger to be consummated pursuant to Section 905 of the BCL (the
"Requisite Number"), and, if the Requisite Number is so acquired in the Offer,
Parent shall, promptly following the Acceptance Time, take all action reasonably
necessary to cause the Secondary Merger to be so consummated as promptly as
reasonably practicable pursuant to Section 905 of the BCL.

            (c) The Offer and the Secondary Merger shall be conducted in
compliance with all applicable laws. Promptly after the Option Closing, Parent
shall make a public announcement stating that it intends promptly to commence
the Offer, describing the terms of the Offer, and stating that the Offer will
not be subject to any financing contingency and will be unconditional (except as
provided in the last sentence of Section 10(a)).

      It is intended by the parties to this Agreement that the Company shall
have the right to take all measures it may deem, in its sole discretion, to be
necessary or desirable for the purpose of enforcing the provisions of this
Section 10.

      At all times prior to the date on which Parent or Merger Sub shall have
acquired all outstanding shares of Company Common Stock (other than shares owned
by Parent or Merger Sub) and options and warrants to purchase Company Common
Stock as provided in this Section 10, the authorization of the Continuing
Directors (as defined below) shall be required (and such authorization shall
constitute the authorization of the full Company Board of Directors and no other
action on the part of the Company, including any action by any other directors
of the Company, shall be required) to enforce on behalf of the Company and the
holders of Company Common Stock (other than Parent or Merger Sub) and options
and warrants to purchase Company Common Stock the provisions of this Section 10,
including any extension of the time for performance of any obligation or action
under this Section 10 or any waiver of compliance by Parent (or Merger Sub) with
the provisions of this Section 10.

                                      B-10
<PAGE>

      For purposes of this Section 10(c), "Continuing Directors" means the
members of the Special Committee as constituted on the date hereof or any
successor or substitute directors appointed by such members of the Special
Committee serving on the date hereof.

      Section 11. Termination.  This Agreement  shall  terminate at the Option
Expiration Time if the Option has not theretofore been exercised.

      Section 12. Effect of Termination. In the event of a termination of this
Agreement as provided in Section 11 hereof, this Agreement shall forthwith
become void and there shall be no liability or obligation hereunder on the part
of Parent, Merger Sub or the Shareholder thereafter; provided, however, that
nothing herein shall relieve any party for liability for any willful breach
hereof prior to such termination

      Section 13. Non-Competition. Except as set forth in this Section 13, the
Shareholder agrees that, to assure that Parent will retain the value of the
business of the Company and the Company Subsidiaries as a "going concern," for a
period of five years beginning on the earlier of the Effective Time or the
Option Closing, the Shareholder shall not, directly or indirectly, through one
or more affiliates, engage or have an interest, anywhere in the United States or
Europe, alone or in association with others, as partner or stockholder or
through the investment of capital, lending of money or property, or otherwise,
in any business that competes with the products and services provided by the
Company or any Company Subsidiary as of such date; provided, however, that it
shall not be a violation of this Section 13 for the Shareholder or any of its
affiliates to (i) invest in securities representing less than 10 percent of the
outstanding capital stock of any Person, the securities of which are publicly
traded or listed on any securities exchange or automated quotation system, or
(ii) invest in, own an interest in or acquire, in a single transaction or series
of transactions, all or a majority of the equity interests in, or assets of, any
Person that did not derive at least 25 percent of its consolidated net revenue
during its last completed fiscal year from any business that competes with the
products and services provided by the Company or any Company Subsidiary as of
the date referenced above. During the three years beginning on the earlier of
the Effective Time or the Option Closing, the Shareholder shall not, directly or
indirectly, through one or more affiliates, on behalf of itself or any other
Person, (i) recruit or otherwise solicit or induce any person who is an employee
of, or otherwise engaged by, Parent, the Company or any Company Subsidiary or
any of their successors to terminate his or her employment or other relationship
with Parent, the Company or any Company Subsidiary or (ii) offer employment to
or employ a person who is at that time an employee (other than secretarial or
clerical employees) of Parent, the Company or any Company Subsidiary or who was
such an employee within two years of the time of such offer of employment. The
foregoing shall not, however, prohibit the Shareholder or any of its affiliates
from publishing any general public solicitation of employment opportunities.

      Section 14. Jurisdiction. Each of the parties hereto hereby expressly and
irrevocably submits to the non-exclusive personal jurisdiction of the United
States District Court for the Southern District of New York, and to the
jurisdiction of any other competent court of the State of New York located in
New York County (collectively, the

                                      B-11
<PAGE>

"New York Courts"), preserving, however, all rights of removal to such federal
court under 28 U.S.C. Section 1441, in connection with all disputes arising out
of or in connection with this Agreement or the transactions contemplated hereby
and agrees not to commence any litigation relating thereto except in such
courts. If the aforementioned courts do not have subject matter jurisdiction,
then the proceeding shall be brought in any other state or federal court located
in the State of New York, preserving, however, all rights of removal to such
federal court under 28 U.S.C. Section 1441. Each party hereby waives the right
to any other jurisdiction or venue for any litigation arising out of or in
connection with this Agreement or the transactions contemplated hereby to which
any of them may be entitled by reason of its present or future domicile.

      Section 15. Miscellaneous.

            (a) This Agreement (i) constitutes the entire agreement among
Parent, Merger Sub and the Shareholder with respect to the subject matter hereof
and supersedes all other prior agreements and understandings, both written and
oral, among such parties or any of them with respect to the subject matter
hereof and (ii) except as provided in Section 9, and except for the Company's
right to enforce Section 10, is not intended to confer upon any Person other
than the parties hereto any rights or remedies hereunder.

            (b) All rights, powers and remedies provided under this Agreement or
otherwise available in respect hereof at law or in equity shall be cumulative
and not alternative, and the exercise of any thereof by any party shall not
preclude the simultaneous or later exercise of any other such right, power or
remedy by such party.

            (c) The failure of any party hereto to exercise any right, power or
remedy provided under this Agreement or otherwise available in respect hereof at
law or in equity, or to insist upon compliance by any other party hereto with
its obligations hereunder, shall not constitute a waiver by such party of its
right to exercise any such or other right, power or remedy or to demand such
compliance.

            (d) Subject to applicable law and as otherwise provided in the
Agreement, this Agreement may be amended, modified and supplemented in any and
all respects, by written agreement of Parent, Merger Sub and the Shareholder, by
action taken by their respective boards of directors or equivalent governing
bodies. This Agreement may not be amended except by an instrument in writing
signed on behalf of each of Parent, Merger Sub and the Shareholder; provided,
that no such instrument that amends, modifies or supplements Section 10 shall be
effective unless signed by the Company.

            (e) If any term or other provision of this Agreement is invalid,
illegal or incapable of being enforced by rule of law or public policy, all
other conditions and provisions of this Agreement shall nevertheless remain in
full force and effect so long as the economic or legal substance of the
transactions contemplated hereby is not affected in any manner adverse to any
party. Upon such determination that any term or other provision is invalid,
illegal or incapable of being enforced, the parties hereto shall negotiate in
good faith to modify this Agreement so as to effect the original intent of the

                                      B-12
<PAGE>

parties as closely as possible in an acceptable manner to the end that the
transactions contemplated hereby are fulfilled to the extent possible.

            (f) All notices and other communications hereunder shall be in
writing and shall be deemed given if delivered personally, telecopied (which is
confirmed) or sent by a nationally recognized overnight courier service, such as
Federal Express (providing proof of delivery), to the parties at the following
addresses (or at such other address for a party as shall be specified by like
notice):

                        (i)  if to Parent or Merger Sub, to:

                        Steelcase Inc.
                        901 - 44th Street, S.E.
                        Grand Rapids, Michigan 49508
                        Telephone: (616) 246-9600
                        Facsimile: (616) 248-7010
                        Attention: Chief Legal Officer

                        with a copy to:

                        Skadden, Arps, Slate, Meagher & Flom (Illinois)
                        333 West Wacker Drive
                        Chicago, Illinois 60606
                        Telephone: (312) 407-0700
                        Facsimile: (312) 407-0411
                        Attention: Charles W. Mulaney, Jr., Esq.

                        (ii)  if to the Shareholder, to:

                        The Alpine Group, Inc.
                        1790 Broadway
                        New York, New York 10019
                        Telephone: (212) 757-3333
                        Facsimile: (212) 757-3423
                        Attention: Corporate Secretary

                        with a copy to:

                        Proskauer Rose LLP
                        1585 Broadway
                        New York, New York 10036
                        Telephone: (212) 969-3000
                        Facsimile: (212) 969-2900
                        Attention: Ronald R. Papa, Esq.

                        and

                                      B-13
<PAGE>

                        (iii)  if to the Company, to:

                        PolyVision Corporation
                        4888 S. Old Peachtree Rd.
                        Norcross, Georgia 30071
                        Telephone: (770) 447-5043
                        Facsimile. (770) 446-5951
                        Attention: Michael H. Dunn,
                        President and Chief Executive Officer

                        with a copy to:

                        Greenberg Traurig, LLP
                        The Met Life Building
                        200 Park Avenue
                        New York, New York  10166
                        Telephone:  (212) 801-9200
                        Facsimile:  (212) 801-6400
                        Attention:  Clifford E. Neimeth, Esq.

            (g) This Agreement shall be governed by and construed in accordance
with the internal (substantive and procedural) laws of the State of New York,
without regard to the conflicts of laws principles thereof.

            (h) When a reference is made in this Agreement to Sections, such
reference shall be to a Section of this Agreement unless otherwise indicated.
Whenever the words "include", "includes" or "including" are used in this
Agreement they shall be deemed to be followed by the words "without limitation."
As used in this Agreement, the term "affiliates" shall have the meaning set
forth in Rule 12b-2 of the Exchange Act. The descriptive headings used herein
are inserted for convenience of reference only and are not intended to be part
of or to affect the meaning or interpretation of this Agreement.

            (i) Except as provided in Section 9, all fees, costs and expenses
incurred in connection with this Agreement and the transactions contemplated
hereby shall be paid by the party incurring such fees, costs and expenses except
that any transfer, stamp or similar taxes shall be borne by Parent.

            (j) This Agreement shall not be assigned by any of the parties
hereto (whether by operation of law or otherwise) without the prior written
consent of the other parties, except that Merger Sub may assign any or all of
its rights, interests and obligations hereunder to Parent, one or more direct or
indirect wholly-owned Subsidiaries of Parent, or a combination thereof.

            (k) Each of Parent, Merger Sub, the Shareholder and, for purposes of
Section 10 hereof, the Company acknowledges and agrees that in the event of any
breach of this Agreement, each non-breaching party would be irreparably and
immediately harmed and could not be made whole by monetary damages. It is
accordingly agreed that the parties hereto (a) will waive, in any action for
specific performance, the defense of adequacy of a remedy at law and (b) shall
be entitled, in addition to any other remedy to

                                      B-14
<PAGE>

which they may be entitled at law or in equity, to compel specific performance
of this Agreement.

            (l) This Agreement may be executed manually or by facsimile by the
parties hereto, in any number of counterparts, each of which shall be considered
one and the same agreement and shall become effective when a counterpart hereof
shall have been signed by each of the parties and delivered to the other
parties.

                            [Signature page follows.]

                                      B-15
<PAGE>

      IN WITNESS WHEREOF, the Shareholder, Parent and Merger Sub have caused
this Shareholder's Agreement to be duly executed as of the day and year first
above written.

                        STEELCASE INC.

                        By:  /s/ James P. Keane
                             ---------------------------------------------------
                        Name:   James P. Keane
                        Title:  Senior Vice President, Chief Financial Officer

                        PV ACQUISITION, INC.

                        By:  /s/ James P. Keane
                             ---------------------------------------------------
                        Name:   James P. Keane
                        Title:  Treasurer

                        THE ALPINE GROUP, INC.

                        By:  /s/ Bragi F. Schut
                             ---------------------------------------------------
                        Name:   Bragi F. Schut
                        Title:  Executive Vice President

Acknowledged and agreed to as of the day and year first above written, solely
for the purpose of enforcing the provisions of Section 10 hereof

POLYVISION CORPORATION

By:  /s/ Michael H. Dunn
     ---------------------------------------------------
     Name:   Michael H. Dunn
     Title:  President and Chief Executive Officer

                                      B-16<Page>

                                                                    Exhibit 4.12

THE FOLLOWING SYMBOL "CONFIDENTIAL TREATMENT REQUESTED[**]" INDICATES AN
OMITTED PORTION OF THIS AGREEMENT FOR WHICH CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED. THIS DOCUMENT HAS BEEN FILED IN ITS ENTIRETY UNDER SEPARATE COVER
WITH THE SECURITIES AND EXCHANGE COMMISSION.

   ON2 TECHNOLOGY AND REALNETWORKS DEVELOPMENT SERVICES AND LICENSE AGREEMENT

This On2 Technologies and RealNetworks Development Services and License
Agreement, dated as of July 18, 2001 (the "Agreement"), is by and between On2
Technologies, Inc., a Delaware corporation ("On2"), with offices located at 145
Hudson Street, New York, NY 10013, and RealNetworks, Inc., a Washington
corporation ("Real"), with offices located at 2601 Elliott Avenue, Seattle
Washington, 98121 (collectively, the "Parties").

The Parties agree as follows:

I.       DEFINITIONS

"AUTOUPDATE" means the feature by which Real downloads software components and
updates to Real software users.

"CHANGE OF CONTROL" means, with respect to any entity, (i) a sale of all or
substantially all of such entity's assets to another entity; (ii) the
assignment, transfer, or other disposition of the majority of such entity's
equity securities; or (iii) a merger of such entity with another entity, if as a
result of the transaction the holders of a majority or the first entity's equity
securities before the transaction hold less than a majority of the voting
securities of the surviving entity.

"EFFECTIVE DATE" means the date this Agreement is signed by both parties.

"INTELLECTUAL PROPERTY RIGHTS" means all rights in inventions, patents,
copyrights, database rights, design rights, trademarks and trade names, service
marks, trade secrets, know-how and other intellectual property rights (whether
registered or unregistered) and all applications for any of them, anywhere in
the world.

"NET REVENUE" means all royalty revenues actually received by Real from Set Top
Box manufacturers or Wireless Chip Device manufacturers less any taxes, shipping
and handling fees, credit card fees, chargebacks, returns, other bad debts and
third party royalty payments.

"NEW VERSION" CONFIDENTIAL TREATMENT REQUESTED [**]

"OBJECT CODE" means computer software in the form not readily perceivable by
humans and suitable for machine execution without the intervening steps of
interpretation or compilation.

"ON2 CODEC" CONFIDENTIAL TREATMENT REQUESTED [**]

"PLUG-IN" means a software component that can be separately downloaded and used
by the RealPlayer, RealJukebox, RealProducer or RealServer, as the case may be.
The Plug-in must
<Page>

communicate with the parent application appropriate proprietary Real APIs for
the respective function including: encoding, decoding, transcoding and device
transfer.

 "REALPLAYER" OR "REALPLAYER SOFTWARE" means the Real software product currently
known as the "RealPlayer" which enables an End User to play back Streams served
from the RealServer and any New Versions made generally available by Real.

"REALPRODUCER" or "REALSYSTEM PRODUCER" means the Real software product
currently known as the RealSystem Producer which enables the End User to encode
content into digital formats so that the content can be served by the Server
Software and any New Versions made generally available by Real. "REALPRODUCER"
as defined herein, unless specifically set forth otherwise, includes only
versions of the RealProducer that Real distributes free of charge from its
website, and does not include custom or premium versions of the RealProducer
(E.G., the RealProducer Pro).

"REALSERVER" or "REALSERVER SOFTWARE" means the Real software product, currently
known as the "RealServer", which is designed and developed by Real to serve
Streams to an endpoint where an End User with the RealPlayer can view/hear the
Streams and any New Versions made generally available by Real.

"SET TOP BOX" means a device that receives audio and video via internet protocol
or other network protocol and displays the video and/or audio on a TV.

"Software" has the meaning set forth in Section VI.

"SOURCE CODE" means the software code that is in human readable form and that is
used to compile the Object Code form of the Software.

"TERM" has the meaning set forth in Section X(A).

"UPDATE" means a release that provides minor functional and/or performance
enhancements and improvements, or corrections to errors.

"UPGRADE" means a release that provides some significant new functionality
and/or performance enhancements and improvements.

"VP4 CODEC" means the version of the encoding and decoding software, the
algorithms and bit streams used in the current generation of On2's VP4 product
and any New Versions.

"VP5 CODEC" means the version of the encoding and decoding software, the
algorithms and bit streams used in the current generation of On2's VP5 product
and any New Versions.

"WIRELESS CHIP DEVICE" means any microprocessor chip used to power cellular or
digital telephones, personal digital assistants ("PDA"), or other wireless
communications devices.

II.      ON2 CODEC DECODER PLUG-IN FOR REALPLAYER -- DEVELOPMENT AND LICENSE.

                                       2
<Page>

         A. REAL DELIVERABLES. Real will license to On2 its current version of
the RealSystem Software Development Kit ("RealSystem SDK") during the Term
subject to the terms and conditions set forth in Exhibit A. The RealSystem SDK
will be used by On2 to develop the RealPlayer Plugins for the On2 Codecs
described below. On2's development and distribution of the RealPlayer Plugins
and use of the RealSystem SDK are subject to the terms and conditions set forth
in the RealSystem SDK. On2 must use the most recent version of the RealSystem
SDK as provided by Real from time to time.

         B. ON2 DEVELOPMENT SERVICES. Upon receipt of the RealSystem SDK, On2
will develop software Plugins for the RealPlayer that enables the end user of
the RealPlayer to play files encoded using On2 Codecs (the "RealPlayer
Plugin(s)" CONFIDENTIAL TREATMENT REQUESTED [**] The Plugin must meet Real's
standard requirements for AutoUpdate components.

         C. DEVELOPER SUPPORT FROM REAL. In connection herewith, Real agrees to
provide On2 with e-mail and telephone support from Real's engineers during
normal business hours to answer On2's technical questions and assist On2 in its
development of the RealPlayer Plugins.

         D. AUTOUPDATE. Upon completion of the RealPlayer Plugin, Real agrees to
make the RealPlayer Plugin available to end users of the RealPlayer using its
AutoUpdate process, subject to the terms and conditions of the RealSystem SDK
AutoUpdate Amendment attached as Exhibit B (including its exhibits).
Notwithstanding the foregoing, in the event that On2 does not meet the
requirements set forth in Section F hereof after Real has provided On2 with
written notice of such failure and On2 has not cured such failure within 30 days
after such notice was sent, then Real may elect, in its sole discretion, to
cease distributing the RealPlayer Plugin via AutoUpdate.

         E. SOFTWARE LICENSE AND TRADEMARK LICENSE. (1) Upon completion of the
development of the RealPlayer Plugins, On2 will grant to Real a perpetual, fully
paid up, worldwide, non-transferable license to copy, install, use, perform and
distribute the RealPlayer Plugins, and any modifications made to the RealPlayer
Plugins, in binary executable form via electronic, physical or other means
through multiple tiers of distribution. Real hereby agrees to include a valid
copyright notice of On2 on any RealPlayer Plugins so installed, used or
distributed. In addition, On2 grants Real a limited, worldwide,
non-transferable, non-assignable (including by operation of law or otherwise),
non-exclusive, nonsublicensable license to use its trademarks or logos (the
"Marks") in connection with the installation, use and distribution of the
RealPlayer contemplated by this Agreement. On2 will provide to Real a copy of
its Marks to be used herein. Real agrees that it will comply with any On2
guidelines or conditions provided to it with respect to the style, appearance
and manner of use of the Marks used by Real.

(2) CONFIDENTIAL TREATMENT REQUESTED [**]

         F. MILESTONES.

                  (a) CONFIDENTIAL TREATMENT REQUESTED [**]
                  (b) CONFIDENTIAL TREATMENT REQUESTED [**]

III.     ON2 CODEC PLUG-IN FOR REALPRODUCER DEVELOPMENT AND LICENSE.

         A. REAL DELIVERABLES. Real will license to On2 a version of the
RealSystem Producer Software Development Kit with appropriate API's exposed
("RealProducer SDK") during the Term subject to the terms and conditions of RN's
RealProducer SDK Agreement, the

                                       3
<Page>

current form of which is set forth in Exhibit C. The RealProducer SDK will be
used by On2 to develop the RealProducer Plugins for the On2 Codecs which will
enable users of the RealProducer to encode content using the On2 Codecs. On2's
development and distribution of the RealProducer Plugin and use of the
RealProducer SDK are subject to the terms and conditions set forth in the
RealProducer SDK Agreement. On2 must use the most recent version of the
RealProducer SDK as provided by Real from time to time.

         B. ON2 DEVELOPMENT SERVICES. Upon receipt of the RealProducer SDK, On2
will develop the RealProducer Plugins that enable the end users of the
RealProducer to encode content using the On2 Codecs. CONFIDENTIAL TREATMENT
REQUESTED [**]

         Real's use of the RealProducer Plugins shall be subject to the license
terms described in this AGREEMENT. The RealProducer Plugins will meet the
feature sets for each of the platforms supported by RealProducer during the
Term. CONFIDENTIAL TREATMENT REQUESTED [**]

         C. DEVELOPER SUPPORT FROM REAL. In connection herewith, Real agrees to
provide On2 with e-mail and telephone support from Real's engineers during
normal business hours to answer On2's technical questions and assist On2 in its
development of the RealProducer Plugins.

         D. REALPRODUCER PLUGIN DISTRIBUTION AND ROYALTY PAYMENTS. (1) Real may
distribute the free version of the RealProducer Plugin in conjunction with the
RealProducer. In addition, Real may distribute the enhanced version of the
RealProducer Plugin described in Section III(G) below subject to its payment to
On2, on a quarterly basis, of a royalty of CONFIDENTIAL TREATMENT REQUESTED [**]
for the sale of each enhanced version RealProducer Plugin. Real will make all
payments within 30 days of the end of each quarter. Notwithstanding the
foregoing, Real shall be entitled to provide a free 30 day trial for the
enhanced version of the RealProducer Plugins and Real shall have no royalty
obligation for such free 30 day trials.

         E. REPORTS. Real will submit a quarterly report to On2 within 30 days
of the end of each quarter specifying the number of enhanced versions of the
RealProducer Plugins distributed by Real for such quarter. In addition, Real
agrees, upon reasonable request from On2, that, once each calendar year and at
On2's expense, it will make available sufficient information at its offices in
Seattle (including sales and accounting records, purchase orders, and other
records) to an independent accounting firm reasonably satisfactory to Real that
is not paid on a contingency basis, solely to enable such accounting firm to
verify the actual enhanced versions RealProducer Plugins distributed by Real in
connection herewith.

         F. REALPRODUCER PLUGIN LICENSE. On2 grants to Real a worldwide,
limited, non-transferable, perpetual license to install, copy, use and
distribute through multiple tiers of distribution the RealProducer Plugin in
Object Code form. Real hereby agrees to include a valid copyright notice of On2
on any RealProducer Plugin so installed, used or distributed. Real may not
sublicense, assign, transfer, rent, sell or lease all or any portion of the
RealProducer Plugin, except to the extent set forth above; or reverse engineer,
de-compile, disassemble, modify, translate, make any attempt to discover the
source code of the RealProducer Plugin. In addition, On2 grants Real a limited,
worldwide, non-transferable, non-assignable (including by operation of law or
otherwise), non-exclusive, nonsublicensable license to use its Marks in
connection with the co-branding set forth herein. On2 will provide to Real a
copy of its Marks to be used herein. Real agrees that it will comply with any
On2 guidelines or conditions provided to it with respect to the style,
appearance and manner of use of the Marks.

                                       4
<Page>

         G. CODEC DISTRIBUTION BY ON2. On2 may develop an enhanced version of
the RealProducer Plugin that has email and 800 number support features (the
"Enhanced RealProducer Plugin"). On2 will sell such Enhanced RealProducer Plugin
to its customers for an amount to be determined.

IV.      ON2 CODEC REALSERVER PLUG-IN DEVELOPMENT AND LICENSE.

         A. REAL DELIVERABLES. Real will license to On2 its current version of
the RealSystem Software Development Kit ("RealSystem SDK") during the Term
subject to the terms and conditions set forth in Exhibit A. The RealSystem SDK
will be used by On2 to develop the RealServer Plugins for the On2 Codecs
described below. On2's development and distribution of the RealServer Plugins
are subject to the terms and conditions set forth in the RealSystem SDK,
including the AutoUpdate provisions in Exhibit B CONFIDENTIAL TREATMENT
REQUESTED [**]. On2 must use the most recent version of the RealSystem SDK as
provided by Real from time to time.

         B. ON2 DEVELOPMENT SERVICES. Upon receipt of the RealSystem SDK, On2
will develop software Plugins for the RealServer that enable the RealServer to
stream files encoded using the On2 Codecs (the "RealServer Plugin").
CONFIDENTIAL TREATMENT REQUESTED [**] The RealServer Plugins will meet the
feature sets for each platform to which the RealServer has been ported.
CONFIDENTIAL TREATMENT REQUESTED [**].

         C. DEVELOPER SUPPORT FROM REAL. In connection herewith, Real agrees to
provide On2 with e-mail and telephone support from Real's engineers during
normal business hours to answer On2's technical questions and assist On2 in its
development of the RealServer Plugins.

         D. REALSERVER DISTRIBUTION AND ROYALTY PAYMENTS. CONFIDENTIAL TREATMENT
REQUESTED [**].

         E. REALSERVER PLUGIN LICENSE. On2 grants to Real a worldwide, limited,
non-transferable, perpetual license to install, copy, use, perform and
distribute through multiple tiers of distribution the RealServer Plugin in
Object Code form. Real hereby agrees to include a valid copyright notice of On2
on any RealServer Plugin so installed, used or distributed. Real may not
sublicense, assign, transfer, rent, sell or lease all or any portion of the
RealProducer Plugin, except to the extent set forth above; or reverse engineer,
de-compile, disassemble, modify, translate, make any attempt to discover the
source code of the RealServer Plugin. In addition, On2 grants Real a limited,
worldwide, non-transferable, non-assignable (including by operation of law or
otherwise), non-exclusive, nonsublicensable license to use its Marks in
connection with the co-branding set forth herein. On2 will provide to Real a
copy of its Marks to be used herein. Real agrees that it will comply with any
On2 guidelines or conditions provided to it with respect to the style,
appearance and manner of use of the Marks.

V.       EXCLUSIVITY

         A. CONFIDENTIAL TREATMENT REQUESTED [**]

         B. CONFIDENTIAL TREATMENT REQUESTED [**]

         C. EXCLUSIVITY IN DESIGNATED PLATFORMS AND ADDITIONAL ROYALTIES.

                                       5
<Page>

            CONFIDENTIAL TREATMENT REQUESTED [**]

         D. REPORT. Real will submit a quarterly report to On2 within 30 days of
the end of each quarter specifying the number of RealPlayer products distributed
by Real for such quarter that are subject to this section of the Agreement. In
addition, Real agrees, upon reasonable request from On2, that, once each
calendar year and at On2's expense, it will make available sufficient
information at its offices in Seattle (including sales and accounting records,
purchase orders, and other records) to an independent accounting firm reasonably
satisfactory to Real that is not paid on a contingency basis, solely to enable
such accounting firm to verify the actual RealPlayers distributed by Real under
this Section.

VI. TITLE. Title, ownership rights, and intellectual property rights in the
RealPlayer, the RealServer, the RealProducer, the RealSystem and RealProducer
SDKs and any modifications made by Real to the RealPlayer Plugin (collectively,
the "Real Products") shall remain solely with Real and its licensors except to
the extent of On2's rights in its technologies embodied in the RealPlayer
Plugin. Except for the licenses expressly granted herein, no other third party
rights to any of the Real Products or other intellectual property of Real and
its licensors shall be inferred or implied by this Agreement. Title, ownership
rights, and intellectual property rights in the RealPlayer Plugin, the
RealProducer Plugin and the RealServer Plugin (collectively, the "Software")
shall remain solely with On2 and its licensors except to the extent of Real's
rights in any underlying Real Products, including any elements of the Real SDK's
embodied in the Software. Except for the licenses expressly granted herein, no
other third party rights to any of the Software or other intellectual property
of On2 and its licensors shall be inferred or implied by this Agreement.

VII. LIMITATION OF LIABILITY. UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY,
TORT, CONTRACT, OR OTHERWISE, SHALL EITHER PARTY OR ITS LICENSORS BE LIABLE TO
THE OTHER PARTY OR ITS RELATED PARTIES FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES OF ANY CHARACTER INCLUDING, WITHOUT LIMITATION, DAMAGES
FOR LOSS OF GOODWILL, WORK STOPPAGE, COMPUTER FAILURE OR MALFUNCTION, OR ANY AND
ALL OTHER SUCH INDIRECT DAMAGES OR LOSSES, EVEN IF SUCH OTHER PARTY OR SUCH
OTHER PARTY'S RELATED ENTITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
OR SHOULD HAVE FORESEEN SUCH DAMAGES.

VIII. LIMITED WARRANTY AND DISCLAIMER. On2 warrants and represents that: (i)
it has the right to enter into this Agreement and grant the rights granted
herein; and (ii) to the best of its knowledge, the Software does not infringe
any Intellectual Property Rights and there are no pending or threatened
claims for infringement against On2 or its suppliers, or their licensees.
Except as expressly stated herein, the services of each party are provided
"as is", without warranties of any kind, either express or implied.

WITHOUT LIMITING THE FORGOING, EACH PARTY HEREBY DISCLAIMS ALL WARRANTIES NOT
EXPRESSLY STATED HEREIN. IN NO EVENT SHALL EITHER PARTY BE RESPONSIBLE FOR
ANY FACTORS AFFECTING SUCH PARTY'S PERFORMANCE UNDER THIS AGREEMENT WHICH ARE
BEYOND SUCH PARTY'S CONTROL INCLUDING BUT NOT LIMITED TO ANY FAILURE,
DISRUPTION, DOWNTIME, INTERRUPTION, DELAY, INNACURACY OR OTHER NONPERFORMANCE
IN CONNNECTION WITH THE SERVICES PROVIDED HEREUNDER.

IX. INDEMNIFICATION.

                                       6
<Page>

A. On2 will defend at its expense and indemnify and hold harmless Real from and
against any third party claim that any Intellectual Property Rights of the
claimant are infringed by Real's use of any of the Software or any Mark,
provided that (i) Real promptly notifies On2 in writing of any such claim, (ii)
On2 shall be accorded control of the defense and of all negotiations for
settlement or compromise of such claim, and (iii) Real cooperates with On2 in
the defense and settlement of such claim, including providing to On2 such
information and assistance as On2 may reasonably request. Real may, at its own
expense, be represented in such defense. On 2 will not, without Real's consent,
enter into any settlement or agree to any disposition that imposes an obligation
on Real that is not wholly discharged or dischargeable by On2, or imposes any
conditions or obligations on Real other than the payment of money that is
readily measurable for purposes of determining the monetary indemnification or
reimbursement obligations of On2.

B. On2 agrees that should any Mark or the Software or any portion thereof
become, or in On2's good faith opinion be likely to become, the subject of a
third party claim of infringement, or should use of the Software or any Mark be
enjoined, On2 may, at its option and expense, either:

(i) procure for Real the right to continue using the applicable Software or
Mark;

(ii) replace or modify the applicable Software to make it non-infringing without
substantially altering its functionality; or

(iii) with respect to Marks only, notify Real that it must stop all use of such
Mark. Upon receipt of such notice, Real shall promptly cease all use of the
applicable Mark.

C. To the extent the foregoing indemnification provisions conflict with
provisions in the Exhibits, the provisions in this Section will control.

X. TERM AND TERMINATION.

A. TERM. The initial term of this Agreement shall commence as of the Effective
Date and, unless earlier terminated as provided below, shall remain in effect
for four years after the Effective Date.

B. TERMINATION FOR BREACH. If either party breaches any material provision of
this Agreement and such breach has not been cured within 30 days after the
non-breaching party has given written notice to the breaching party of such
breach, then the non-breaching party may terminate this Agreement effective upon
three business days' notice to the breaching party.

C. TERMINATION FOR FAILURE TO REACH MILESTONES. Notwithstanding anything to the
contrary herein, Real shall have the right to terminate this Agreement upon 30
days written notice to On2 if On2 fails to meet any of the milestones set forth
in Section II(F).

D. TERMINATION FOR INSOLVENCY. Either party may terminate this Agreement
immediately upon notice to the other party should the other party: (i) admit in
writing its inability to pay its debts generally as they become due; (ii) make a
general assignment for the benefit of its creditors; (iii) institute proceedings
to be adjudicated a voluntary bankrupt, or consent to the filing of a petition
of bankruptcy against it; (iv) seek reorganization under any bankruptcy act, or
consent to the filing of a petition seeking such reorganization; or (v) have a
decree entered against it by a court of competent jurisdiction appointing a
receiver, liquidator, trustee or assignee in bankruptcy

                                       7
<Page>

or in insolvency covering all or substantially all of such party's property or
providing for the liquidation of such party's property or business affairs,
provided that such decree is not vacated within sixty (60) days.

XI. CONFIDENTIAL INFORMATION.

A. From the date of execution hereof for a period of three (3) years from
termination of this Agreement, neither party shall use, disclose, or permit any
person to obtain any Confidential Information of the other party, including any
materials developed or generated hereunder (whether or not such confidential
information is in written or tangible form), except as specifically authorized
by such party. As used herein, "Confidential Information" shall mean a whole or
any portion or phase of any marketing plans, business plans, sales information,
customer lists, scientific or technical information, design, process, procedure,
formula, or improvement relating to the development, design, construction, and
operation of a program that is valuable and not generally known to a party's
competitors and any other information of a party of which the other party
becomes aware as a result of this Agreement and which is indicated to be
confidential or, if not so indicated, which could reasonably be interpreted to
be confidential. Notwithstanding the foregoing, confidential information of any
disclosing party shall not be deemed to include (i) any information that is in
the public domain through no wrongful release by the receiving party; (ii) any
information that was independently developed by the receiving party; (iii) any
information that is disclosed to the receiving party by a third party not under
obligation to the disclosing party; or (iv) any information that was previously
known by the receiving party. The parties agree that, in the event of a breach
or threatened breach of the terms of this confidentiality provision, the
non-breaching party shall be entitled to an injunction prohibiting any such
breach. Any such relief shall be in addition to and not in lieu of any
appropriate relief in the way of money damages. The parties acknowledge that
Confidential Information is valuable and unique and that disclosure in breach of
this confidentiality provision will result in irreparable injury to its owner.

B. RESIDUALS. Notwithstanding anything herein to the contrary, either party may
use Residuals for any purpose, including use in the development, manufacture,
promotion, sale and maintenance of its products and services; provided that this
right to Residuals does not represent a license under any patents, copyrights or
mask work rights of the disclosing party. The term "Residuals" means information
of a general nature, such as general knowledge, ideas, concepts, know-how,
professional skills, work experience or techniques (not specifics such as exact
implementations) that is retained in the unaided memories of the receiving
party's employees who have had access to the disclosing party's information
pursuant to the terms of this Agreement. An employee's memory is unaided if the
employee has not intentionally memorized the Information for the purpose of
retaining and subsequently using or disclosing it. Nothing in this Agreement
shall prevent either party from developing products that are competitive with
the other and both parties recognize that they are in the business of developing
compression/decompression software which may be competitive.

XII. GENERAL PROVISIONS

A. ASSIGNMENTS AND CHANGE OF CONTROL. On2 may not assign, transfer, or otherwise
dispose of this Agreement, or any rights or obligations hereunder, without
Real's prior written consent, including pursuant to a "Change of Control" which
will not be unreasonably withheld. This Agreement shall be binding upon and
inure to the benefit of the parties, their successors and permitted assigns.

                                       8
<Page>

B. NOTICE. All notices and demands under this Agreement will be in writing and
will be delivered by personal service, express courier, or first class mail, to
the following addresses:

                If to Real:      RealNetworks, Inc.
                                 2601 Elliott Avenue, Suite 1000
                                 Seattle, WA 98121
                                 Attention:  General Counsel

                with a copy to:  RealNetworks, Inc.
                                 2601 Elliott Avenue, Suite 1000
                                 Seattle, WA 98121
                                 Attention: Senior Vice President, Media Systems

                If to On2:       On2 Technologies, Inc.
                                 145 Hudson Street
                                 New York, NY 10013
                                 Attn: General Counsel

                with a copy to:  On2 Technologies, Inc.
                                 145 Hudson Street
                                 New York, NY 10013
                                 Attn: Douglas McIntyre

         Either party may change the addresses set forth above by written notice
         to the other party. Notice will be effective on receipt or within one
         day of sending if notice is provided by Federal Express, Airborne
         Express or other major overnight courier.

C. INDEPENDENT CONTRACTORS. Real and On2 are independent contractors in all
relationships and actions under and contemplated by the Agreement.
Notwithstanding anything in this Agreement to the contrary, the parties do not
by this Agreement intend to form, nor shall this Agreement be construed to
constitute, a partnership, joint venture, employment, or agency relationship
between them, or to authorize either party to enter into any commitment or
agreement binding on the other or to allow one party to accept service of any
legal process addressed to, or intended for, the other party.

D. MISCELLANEOUS. This Agreement (together with the exhibits attached hereto,
which are incorporated herein by this reference) constitutes the final agreement
between the parties regarding the subject matter set forth herein, and
supersedes and cancels all prior negotiations, understandings, correspondence
and agreements, oral and written, express or implied, between the parties
relating to the subject matter hereof (including, without limitation, the
Previous Agreement), and thereof, and shall be binding only when executed by
both parties hereto. The Parties recognize that any Stock Purchase Agreement,
Warrant Exercise Agreement and Investor Rights Agreement entered into by the
Parties is not superceded by this Agreement. No waiver, amendment or
modification of any provision of this Agreement shall be effective unless it is
in a document that expressly refers to this Agreement and is signed by both
parties. Failure or delay by either party in exercising any rights or remedy
under this Agreement shall not operate as a waiver of any such right or remedy.
If any provision of this Agreement shall be held by a court of competent
jurisdiction to be illegal, invalid or unenforceable, the legality, validity and
enforceability of the remaining provisions shall not, in any way, be affected or
impaired thereby. The titles and headings of each section are intended for
convenience only and shall not be used in

                                       9
<Page>

construing or interpreting the meaning of any particular clause or section. This
Agreement shall be governed by the laws of the State of Washington, excluding
that body of law known as conflicts of law.

E. SEVERABILITY. If any one or more of the provisions contained in this
Agreement is invalid, illegal or unenforceable in any respect in any
jurisdiction, the validity, legality and enforceability of such provision or
provisions shall not, in any way, be affected or impaired thereby in any other
jurisdiction and the validity and enforceability of the remaining provisions
contained herein shall not, in any way, be affected or impaired thereby.

F. EXPORT CONTROLS. The use and disclosure of the software and the exercise of
all rights granted by this Agreement shall be subject to the technology
transfer, export, assets and financial control regulations of the United States
of America and any applicable foreign governments or governmental bodies,
including, without limitation, restrictions under regulations of the United
States that may be applicable to direct or indirect exportation or
re-exportation of such technical information or of equipment products or
services directly produced by use of such technical information. Both parties
shall comply fully with any and all such applicable laws, rules and regulations
and shall protect the full value of the intellectual property rights which are
the subject of this Agreement.

G. PRESS RELEASE. Neither party will make any public statement or issue any
press release regarding the existence or the terms and conditions in this
Agreement without the prior written consent of the other. Neither party will
unreasonably withhold consent. Nothing in this section shall prevent either
party from making disclosures required by law, but such disclosure will be
provided to the other party prior to disclosure for consultation.

                            [Signature Page Follows]

                                       10
<Page>

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly
executed by their respective authorized officer as of this 18th day of July,
2001.

                                        ON2 TECHNOLOGIES, INC.

                                        By:
                                           -------------------------------------
                                        Name:
                                        Title:

                                        REALNETWORKS, INC.

                                        By:
                                           -------------------------------------
                                        Name:
                                        Title:

                                       11

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00029-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00029-of-00352.parquet"}]]