Document:

EXHIBIT
          4.3

      

       

      REGISTRATION
        RIGHTS AGREEMENT

       

      This
        Registration Rights Agreement (the
        "Agreement") is entered into as of the 30th
        day of June, 2005, by and among IsoRay
        Medical, Inc.,
        a Delaware corporation (the "Corporation"), Century
        Park Pictures Corporation,
        a Minnesota corporation (“Century Park”), and each of the Corporation's
        debenture holders and each of Century Park’s shareholders who is a signatory
        hereto (collectively, the "Signing Security Holders") .

       

      Recitals

       

      Whereas,
        the Corporation desires to raise between $2,000,000 and $4,000,000 in the
        form
        of convertible debentures to fund its working capital requirements.

       

      Whereas,
        the Corporation has agreed to provide certain demand and piggyback registration
        rights to the investors who purchase the convertible debentures placed by
        the
        placement agents to be retained by the Corporation or sold by officers of
        the
        Corporation. 

       

      Whereas,
        on
        May 27, 2005 the Corporation, Century Park and Century Park Transitory
        Subsidiary, Inc. entered into a merger agreement (the “Agreement”), which, if
        consummated, would result in the Corporation’s debentures being convertible into
        shares of common stock of Century Park. 

       

      Whereas,
        it
        is a condition to the merger (the “Merger”) contemplated by the Agreement that
        certain shareholders of Century Park be granted certain demand and piggyback
        registration rights by the post-merger surviving company. 

       

      Now,
        Therefore, in
        consideration of the foregoing and the mutual promises contained herein,
        and for
        other good and valuable consideration, the receipt and sufficiency of which
        are
        hereby acknowledged, the parties hereto agree as follows:

       

      SECTION
        1.  GENERAL.

       

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

       

      "Board"
        shall mean the board of directors of the Company. 

       

      “Century
        Park Shares” shall mean those certain shares of Century Park’s common stock held
        by the signatories hereto that are shareholders of Century Park. 

       

      "Common
        Stock" or "Shares" shall mean the Company's Common Stock, or any other class
        of
        stock exchanged for Common Stock of the Company. 

       

      “Company”
        shall mean the Corporation prior to the closing of the Merger, and Century
        Park
        following the closing of the Merger. 

       

      
        
           

        

        
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      "Conversion
        Shares" shall mean those certain shares of Common Stock issued upon conversion
        of the convertible debentures placed by the placement agents to be retained
        by
        the Corporation or sold by officers of the Corporation. 

       

      “Debenture
        Holders” means these persons holding the Corporation’s convertible debentures
        who are signatories to this Agreement. 

       

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

       

      "GAAP"
        shall mean those generally accepted accounting principles and practices which
        are recognized by the American Institute of Certified Public Accountants
        and
        which are consistently applied for all periods so as to properly reflect
        the
        financial condition, and the results of operations and changes in financial
        position, of the Company.

       

      "Holder"
        means any person or entity owning of record Registrable Securities that have
        not
        been sold to the public or any assignee of record of such Registrable Securities
        in accordance with Section 2.7 hereof.

       

      "Register,"
        "registered," and "registration" refer to a registration effected by preparing
        and filing a registration statement in compliance with the Securities Act,
        and
        the declaration or ordering of effectiveness of such registration statement
        or
        document.

       

      "Registrable
        Securities" means (a) the Conversion Shares; (b) the Century Park
        Shares
        (solely if the Merger is consummated); and (c) any Common Stock of the
        Corporation or, if the Merger is consummated, of Century Park, issued as
        (or
        issuable upon the conversion or exercise of any warrant, right or other security
        which is issued as) a dividend or other distribution with respect to, or
        in
        exchange for or in replacement of, such above-described securities.
        Notwithstanding the foregoing, Registrable Securities shall not include any
        securities sold by a person or entity to the public either pursuant to a
        registration statement or Rule 144 or sold in a private transaction
        in
        which the transferor's rights under Section 2 of this Agreement are
        not
        assigned.

       

      "Registrable
        Securities then outstanding" shall be the number of shares determined by
        calculating the total number of shares of Common Stock that are Registrable
        Securities and either (a) are then issued and outstanding or (b) are
        issuable pursuant to then exercisable or convertible securities.

       

      "Registration
        Expenses" shall mean all expenses incurred by the Company in complying with
        Sections 2.1 and 2.2 hereof, including, without limitation, all
        registration and filing fees, printing expenses, fees and disbursements of
        counsel for the Company, reasonable fees and disbursements of special counsel
        for the Holders, blue sky fees and expenses and the expense of any special
        audits incident to or required by any such registration (but excluding the
        compensation of regular employees of the Company which shall be paid in any
        event by the Company).

       

      "SEC"
        or "Commission" means the Securities and Exchange Commission.

       

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

       

      
        
           

        

        
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      "Selling
        Expenses" shall mean all underwriting discounts and selling commissions
        applicable to the sale of the Company's capital stock.

       

      "Shareholders"
        shall mean all of the holders of the Company’s capital stock.

       

      "Special
        Registration Statement" shall mean a registration statement relating to any
        employee benefit plan or with respect to any corporate reorganization or
        other
        transaction under Rule 145 of the Securities Act.

       

      "Termination
        Date" shall mean twenty-four (24) months after the conclusion of the “Offering
        Period,” as such term is defined in the Corporation’s Confidential Private
        Placement Memorandum dated January 31, 2005, as amended and restated on May
        27,
        2005. 

       

      SECTION
        2.  PIGGYBACK
        REGISTRATION.

       

      2.1  Piggyback
        Registration.  The
        Company shall promptly notify all Holders of Registrable Securities in writing
        of any proposed filing of any registration statement under the Securities
        Act
        for purposes of a public offering of securities of the Company (including,
        but
        not limited to, registration statements relating to secondary offerings of
        securities of the Company, but excluding Special Registration Statements),
        which
        notice shall be made at least forty-five (45) days prior to such filing,
        and
        will afford each such Holder an opportunity to include in such registration
        statement all or part of the Registrable Securities held by such Holder.
        Each
        Holder desiring to include in any such registration statement all or any
        part of
        the Registrable Securities held by it shall, within twenty (20) days after
        receipt of the above-described notice from the Company, so notify the Company
        in
        writing. Such notice shall state the intended method of disposition of the
        Registrable Securities by such Holder. If a Holder decides not to include
        all of
        its Registrable Securities in any registration statement thereafter filed
        by the
        Company, such Holder shall forfeit all future right to include any Registrable
        Securities in any subsequent registration statement or registration statements
        as may be filed by the Company with respect to offerings of its securities.
        

       

      (a)  Underwriting.  If
        the registration statement under which the Company gives notice under this
        Section 2.1 is for an underwritten offering, the Company shall so
        advise
        the Holders of Registrable Securities. In such event, the right of any such
        Holder to be included in a registration pursuant to this Section 2.1
        shall
        be conditioned upon such Holder's participation in such underwriting and
        the
        inclusion of such Holder's Registrable Securities in the underwriting to
        the
        extent provided herein. All Holders proposing to distribute their Registrable
        Securities through such underwriting shall enter into an underwriting agreement
        in customary form with the underwriter or underwriters selected for such
        underwriting by the Company. Notwithstanding any other provision of this
        Agreement, if the underwriter determines in good faith that marketing factors
        require a limitation of the number of shares to be underwritten, the number
        of
        shares that may be included in the underwriting shall be allocated, first,
        to
        the Company; and second, to the Holders; and thereafter to any other
        Shareholders of the Company holding registration rights. If any Holder
        disapproves of the terms of any such underwriting, such Holder may elect
        to
        withdraw therefrom by written notice to the Company and the underwriter,
        delivered on or before the later of (i) five (5) business days after
        the
        receipt by all Holders of the underwriting agreement containing the terms
        thereof and (ii) ten (10) business days prior to the effective date
        of the
        registration statement. Any Registrable Securities excluded or withdrawn
        from
        such underwriting shall be excluded and withdrawn from the registration.
        For any
        Holder which is a partnership, limited liability company or corporation,
        the
        partners, retired partners, managers, members and shareholders of such Holder,
        or the estates and family members of any such partners and retired partners
        and
        any trusts for the benefit of any of the foregoing shall be deemed to be
        a
        single "Holder," and any pro
        rata
        reduction with respect to such "Holder" shall be based upon the aggregate
        amount
        of shares of Company capital stock carrying registration rights owned by
        all
        entities and individuals included in such “Holder,” as defined in this
        sentence.

       

      
        
           

        

        
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      (b)  Right
        to Terminate Registration. The
        Company shall have the right to terminate or withdraw any registration initiated
        by it under this Section 2.1 prior to the effectiveness of such
        registration whether or not any Holder has elected to include securities
        in such
        registration. The Registration Expenses of such withdrawn registration shall
        be
        borne by the Company in accordance with Section 2.3 hereof. 

       

      2.2  Demand
        Registration. At
        any time on or before November 1, 2005, Holders
        shall have a "onetime" demand right to make a written request ("Demand Request")
        that the Company register the Registrable Securities, provided that if the
        Merger is not consummated by August 1, 2005, all demand rights will be forfeited
        by all Holders. Within thirty (30) days after receipt of Demand Requests
        from
        Holders of at least a majority of the Registrable Securities, the Company
        shall
        prepare and file under the Act, one registration statement to permit a public
        offering of all of the Registrable Securities which shall include all Conversion
        Shares, including those issuable to Debenture Holders ("Demand Registration").
        Notwithstanding the rights granted in this Section 2.2, if a Debenture Holder
        has not elected to convert all or any part of his debentures on or before
        December 31, 2005 (by delivering the conversion form to the Company via
        facsimile by that date or mailing the conversion form to the Company with
        a
        postmark by that date), then the demand right granted by this Section 2.2
        shall
        be forfeited in full regardless of whether Conversion Shares have been included
        in the Demand Registration. 

       

      2.3  Expenses
        of Registration.  Except
        as specifically provided herein, all Registration Expenses incurred in
        connection with any registration pursuant to Sections 2.1 and 2.2 herein
        shall
        be borne by the Company. All Selling Expenses incurred in connection with
        any
        registrations hereunder shall be borne by the holders of the securities so
        registered pro
        rata
        on the basis of the number of Shares so registered. 

       

      2.4  Obligations
        of the Company.  Whenever
        required to effect the registration of any Registrable Securities, the Company
        shall, as expeditiously as reasonably possible (and, with respect to any
        registration statement required to be filed pursuant to Section 2.2, in any
        event within thirty (30) days): 

       

      (a)  With
        respect to any registration statement required to be filed under
        Section 2.2, prepare and file with the SEC a registration statement
        with
        respect to such Registrable Securities and use all reasonable efforts to
        cause
        such registration statement to become effective, and, upon the request of
        the
        Holders of a majority of the Registrable Securities registered thereunder,
        keep
        such registration statement effective for up to two (2) years or, if earlier,
        until the Holders have completed the distribution related thereto.

       

      
        
           

        

        
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      (b)  Prepare
        and file with the SEC such amendments and supplements to such registration
        statement and the prospectus used in connection with such registration statement
        as may be necessary to comply with the provisions of the Securities Act with
        respect to the disposition of all securities covered by such registration
        statement for the period set forth in paragraph (a) above.

       

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

       

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

       

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

       

      (f)  Notify
        each Holder of Registrable Securities covered by such registration statement
        at
        any time when a prospectus relating thereto is required to be delivered under
        the Securities Act of the happening of any event as a result of which the
        prospectus included in such registration statement, as then in effect, includes
        an untrue statement of a material fact or omits to state a material fact
        required to be stated therein or necessary to make the statements therein
        not
        misleading in the light of the circumstances then existing. The Company will
        use
        reasonable efforts to amend or supplement such prospectus in order to cause
        such
        prospectus not to include any untrue statement of a material fact or omit
        to
        state a material fact required to be stated therein or necessary to make
        the
        statements therein not misleading in the light of the circumstances then
        existing.

       

      (g)  Use
        its reasonable efforts to furnish, on the date that such Registrable Securities
        are delivered to the underwriters for sale, if such securities are being
        sold
        through underwriters, (i) an opinion, dated as of such date, of the
        counsel
        representing the Company for the purposes of such registration, in form and
        substance as is customarily given to underwriters in an underwritten public
        offering, addressed to the underwriters, if any, and (ii) a letter
        dated as
        of such date, from the independent certified public accountants of the Company,
        in form and substance as is customarily given by independent certified public
        accountants to underwriters in an underwritten public offering addressed
        to the
        underwriters.

       

      
        
           

        

        
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      2.5  Furnishing
        Information.  It
        shall
        be a condition precedent to the obligations of the Company to take any action
        pursuant to Sections 2.1 and 2.2 that the selling Holders shall furnish
        to
        the Company such information regarding themselves and warrant the accuracy
        thereof, the Registrable Securities held by them and the intended method
        of
        disposition of such securities as shall be required to effect the registration
        of their Registrable Securities.

       

      2.6  Indemnification.  In
        the event any Registrable Securities are included in a registration statement
        under Sections 2.1 and 2.2:

       

      (a)  To
        the extent permitted by law, the Company will indemnify and hold harmless
        each
        Holder, the partners, officers and directors of each Holder, any underwriter
        (as
        defined in the Securities Act) for such Holder and each person, if any, who
        controls such Holder or underwriter within the meaning of the Securities
        Act or
        the Exchange Act, against any losses, claims, damages, or liabilities (joint
        or
        several) to which they may become subject under the Securities Act, the Exchange
        Act or other federal or state law, insofar as such losses, claims, damages
        or
        liabilities (or actions in respect thereof) arise out of or are based upon
        any
        of the following statements, omissions or violations (collectively a
        "Violation") by the Company: (i) any untrue statement or alleged untrue
        statement of a material fact contained in such registration statement, including
        any preliminary prospectus or final prospectus contained therein or any
        amendments or supplements thereto, (ii) the omission or alleged omission
        to
        state therein a material fact required to be stated therein, or necessary
        to
        make the statements therein not misleading, or (iii) any violation
        or
        alleged violation by the Company of the Securities Act, the Exchange Act,
        any
        state securities law or any rule or regulation promulgated under the Securities
        Act, the Exchange Act or any state securities law in connection with the
        offering covered by such registration statement; and the Company will pay
        as
        incurred to each such Holder, partner, officer, director, underwriter or
        controlling person for any legal or other expenses reasonably incurred by
        them
        in connection with investigating or defending any such loss, claim, damage,
        liability or action; provided
        however,
        that the indemnity agreement contained in this Section 2.6(a) shall
        not
        apply to amounts paid in settlement of any such loss, claim, damage, liability
        or action if such settlement is effected without the consent of the Company,
        which consent shall not be unreasonably withheld, nor shall the Company be
        liable in any such case for any such loss, claim, damage, liability or action
        to
        the extent that it arises out of or is based upon a Violation which occurs
        in
        reliance upon and in conformity with written information furnished expressly
        for
        use in connection with such registration by such Holder, partner, officer,
        director, underwriter or controlling person of such Holder.

       

      (b)  To
        the extent permitted by law, each Holder will, if Registrable Securities
        held by
        such Holder are included in the securities as to which such registration
        qualifications or compliance is being effected, indemnify and hold harmless
        the
        Company, each of its directors, its officers and each person, if any, who
        controls the Company within the meaning of the Securities Act, any underwriter
        and any other Holder selling securities under such registration statement
        or any
        of such other Holder's partners, directors or officers or any person who
        controls such Holder, against any losses, claims, damages or liabilities
        (joint
        or several) to which the Company or any such director, officer, controlling
        person, underwriter or other such Holder, or partner, director, officer or
        controlling person of such other Holder may become subject under the Securities
        Act, the Exchange Act or other federal or state law, insofar as such losses,
        claims, damages or liabilities (or actions in respect thereto) arise out
        of or
        are based upon any Violation, in each case to the extent (and only to the
        extent) that such Violation occurs in reliance upon and in conformity with
        written information furnished by such Holder under an instrument duly executed
        by such Holder and stated to be specifically for use in connection with such
        registration; and each such Holder will pay as incurred any legal or other
        expenses reasonably incurred by the Company or any such director, officer,
        controlling person, underwriter or other Holder, or partner, officer, director
        or controlling person of such other Holder in connection with investigating
        or
        defending any such loss, claim, damage, liability or action if it is judicially
        determined that there was such a Violation; provided,
        however,
        that the indemnity agreement contained in this Section 2.6(b) shall
        not
        apply to amounts paid in settlement of any such loss, claim, damage, liability
        or action if such settlement is effected without the consent of the Holder,
        which consent shall not be unreasonably withheld; provided
        further,
        that in no event shall any indemnity under this Section 2.6 exceed
        the net
        proceeds from the offering received by such Holder.

       

      
        
           

        

        
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      (c)  Promptly
        after receipt by an indemnified party under this Section 2.6 of notice
        of
        the commencement of any action (including any governmental action), such
        indemnified party will, if a claim in respect thereof is to be made against
        any
        indemnifying party under this Section 2.6, deliver to the indemnifying
        party a written notice of the commencement thereof and the indemnifying party
        shall have the right to participate in, and, to the extent the indemnifying
        party so desires, jointly with any other indemnifying party similarly noticed,
        to assume the defense thereof with counsel mutually satisfactory to the parties;
        provided,
        however,
        that an indemnified party shall have the right to retain its own counsel,
        with
        the fees and expenses to be paid by the indemnifying party, if representation
        of
        such indemnified party by the counsel retained by the indemnifying party
        would
        be inappropriate due to actual or potential differing interests between such
        indemnified party and any other party represented by such counsel in such
        proceeding. The failure to deliver written notice to the indemnifying party
        within a reasonable time of the commencement of any such action, if materially
        prejudicial to its ability to defend such action, shall relieve such
        indemnifying party of any liability to the indemnified party under this
        Section 2.6, but the omission so to deliver written notice to the
        indemnifying party will not relieve it of any liability that it may have
        to any
        indemnified party otherwise than under this Section 2.6.

       

      (d)  If
        the indemnification provided for in this Section 2.6 is held by a
        court of
        competent jurisdiction to be unavailable to an indemnified party with respect
        to
        any losses, claims, damages or liabilities referred to herein, the indemnifying
        party, in lieu of indemnifying such indemnified party thereunder, shall to
        the
        extent permitted by applicable law contribute to the amount paid or payable
        by
        such indemnified party as a result of such loss, claim, damage or liability
        in
        such proportion as is appropriate to reflect the relative fault of the
        indemnifying party on the one hand and of the indemnified party on the other
        in
        connection with the Violation(s) that resulted in such loss, claim, damage
        or
        liability, as well as any other relevant equitable considerations. The relative
        fault of the indemnifying party and of the indemnified party shall be determined
        by a court of law by reference to, among other things, whether the untrue
        or
        alleged untrue statement of a material fact or the omission to state a material
        fact relates to information supplied by the indemnifying party or by the
        indemnified party and the parties' relative intent, knowledge, access to
        information and opportunity to correct or prevent such statement or omission;
        provided,
        that in no event shall any contribution by a Holder hereunder exceed the
        net
        proceeds from the offering received by such Holder.

       

      (e)  The
        obligations of the Company and Holders under this Section 2.6 shall
        survive
        completion of any offering of Registrable Securities in a registration statement
        and the termination of this agreement. No Indemnifying Party, in the defense
        of
        any such claim or litigation, shall, except with the consent of each Indemnified
        Party, consent to entry of any judgment or enter into any settlement which
        does
        not include as an unconditional term thereof the giving by the claimant or
        plaintiff to such Indemnified Party of a release from all liability in respect
        to such claim or litigation.

       

      
        
           

        

        
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      2.7  Assignment
        of Registration Rights.  The
        registration rights of the Holders under this Agreement may be transferred
        to
        any transferee if the Company is given written notice by the Holder at the
        time
        of such transfer stating the name and address of the transferee and identifying
        the securities with respect to which the rights under this Agreement are
        being
        assigned.

       

      2.8  Amendment
        of Registration Rights.  Any
        provision of this Section 2 may be amended and the observance thereof
        may
        be waived (either generally or in a particular instance and either retroactively
        or prospectively), only with the written consent of the Company and the Holders
        of at least a majority of the Registrable Securities then outstanding. Any
        amendment or waiver effected in accordance with this Section 2.8 shall
        be
        binding upon each Holder and the Company. By acceptance of any benefits under
        this Section 2, Holders of Registrable Securities hereby agree to
        be bound
        by the provisions hereunder.

       

      2.9  Rule
        144 Reporting.  With
        a view to making available to the Holders the benefits of certain rules and
        regulations of the SEC which may permit the sale of the Registrable Securities
        to the public without registration, the Company agrees to use its best efforts
        to:

       

      (a)  Make
        and keep public information available, as those terms are understood and
        defined
        in SEC Rule 144 or any similar or analogous rule promulgated under
        the
        Securities Act, at all times after the effective date of the first registration
        filed by the Company for an offering of its securities to the general
        public;

       

      (b)  File
        with the SEC, in a timely manner, all reports and other documents required
        of
        the Company under the Exchange Act; and

       

      (c)  So
        long as a Holder owns any Registrable Securities, furnish to such Holder
        forthwith upon request: a written statement by the Company as to its compliance
        with the reporting requirements of said Rule 144 of the Securities Act, and
        of
        the Exchange Act (at any time after it has become subject to such reporting
        requirements); a copy of the most recent annual or quarterly report of the
        Company; and such other reports and documents as a Holder may reasonably
        request
        in availing itself of any rule or regulation of the SEC allowing it to sell
        any
        such securities without registration.

       

      
        
           

        

        
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      SECTION
        3.  MISCELLANEOUS.

       

      3.1  Governing
        Law.  This
        Agreement and
        the
        rights and obligations of the parties hereto, shall be governed, construed
        and
        interpreted according to the laws of the State of Delaware. The parties agree
        that any final judgment after exhaustion of all appeals or the expiration
        of
        time to appeal in any such action or proceeding shall be conclusive and binding,
        and may be enforced in any federal or state court in the United States by
        suit
        on the judgment or in any other manner provided by law. Nothing contained
        in
        this Agreement shall affect or limit the right of a party to serve any process
        or notice or motion or other application in any other manner permitted by
        law,
        or limit or affect the right of a party to bring any action or proceeding
        against the other parties or any of their respective property in the courts
        of
        any other jurisdiction. All parties hereby consent to the jurisdiction of
        the
        federal courts whose districts encompass any part of the city of Phoenix
        or the
        state courts of the state of Arizona sitting in the city of Phoenix in
        connection with any dispute arising under this Agreement, and hereby waive,
        to
        the maximum extent permitted by law, any objection, including any objections
        based on forum non
        conveniens, to
        the
        bringing of any such proceeding in such jurisdictions.

       

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

       

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

       

      3.4  Amendment
        and Waiver.

       

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

       

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

       

      
        
           

        

        
          9

          
            

          

        

        
           

        

         

      

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

       

      3.6  Notices.
        All
        notices required or permitted hereunder shall be in writing and shall be
        deemed
        effectively given: (a) upon personal delivery to the party to be notified,
        (b) three (3) days after having been sent by registered or certified
        mail,
        return receipt requested, postage prepaid, or (c) one (1) day after
        deposit
        with a nationally recognized overnight courier, specifying next day delivery,
        with written verification of receipt. All communications shall be sent to
        the
        party to be notified at the address as set forth on either the signature
        pages
        hereof or at such other address as such party may designate by ten (10) days
        advance written notice to the other parties hereto. 

       

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

       

      3.8  Construction.
        The
        terms of this Agreement constitute the written expression of the mutual
        agreement of the parties and shall be construed neutrally and not for or
        against
        either party. Whenever a noun or pronoun is used in this Agreement in the
        singular and when required by the context, the same shall include the plural,
        and the masculine gender shall include the feminine and neuter genders and
        vice
        versa. As used in this Agreement, the term "party" or "parties" shall mean
        the
        parties to this Agreement. The term "person" shall include any individual,
        entity, trust or association. The headings in this Agreement are inserted
        for
        convenience; the provisions of this Agreement shall control in determining
        the
        intent hereof.

       

      3.9  Enforcement;
        Specific Performance; Remedies Cumulative. 

       

      (a)  In
        case
        any one or more defaults shall occur and be continuing, a party may proceed
        to
        protect and enforce its rights by an action at law, suit in equity or other
        appropriate proceeding, whether for the specific performance of any agreement
        contained herein or for an injunction against a violation of any of the terms
        hereof or thereof, or in aid of the exercise of any power granted hereby
        or
        thereby or by law.

       

      (b)  The
        parties expressly agree that each party may not have adequate remedies at
        law if
        the other parties do not perform its obligations under this Agreement. Upon
        a
        party's breach of the terms or covenants of this Agreement, the other parties
        shall, each in addition to all other remedies, be entitled to obtain injunctive
        relief, and an order for specific performance of the breaching party's
        obligations hereunder. 

       

      
        
           

        

        
          10

          
            

          

        

        
           

        

         

      

      3.10  Other
        Registration Rights.
        Each
        signing Security Holder understands and acknowledges that certain shareholders
        of the Corporation who purchased common stock at $2.00 per share as part
        of the
        Corporation’s private offering in the Fall of 2004 have piggyback registration
        rights that will be triggered by the Holders’ exercise of their demand right
        pursuant to this Agreement. 

       

      3.11  Counterparts.
        This
        Agreement may be executed in any number of counterparts, each of which shall
        be
        an original, but all of which together shall constitute one
        instrument.

       

      [Signature
        page to follow]

       

      
        
           

        

        
          11

          
            

          

        

        
           

        

      

      In
        Witness Whereof, the
        parties hereto have executed this Registration
        Rights Agreement as
        of the date set forth in the first paragraph hereof.

       

      
        	
                Isoray
                  Medical, Inc 

                 

                By:
                  ___________________________

                Name: Roger
                  Girard

                Title: CEO

                 

              	
                Century
                  Park Pictures Corporation

                 

                By:
                  ___________________________

                Name:
                  Thomas
                  Scallen

                Title:
                  CEO

              
	
                Address:   
                  350
                  Hills Street, 

                Suite
                  106

                Richland,
                  WA 99354

              	
                Address:  
                     4701
                  IDS Center

                Minneapolis,
                  MN 55402

                 

              
	 	 
	
                Security
                  holders

                 

                 

                By:__________________________ 

                Name:
                  

                Address:__________________________

                       
                          __________________________

                 

                By:__________________________

                Name:
                  

                Address:__________________________

                        __________________________

                 

                By:__________________________

                Name:
                  

                Address:__________________________

                        __________________________

                 

                By:__________________________

                Name:
                  

                Address:__________________________

                        __________________________

                 

                 

                By:__________________________

                Name:
                  

                Address:__________________________

                        __________________________

              	
                Security
                  holders

                 

                 

                By:__________________________ 

                Name:
                  

                Address:__________________________

                        __________________________

                 

                By: 

                Name:
                  

                Address:__________________________

                        __________________________

                 

                By:__________________________

                Name:
                  

                Address:__________________________

                        __________________________

                 

                By:__________________________

                Name:
                  

                Address:__________________________

                        __________________________

                 

                 

                By:__________________________

                Name:
                  

                Address:__________________________

                        __________________________

                 

              

      

      

      
        
           

        

        
          12Unassociated Document

    

      EXHIBIT
        4.4

    

    

    ESCROW
      AGREEMENT

     

    This
      Escrow Agreement
      is
      entered into as of June 30, 2005, by and among Century
      Park Pictures Corp.,
      a
      Minnesota corporation (“Parent”);
      IsoRay Medical, Inc.,
      a
      Delaware corporation (referred to herein interchangeably as the “Company”
      and the
“Escrow
      Agent”);
      and
Anthony
      Silverman,
      an
      individual (the “Stockholder”).

     

    Recitals

     

    A.   Parent,
      Century Park Transitory Subsidiary, Inc., a Delaware corporation and wholly
      owned subsidiary of Parent (the “Merger
      Sub”),
      the Company, the Stockholder and
      Thomas
      Scallen
      have entered into an Agreement and Plan of Merger dated as of May 27, 2005
      (the
“Merger
      Agreement”)
      pursuant to which the Company will be merged with and into Merger Sub whereby
      the Company will cease to exist, and Merger Sub will be the surviving
      corporation (the “Merger”).

     

    B.   The
      Merger Agreement provides that an escrow account will be established as
      collateral for certain possible indemnification obligations to the Company
      and
      its officers, directors and affiliates (the “Indemnitiees”)
      by the Stockholder that may arise under the Merger Agreement. 

     

    C.   This
      Agreement will become effective automatically upon the closing of the
      Merger.

     

    D.   The
      parties hereto desire to establish the terms and conditions pursuant to which
      such escrow account will be established and maintained.

     

    Agreement

     

    Now,
      Therefore,
      the
      parties hereby agree as follows:

     

    1.  Defined
      Terms. Capitalized
      terms used in this Agreement and not otherwise defined shall have the meanings
      given them in the Merger Agreement.

     

    2.  Escrow
      Account.

     

    (a)  Escrow
      of Parent Shares.
      On the
      Effective Date, Stockholder shall deliver to the Escrow Agent 50,000 shares
      (post 30:1 reverse stock split) of Parent common stock (the “Escrow
      Shares”).
      The
      Escrow Shares will be represented by a certificate or certificates issued in
      the
      name of the Escrow Agent or its nominee. The Escrow Shares shall be held as
      a
      trust fund and shall not be subject to any lien, attachment, trustee process
      or
      any other judicial process of any creditor of any party hereto. The Escrow
      Agent
      agrees to accept delivery of the Escrow Shares and to hold the Escrow Shares
      (as
      well as any dividends or other amounts paid on such account pursuant to Section
      2(b)) in an escrow account (the “Escrow
      Account”)
      subject
      to the terms and conditions of this Agreement. Upon delivery, the Escrow Agent
      will issue a written receipt for the Escrow Shares to the
      Stockholder.

     

    
      
        
        

      

      
        1

        
          

        

      

      
        
        

      

       

    

    (b)  Dividends,
      Etc. Any
      securities distributable in respect of or in exchange for any of the Escrow
      Shares, whether by way of stock dividend, stock splits or otherwise, shall
      be
      delivered to the Escrow Agent, who shall hold such securities in the Escrow
      Account. Such securities shall be issued in the name of the Escrow Agent or
      its
      nominee and shall be considered Escrow Shares for all purposes hereof. Any
      cash
      dividend or property (other than securities) distributable to the Stockholder
      in
      respect of the Escrow Shares shall be delivered to the Stockholder, and shall
      not become part of the Escrow Account.

     

    (c)  Voting
      of Shares. On
      any
      matter brought before the Stockholders of Parent for a vote, the Escrow Agent
      shall deliver to the Stockholder a notice of such vote promptly upon receiving
      a
      proxy or other materials regarding such vote and the Stockholder shall deliver
      notice to the Escrow Agent (the “Voting
      Notice”)
      setting
      forth the manner in which the Escrow Agent shall vote the Escrow Shares. The
      Stockholder shall deliver such Voting Notice to the Escrow Agent at least five
      business days prior to the date of the taking of any vote of the stockholders
      of
      Parent (the “Voting
      Notice Date”).
      The
      Escrow Agent shall have no obligation to vote any of the Escrow Shares if no
      Voting Notice is received prior to the Voting Notice Date or if such notice
      does
      not clearly set forth the manner in which the Escrow Agent shall vote the Escrow
      Shares.

     

    (d)  Transferability.
      The
      interest of the Stockholder in the Escrow Account shall not be assignable or
      transferable by the Stockholder. The interest of Parent in the Escrow Account
      shall be assignable or transferable by Parent in connection with a merger,
      sale
      of substantially all of its assets or other business combination involving
      Parent.

     

    (e)  Escrow
      Agent’s Power to Transfer.
      The
      Escrow Agent is hereby granted the power to effect any transfer of all or a
      part
      of the Escrow Account permitted under the terms of this Agreement.

     

    3.  Administration
      of Escrow Account.
      The
      Escrow Agent shall administer the Escrow Account as follows:

     

    (a)  Delivery
      of Claim Notice.
      If any
      Indemnitee has incurred or suffered any Damages for which it is or may be
      entitled to indemnification under the Merger Agreement, the Parent shall, on
      behalf of such Indemnitee and on or prior to the Termination Date (as defined
      below), give written notice of such claim (a “Claim
      Notice”)
      to the
      Stockholder and the Escrow Agent. Each Claim Notice shall state the basis for
      such claim and the amount of Damages incurred or suffered by such Indemnitee
      (the “Claimed Amount”)
      and
      delivery instructions for the Claimed Amount. No Indemnitee shall make any
      claim
      for Damages after 11:59 p.m. (Washington Time) on the date that is three years
      after the Closing Date (such date being referred to herein as the “Termination
      Date”).

     

    (b)  Response
      Notice. Within
      15
      business days of the date a Claim Notice was sent to the Stockholder and the
      Escrow Agent (the “Response
      Date”),
      the
      Stockholder shall provide to Parent and to the Escrow Agent a written response
      (the “Response
      Notice”)
      in
      which the Stockholder shall: (i) agree that the full Claimed Amount may be
      released from the Escrow Account to the Indemnitee, (ii) agree that part, but
      not all of the Claimed Amount (the “Agreed
      Amount”)
      may be
      released from the Escrow Account to the Indemnitee or (iii) contest that any
      of
      the Claimed Amount may be released from the Escrow Account to the Indemnitee.
      The Stockholder may contest the release of all or a portion of a Claimed Amount
      only based upon a good faith belief that all or such portion of the Claimed
      Amount does not constitute Damages for which the Indemnitee is entitled to
      indemnification under the Merger Agreement. If no Response Notice is delivered
      by the Stockholder to the Escrow Agent by the Response Date, the Stockholder
      shall be deemed to have agreed that the entire Claimed Amount may be released
      to
      the Indemnitee from the Escrow Account. 

     

    
      
        
        

      

      
        2

        
          

        

      

      
        
        

      

       

    

    (c)  Uncontested
      Claim.
      If the
      Stockholder in the Response Notice agrees or is deemed to have agreed that
      the
      Claimed Amount may be released from the Escrow Account to the Indemnitee, the
      Escrow Agent shall, no later than five business days after receipt of the
      Response Notice, transfer, deliver, and assign to such Indemnitee the Claimed
      Amount (or such lesser amount as is then held in the Escrow
      Account).

     

    (d)  Partially
      Contested Claims.
      If the
      Stockholder in the Response Notice agrees that part, but not all, of the Claimed
      Amount may be released from the Escrow Account to such Indemnitee, the Escrow
      Agent shall, no later than five business days after receipt of the Response
      Notice, transfer, deliver, and assign to such Indemnitee the Agreed Amount
      (or
      such lesser amount as is then held in the Escrow Account).

     

    (e)  Contested
      Claims.
      If the
      Stockholder in the Response Notice contests the release of all or part of the
      Claimed Amount (the “Contested
      Amount”),
      the
      matter shall be settled by binding arbitration held in Phoenix, Arizona. All
      claims shall be settled by three arbitrators in accordance with the Commercial
      Arbitration Rules then in effect of the American Arbitration Association (the
      “Rules”).
      The
      Stockholder and Parent shall each designate one arbitrator within 10 business
      days of the delivery of the Response Notice contesting the Claimed Amount.
      Such
      designated arbitrators shall mutually agree upon and shall designate a third
      arbitrator within 10 business days of the last to be appointed of such
      arbitrators; provided
      however,
      that (i)
      in the event the two designated arbitrators fail to reach agreement with respect
      to the designation of the third arbitrator within such 10 business day period,
      the third arbitrator shall be appointed in accordance with the Rules and (ii)
      if
      either the Stockholder or Parent fail to timely designate an arbitrator, the
      dispute shall be resolved by the one arbitrator timely designated. There shall
      be limited discovery prior to the arbitration hearing, subject to the discretion
      of the arbitrators, as follows: (a) exchange of witness lists and copies of
      documentary evidence and documents related to or arising out of the issues
      to be
      arbitrated, (b) depositions of all party witnesses, and (c) such other
      depositions as may be allowed by the arbitrators upon a showing of good cause.
      Depositions shall be conducted in accordance with the Federal Rules of Civil
      Procedure. Each party shall pay its own costs and expenses (including counsel
      fees) of any such arbitration. The Stockholder and Parent shall pay the fees
      and
      expenses of their respectively designated arbitrators and shall bear equally
      the
      fees and expenses of the third arbitrator. The arbitrators shall decide the
      matter to be arbitrated pursuant hereto within 45 business days after the
      appointment of the last arbitrator. The arbitrators’ decision shall relate
      solely to whether Parent is entitled to receive the Contested Amount (or a
      portion thereof) pursuant to the applicable terms of the Merger Agreement and
      this Agreement. The final decision of the majority of the arbitrators shall
      be
      furnished to the Stockholder, Parent and the Escrow Agent in writing and shall
      constitute a conclusive determination of the issue in question, binding upon
      the
      Stockholder, the Company, Parent and the Escrow Agent and shall not be contested
      by any of them. Such decision may be used in a court of law only for the purpose
      of seeking enforcement of the arbitrators’ award. After delivery of a Response
      Notice that the Claimed Amount is contested by the Stockholder, the Escrow
      Agent
      shall retain in the Escrow Account that portion of the Escrow Account having
      a
      value equal to one hundred percent (100%) of the Contested Amount by such number
      of Escrow Shares (with the Fair Market Value of any Escrow Shares calculated
      according to Section 6) (up to the amount then available in the Escrow Account),
      notwithstanding the occurrence of the Termination Date, until (i) delivery
      of a
      copy of a settlement agreement executed by Parent and the Stockholder setting
      forth instructions to the Escrow Agent as to release of any amounts from the
      Escrow Account, if any, that shall be made with respect to the Contested Amount,
      or (ii) delivery of a copy of the final award of the majority of the arbitrators
      setting forth instructions to the Escrow Agent as to the release of any amounts
      from the Escrow Account, if any, that shall be made with respect to the
      Contested Amount. The Escrow Agent shall thereupon release the amount, if any,
      from the Escrow Account (or such lesser amount as is then held in the Escrow
      Account) in accordance with such agreement or instructions. Each of the
      Stockholder and Parent shall use commercially reasonable efforts to fully and
      finally resolve all disputes governed by the procedures set forth in this
      Section 3(e) as expeditiously as possible. 

     

    
      
        
        

      

      
        3

        
          

        

      

      
        
        

      

       

    

    4.  Satisfaction
      of Claims. Claims
      will be satisfied, by delivery of such number of Escrow Shares having a Fair
      Market Value equal to the amount to be released from escrow. The Escrow Agent
      shall have no responsibility to perform any calculations anticipated by this
      Section 4, but will in all circumstances be directed in writing executed by
      both
      parties as to the number of Escrow Shares that are to be disbursed.

     

    5.  Release
      of Escrow Shares

     

    (a)  Within
      5
      business days after the Termination Date, Parent shall deposit with the Escrow
      Agent a certificate in the name of the Stockholder representing the number
      of
      (pursuant to Section 5(c)) shares of Parent Common Stock to which such
      stockholder is then entitled and the Escrow Agent shall, pursuant to written
      instructions provided to it by Parent and the Stockholder, distribute to the
      Stockholder, such certificates representing the Escrow Shares, if any, then
      held
      in escrow. Notwithstanding the foregoing, if any Indemnitee shall have asserted
      a claim for indemnification prior to the Termination Date and such claim has
      not
      yet been resolved, the Escrow Agent shall retain in the Escrow Account after
      the
      Termination Date that portion of the Escrow Account having a value equal to
      one
      hundred percent (100%) of the Claimed Amount or Contested Amount, as the case
      may be, by such number of Escrow Shares (with the Fair Market Value of any
      Escrow Shares calculated according to Section 6), which has not then been
      resolved, upon the terms set forth in Section 2.

     

    (b)  Any
      distribution of all or a portion of the Escrow Shares, if any, to the
      Stockholder, shall be made by mailing a stock certificate in the name of the
      Stockholder to the address of the Stockholder provided in Section 10 (or
      such
      other address as may be provided in writing to the Escrow Agent and Parent
      by
      the Stockholder). 

     

    (c)  No
      fractional Escrow Shares shall be distributed to the Stockholder pursuant to
      this Agreement. In lieu of any fractional shares to which such Stockholder
      would
      otherwise be entitled, such Stockholder shall be paid in cash an amount equal
      to
      the dollar amount (rounded to the nearest whole cent) determined by multiplying
      the Fair Market Value by the fraction of a share of Parent Common Stock that
      would otherwise be deliverable to such Stockholder hereunder. As soon as
      practicable after the Termination Date, Parent shall deposit cash in the Escrow
      Account in a sufficient amount to pay for any such fractional shares in
      accordance with this Section 5(c).

     

    
      
        
        

      

      
        4

        
          

        

      

      
        
        

      

       

    

    6.  Fair
      Market Value. For
      purposes of determining (i) the number of Escrow Shares to be either delivered
      to satisfy a claim pursuant to Section 4, or retained in the escrow account
      pursuant to Section (3)(e) or Section (5)(a), or (ii) the dollar amount paid
      to
      the Stockholder in lieu of fractional shares of Parent Common Stock pursuant
      to
      Section 5(c), “Fair
      Market Value”
      shall
      be determined as follows:

     

    (i) if
      the
      Common Stock is listed on a national securities exchange, the closing price
      of
      such Common Stock on the principal national securities exchange on which such
      Common Stock is traded on the date for which any determination of Fair Market
      Value is made for any purpose hereunder ("Determination
      Date"),
      or,
      if there shall have been no sales on any such exchange on the Determination
      Date, the average of the highest bid and lowest asked prices on such principal
      exchange on such Determination Date; or

     

    (ii) if
      the
      Common Stock is not listed on a national securities exchange, the closing price
      on the NASD's National Market System, or, if there shall have been no sales
      on
      the Determination Date on the National Market System, the average of highest
      bid
      and lowest asked prices on the Determination Date on the National Market System,
      as applicable; or

     

    (iii) if
      the
      Common Stock is not listed on a securities exchange or the National Market
      System, the average of the representative bid and asked prices of the Stock
      as
      of the close of trading on the Determination Date as quoted in the NASDAQ
      System; or

     

    (iv) if
      the
      Common Stock is not quoted in the NASDAQ System, the average of the high and
      low
      bid and asked prices on the Determination Date in the over-the-counter market
      as
      reported by the NASD Bulletin Board, the National Quotation Bureau,
      Incorporated, or any similar successor organization; or

     

    (v) if
      the
      Common Stock is not listed on or traded in any recognized securities market,
      such value as the Parent and the Stockholder may agree upon; or

     

    (vi) if
      the
      Parent and the Stockholder cannot agree on a value for the Common Stock within
      thirty (30) days after the Parent or the Stockholder has made a written proposal
      with respect to such value to the other party, the fair market value of the
      Stock as of the Determination Date as determined by an Independent Appraisal
      (as
      defined below). The fees and expenses incurred by the Independent Financial
      Expert (as defined below) in rendering its Independent Appraisal shall be paid
      by the Parent. The determination of the Market Value of the Common Stock shall
      be based solely upon the value of the Parent and shall be computed by dividing
      the amount that represents the value of the Parent by the number of outstanding
      shares of Common Stock. In making such a valuation, items such as discounts
      for
      minority interests, lack of marketability of the Common Stock or blockage shall
      not be considered. "Independent
      Appraisal"
      shall
      mean an evaluation of the price that would be paid if the Company were sold
      at
      that time on an orderly basis as a going concern, which evaluation shall be
      made
      by an Independent Financial Expert. "Independent
      Financial Expert"
      shall
      mean an independent financial expert selected by the Company's Board of
      Directors on not less than ten (10) days prior written notice to the Holder
      but
      shall not include any independent financial expert to whom the Holder shall
      object in writing not later than ten (10) days after the Board's delivery of
      notice of selection.

     

    
      
        
        

      

      
        5

        
          

        

      

      
        
        

      

       

    

    7.  Duties
      of Escrow Agent.

     

    (a)  The
      Escrow Agent shall be entitled to rely upon any order, judgment, certificate,
      demand, notice, instrument or other writing delivered to it hereunder without
      being required to investigate the validity, accuracy or content thereof nor
      shall the Escrow Agent be responsible for the validity or sufficiency of this
      Agreement. In all questions arising under this Agreement, the Escrow Agent
      may
      rely on the advice of counsel, and for anything done, omitted or suffered in
      good faith by the Escrow Agent based on such advice, the Escrow Agent shall
      not
      be liable to anyone. The Escrow Agent shall not be required to take any action
      hereunder involving any expense unless the payment of such expense is made
      or
      provided for in a manner reasonably satisfactory to it.

     

    (b)  In
      the
      event conflicting demands are made or conflicting notices are served upon the
      Escrow Agent with respect to the Escrow Account, the Escrow Agent will have
      the
      absolute right, at the Escrow Agent’s election, to do either or both of the
      following: (i) resign as Escrow Agent so a successor can be appointed pursuant
      to clause (e) of this Section 7, or (ii) file a suit in interpleader and obtain
      an order from a court of competent jurisdiction requiring the parties to
      interplead and litigate in such court their several claims and rights among
      themselves. In the event such interpleader suit is brought, the Escrow Agent
      will thereby be fully released and discharged from all further obligations
      imposed upon it under this Agreement, and Parent on the one hand and the
      Stockholder on the other hand will pay the Escrow Agent all costs, expenses
      and
      reasonable attorneys’ fees expended or incurred by the Escrow Agent pursuant to
      the exercise of the Escrow Agent’s rights under this Section 7(b).

     

    (c)  The
      Escrow Agent, its corporate parent, its subsidiary corporations or any of its
      related companies, its employees, agents, officers, and directors, shall be
      indemnified and held harmless by Parent, from and against any and all liability,
      including all expenses reasonably incurred in its defense, to which the Escrow
      Agent, its corporate parent, its subsidiary corporations or any of its related
      companies, its employees, agents, officers, and directors, shall be subject
      by
      reason of any action taken or omitted or any investment or disbursement of
      any
      part of the Escrow Account made by the Escrow Agent pursuant to this Escrow
      Agreement, except as a result of the Escrow Agent’s own gross negligence or
      willful misconduct. This right of indemnification shall survive the termination
      of this Escrow Agreement, and the removal or resignation of the Escrow Agent.
      

     

    (d)  The
      Escrow Agent shall have no interest in the Escrow Account, but is serving as
      escrow holder only and having only possession thereof.

     

    
      
        
        

      

      
        6

        
          

        

      

      
        
        

      

       

    

    (e)  The
      Escrow Agent may resign as Escrow Agent at any time and for any reason
      whatsoever. In the event the Escrow Agent desires to resign as Escrow Agent
      under this Agreement, the Escrow Agent shall deliver a notice to Parent and
      the
      Stockholder stating the date upon which such resignation shall be effective;
      provided
      however,
      that
      any such resignation shall not be effective until at least the 15th
      business
      day after Parent and the Stockholder receive such notice. Upon the receipt
      of
      any such notice from the Escrow Agent, Parent may appoint a successor escrow
      agent without the consent of the Stockholder so long as such successor is a
      bank
      or trust company with assets of at least $500 million and may appoint any other
      successor escrow agent with the consent of the Stockholder, which consent shall
      not be unreasonably withheld. In the case of the appointment of any successor
      escrow agent requiring the consent of the Stockholder as set forth in the
      preceding sentence, Parent and the Stockholder shall deliver a written notice
      to
      the Escrow Agent designating the successor escrow agent. Upon the effectiveness
      of the resignation of the Escrow Agent, the Escrow Agent shall deliver the
      Escrow Account to any successor escrow agent properly designated hereunder,
      whereupon the Escrow Agent shall be discharged from any and all further
      obligations arising hereunder. The Escrow Agent shall be paid any outstanding
      fees and expenses prior to transferring assets to a successor escrow agent.
      If
      upon the effective date of resignation of the Escrow Agent a successor escrow
      agent has not been duly designated, the Escrow Agent’s sole responsibility after
      that time shall be to retain and safeguard the Escrow Account until receipt
      of a
      designation of successor escrow agent or a final nonappealable order of a court
      of competent jurisdiction.

     

    (f)  In
      no
      event shall the Escrow Agent be liable to any party for any special, indirect
      or
      consequential loss or damage of any kind, even if the Escrow Agent has been
      previously advised of the possibility of such loss or damage.

     

    8.  Termination.
      This
      Agreement shall terminate upon the later of the Termination Date or the release
      by the Escrow Agent of all of the property then held in the Escrow Account
      pursuant to a written direction executed by Parent and the Stockholder or in
      accordance with Section 3(e) of this Agreement.

     

    9.  Merger
      of Escrow Agent.
      In the
      event the Escrow Agent is merged with, acquired or otherwise combined with
      another entity, or the Escrow Agent transfers all or substantially all of its
      assets, the successor as a result of such transaction will be the Escrow Agent
      hereunder without any further action by the parties hereto. 

     

    10.  Notices.
      All
      notices, instructions and other communications given hereunder or in connection
      herewith shall be in writing. Any such notice, instruction or communication
      shall be sent either (i) by registered or certified mail, return receipt
      requested, postage prepaid, or (ii) via a reputable nationwide overnight courier
      service, in each case to the address set forth below. Any such notice,
      instruction or communication shall be deemed to have been delivered three
      business days after it is sent prepaid, or 1 business day after it is sent
      via a
      reputable nationwide overnight courier service.

     

    
      
        
        

      

      
        7

        
          

        

      

      
        
        

      

    

     

     

    
      	
               

            	
              If
                to Parent:

            	 	IsoRay,
              Inc. 
              350
                Hills Street, Suite 106

              Richland,
                Washington 99354
                
                Attn:
                  Chief Executive Officer
Fax: (509)
                  375-3473

              

            
	 	 	 	 
	 	
              With
                a copy to:

            	 	Keller
              Rohrback, P.L.C.
              3101
                North Central Avenue, Suite 900

              Phoenix,
                Arizona 85012-2600

              Attn:
                Stephen R. Boatwright, Esq.   

              Fax:
                (602) 248-2822

            
	 	 	 	 
	 	
              If
                to the
                Stockholder:

            	 	Anthony Silverman
	 	 	 	 
	 	
              With
                a copy to:

            	 	Firetag
              Law Firm, P.C.
              5611
                North 16th
                Street

              Phoenix,
                Arizona 85016-0001

              Attn:
                Stephen T. Meadow, Esq.

              Fax:
                (602) 241-1260

            
	 	 	 	 
	 	
               If
                to the Escrow
                Agent:

            	 	IsoRay Medical, Inc. 
              350
                Hills Street, Suite 106

              Richland,
                Washington 99354
                
                Attn:
                  Chief Executive Officer
Fax: (509)
                  375-3473

              

            
	 	 	 	 
	
               

            	
              With
                a copy to:

            	 	
              Keller
                Rohrback, P.L.C.

              3101
                North Central Avenue, Suite 900

              Phoenix,
                Arizona 85012-2600

              Attn:
                Stephen R. Boatwright, Esq.   

              Fax:
                (602) 248-2822

            

    

     

    Any
      party may give any notice, instruction or communication in connection with
      this
      Agreement using any other means (including personal delivery, facsimile or
      ordinary mail), but no such notice, instruction or communication shall be deemed
      to have been delivered unless and until it is actually received by the party
      to
      whom it was sent. Any party may change the address to which notices,
      instructions or communications are to be delivered by giving the other parties
      to this Agreement notice thereof in the manner set forth in this Section
      10.

     

    

    
      
        
        

      

      
        8

        
          

        

      

      
        
        

      

    

    

    11. General

     

    (a)  Effectiveness.
      This
      Agreement will become effective automatically upon the Closing of the Merger.
      Unless and until the Merger closes, this document shall be of no force or
      effect.

     

    (b)  Governing
      Law.
      This
      Agreement shall be construed in accordance with, and governed in all respects
      by, the internal laws of the State of Delaware (without giving effect to
      principles of conflicts of laws).

     

    (c)  Counterparts.
      This
      Agreement may be executed in several counterparts, each of which shall be deemed
      an original, but all of which together shall constitute one and the same
      instrument.

     

    (d)  Entire
      Agreement.
      Except
      as set forth in the Merger Agreement, this Agreement constitutes the entire
      understanding and agreement of the parties with respect to the subject matter
      of
      this Agreement and supersedes all prior agreements or understandings between
      the
      parties with respect to the subject matter hereof.

     

    (e)  Waivers.
      No
      failure on the part of any party to exercise any power, right, privilege or
      remedy under this Agreement, and no delay on the part of any party in exercising
      any power, right, privilege or remedy under this Agreement, shall operate as
      a
      waiver of such power, right, privilege or remedy and no single or partial
      exercise of any such power, right, privilege or remedy shall preclude any other
      or further exercise thereof or of any other power, right, privilege or remedy.
      No party shall be deemed to have waived any claim arising out of this Agreement,
      or any power, right, privilege or remedy under this Agreement, unless the waiver
      of such claim, power, right, privilege or remedy is expressly set forth in
      a
      written instrument duly executed and delivered on behalf of such party; and
      any
      such waiver shall not be applicable or have any effect except in the specific
      instance in which it is given.

     

    (f)  Amendment.
      This
      Agreement may be amended only with the written consent of Parent, the Escrow
      Agent and the Stockholder (or their duly designated successors).

     

    12.   Tax
      Reporting Matters.

     

    (a)   The
      Escrow Agent may require the Stockholder to provide the Escrow Agent with a
      certified tax identification number for such Stockholder by furnishing
      appropriate Form W-9 and other forms and documents that the Escrow Agent may
      reasonably request (collectively, “Tax
      Reporting Documentation”).
      The
      parties hereto understand that, if such Tax Reporting Documentation is not
      so
      certified to the Escrow Agent, the Escrow Agent may be required by the Internal
      Revenue Code of 1986, as it may be amended from time to time, (the “Code”),
      to
      withhold a portion of the Escrow Shares or other property held in the Escrow
      Account by the Escrow Agent pursuant to this Agreement. Notwithstanding anything
      herein to the contrary, the Escrow Agent shall have no obligation to file or
      prepare any tax returns or to prepare any other reports for any taxing
      authorities concerning the matters covered by this Escrow
      Agreement.

     

    
      
        
        

      

      
        9

        
          

        

      

      
        
        

      

       

    

    (b)  The
      Escrow Agent need not make any distribution of any Escrow Shares, monies or
      other property to the Stockholder (or any assignee or transferee of such
      Stockholder) if such Stockholder (or assignee or transferee) has not furnished
      to the Escrow Agent such Tax Reporting Documentation as the Escrow Agent may
      require. 

     

    (c)  Any
      cash
      received by the Escrow Agent under Section 5(c) of this Agreement shall be
      allocated for tax reporting purposes to the Stockholder in accordance with
      the
      dollar amount such Stockholder is entitled to receive in lieu of such
      Stockholder’s fractional shares as provided in Section 5(c) herein.

     

    In
      Witness Whereof,
      the parties have duly executed this Agreement as of the day and year first
      above
      written.

     

    Parent: 

     

    CENTURY
      PARK PICTURES CORP.

     

    By:__________________________

     

    Title:
      __________________________

     

    The
      Company and Escrow Agent: 

     

    ISORAY
      MEDICAL, INC.

     

    By:
      __________________________

     

    Title:
      __________________________

     

    Stockholder:

    

    __________________________

    Anthony
      Silverman

     

     

    
      
        
        

      

      
        10

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