(2) A contract which requires the total transfer of the economic rights specified in section 8 shall be limited in scope to the use provided for in that contract. (3) An assignment of right under this Act shall be in writing and shall be signed by the owner of the rights or by the person authorized by him for the purpose. (4) A licence to do any act falling within a copyright may be oral or in writing. (5) In case of work of joint authorship an assignment or licence in respect of such work shall be subject to the authorization of the joint authors thereof. (6) Where a work is work of joint authorship and one of the joint authors withholds his consent to an assignment or the granting of a licence, the matter shall be referred to the Society to determine whether or not consent should be granted in respect of the assignment or licence and upon what conditions. (7) The Society shall assign reasons for its decision under subsection (6) and any appeal against that decision shall lie to the High Court. (8) An assignment, a licence or testamentary disposition may be made or granted in respect of a future or an existing work. (9) Where under bequest, whether specific or general, a person is entitled to a manuscript of a literary, dramatic, musical or artistic work which was not published before the death of the testator, such bequest shall be construed as including the copyright in the work in so far as the testator was the owner of the copyright immediately before his death, unless a contrary intention is indicated in the testator's will or codicil thereto. Contracts for authorization of use of rights under this Act 15. (1) Authorization by the owner of copyright for the use of a work shall be granted to the user under a contract in writing conferring on the latter the rights required for the envisaged use upon such conditions as may be stipulated in the contract. (2) A contract made pursuant to subsection (1) shall clearly specify the rights conferred on the user and such rights shall be non-exclusive unless the contract clearly specifies that they are exclusive rights. (3) The user of rights under a contract made pursuant to subsection (1) shall not be entitled to transfer such rights except if the transfer is made under a contract in writing and subject to the prior consent in writing of the owner of the rights. (4) Where a contract has been entered into and it is found that there is a gross disproportion between the remuneration paid by the user of the work and the income derived by the user from the use thereof, the owner of the copyright may request an amendment of the contract so as to secure for himself an equitable share of income, corresponding to standards generally 19