prevailing in similar cases, but such claim may not be made in advance of
the use and it shall not be enforceable after the lapse of two years from the
time when the owner of copyright work first received knowledge of the
circumstances which give rise to the claim:
Provided that the owner of the copyright may not claim to have received
such knowledge after the expiration of six years from the date of the contract
to be amended.
(5) Where the user does not exercise an exclusive right conferred on him by
the owner of copyright the owner may revoke such right if the non-exercise
thereof was prejudicial to his legitimate interests.
(6) The right of revocation under subsection (5) may be exercised only after
the period of delay stipulated in the contract for commencing the exercise of
the exclusive right by the person on whom it is granted has expired but, in
any case, not earlier than two years:
(a) from the grant of such right; or
(b) if the work to be used was supplied subsequent to the grant of
the right, from the date of its delivery.
(7) In each of the cases under paragraph (a) or (b) of subsection (6) the
owner of copyright shall notify the user of the proposed revocation, allowing
him a reasonable additional time in which to exercise the exclusive right, but
where the exercise of the right by the user has become or is impossible or
the user has refused the right, the owner's right of revocation may be
exercised in accordance with subsection (6).
(8) A contract on future grant of rights for the use of works to be created
thereafter and not specified in detail but only mentioned in general or by
reference to their nature, may be terminated by either party with six months
notice after a period of four years from the conclusion of the contract.
Commissioned work
16. (1) Where a contract is in respect of work to be created (in this Act
referred to as "commissioned work") the user shall be under an obligation to
make a declaration respecting acceptance of the work within sixty days from
the date on which the work was handed over or, if such work is regulated
under another written law, within such period as is prescribed for acceptance
under that law, and if the user fails to make such declaration within such
period he shall be deemed to have accepted the work.
(2) Within the time allowed under subsection (1) for acceptance of
commissioned work, the user may, once or repeatedly, return the work to the
author and require him to amend or correct the work taking into
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