less than one month’s notice, terminate the agreement not earlier than 3 years after it was signed or such shorter period as may have been agreed. (2) 14. The right of termination referred to in subsection (1) may not be waived in advance. Non-use of economic rights (1) Subject to subsection (2), where a person to whom an economic right in a work has been assigned or an exclusive licensee does not exercise his right, or does so only inadequately and the author’s legitimate interests are prejudiced by such failure, the author may revoke the assignment or exclusive licence. (2) A revocation in accordance with subsection (1) shall not be effected where the non- exercise or inadequate exercise of a right is primarily due to circumstances which the author can be expected to remedy. (3) The right to revoke an assignment or a licence in accordance with subsection (1) shall not be exercised earlier than 3 years from the date of assignment or licence, or, if the work is supplied subsequently, from the date of delivery of the work. (4) 15. The right of revocation referred to in subsection (1) may not be waived in advance. Duration of copyright (1) The economic and moral rights shall be protected during the lifetime of the author and for 50 years after his death. (2) For a work of joint authorship, the economic and moral rights shall be protected during the life of the last surviving author and for 50 years after his death. (3) For an audiovisual work, the economic and moral rights shall be protected for 50 years from the date on which the work was made or first made available to the public by publication, or by any other means, whichever date is the latest.