Duration of copyright in unpublished authorial works under this Part
17.—(1)  This regulation applies where copyright subsists in an unpublished authorial work only because of the operation of this Part.
(2)  Despite any provision of the Act, copyright in the unpublished authorial work expires upon the expiry of the equivalent protection of the work under the law of the country of origin of the work.
(3)  Paragraph (2) does not apply to any copyright subsisting immediately before 21 November 2021 in an unpublished authorial work.
(4)  For the purposes of paragraph (2), the country of origin of an unpublished authorial work is —
(a)in the case of a work made over a period of time — whichever of the following countries that provides the longest term of equivalent protection for the work:
(i)the country of which the author was a citizen or national for a substantial part of that period;
(ii)the country in which the author was resident for a substantial part of that period; and
(b)in any other case — whichever of the following countries that provides the longest term of equivalent protection for the work:
(i)the country of which the author was a citizen or national when the work was made;
(ii)the country in which the author was resident when the work was made.