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Subject to subsection (2), in the case of a literary, dramatic or musical work, or an engraving, in which copyright subsists at the date of the death of the author — or, in the case of a work of joint authorship, at or immediately before the date of the death of the author who dies last — but which has not been published or, in the case of a lecture or a dramatic or musical work, been performed in public or communicated to the public by telecommunication, before that date, copyright subsists for the longer of