S.17 to 21 of the Copyright Ordinance deal with the duration of copyright works. The author of the work is deemed to be the person who creates the work (with exceptions for commissioned works and employee works). S.17(1) to (5) states that the duration of copyright of literary, dramatic, musical and artistic works is the life of the author plus 50 years, or 50 years from the end of the year in which the work was first created or made available to the public if the identity of the author is not known.