A copyright assignment must be in writing and signed by or on behalf of the assignor. It is possible to assign rights in specific works, or even to assign specific rights in specific works, for example, to issue mechanical licences but not synchronisation licences. Partial or total assignment An assignment or other transmission of copyright can be partial. Partial has two meanings. First, it can apply to one or more (but not all) of the ‘things’ the copyright owner has the exclusive right to do. Secondly, it applies to part but not the whole of the copyright period. Note, in section 90(2) of the Copyright, Designs and Patents