What is the proof of the authorship of a work?
Where, in the case of a literary, dramatic, musical or artistic work, a name purporting to be that of the author or the publisher appears on copies of the work as published, or, in the case of an artistic work appeared on the work where it was made, the person whose name so appears or appeared shall, in any proceeding in respect of copyright in such work, be presumed, unless the contrary is proved, to be the author or the publisher of the work, as the case may be.
