Quote:
Originally Posted by Psymon
not declaring copyright at all does potentially leave open the door for anyone to do whatever they want to. A rather notable example of that is the 1963 Cary Grant and Audrey Hepburn film, Charade -- the studios had neglected to include a copyright notice anywhere in the credits, and thus the very day it was released in the theatres, it was in the public domain.
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That's because the US wasn't a signatory to the Berne Copyright Convention at the time. In all Berne countries (which now include the US) copyright automatically exists as soon as a creative work comes into being.