

Unpublished works are treated differently from published works under US copyright law. As of 2010, it is not known whether the use of music in a film constitutes publication of the music for the purpose of copyright. The use of music in a film can cause uncertainty with regard to copyright. Experts in the field of public domain sometimes differ in their opinions as to whether a particular film is in the public domain. A film can lose its copyright in some of those elements while retaining copyright in other elements.

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