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Period: to
1900 to 2011
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All works created priort ot 1923 are in the Public Domain.
All works created priort ot 1923 the copyright has expired. They are all in the Public Domain -
Works created after 1923, but before 1964 the creator must file for renewal of copyright.
If the creator did not file for renewal of copyright for works created after 1923, but before 1964, the work falls into the Public Domain. -
Work created prior to 1989 without official copyright paperwork filed falls into the Public Domain.
All works created prior to 1989 creators had to file official copyright paperwork for their works to be protected. If they did not file the official paperwork, the work falls into the Public Domain.