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How do I determine if a work has entered the public domain?
Public Domain works are those that fall into any of the following three categories:
1. Publications dated 1922 or earlier.
2. Works that do not include a copyright notice and were first published before January 1, 1978.
3. Most United States government documents.
Once a work has acquired public domain status it is no longer eligible for copyright protection. Use of material of this status is permissible without the copyright owner's permission.
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