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Discussion over "claims" of copyright on scanned Public Domain documents
There is tons of case law that covers the copyright protection available on scans of public domain works. In summary, they are not copyrightable under US law (see case law below). Generally speaking if the scanning process requires creativity, the resulting image will be copyrightable. However if the process is a mechanical copying process producing an image with minor differences from the original, the resulting image will not be copyrightable. The scans must have creative substance to qualify.
In the U.S. exact photographic reproductions of printed material are not copyrightable. The Constitution has an originality requirement (thankfully) for creative works and in the "Bridgeman" case the court ruled as such:
As pointed out by courts, hard work alone is not copyrightable nor original. Of course reproductions *could* contain sufficient originality to be protected. However, the U.S. Copyright Office has refused to register most photographic reproductions of public domain material, and yes scanning is "photographic".
Copyright of Government Documents
In the United States, U.S. Government works are covered by 17 USC § 105.59 "Copyright protection … is not available for any work of the United States Government, but the United States is not precluded from receiving and holding copyrights transferred to it by assignment, bequest, or otherwise." Exceptions are available for certain works of the National Institute for Standards and Technology (NIST) and the U.S. Postal Service. Copyright protection may be available for U.S. Government works outside the United States. When a copyrighted work is transferred to the U.S. Government, the Government becomes the copyright owner and the work retains its copyright protection.