There are several issues: - what's "public domain" changes, sometimes retroactively - orphan works https://en.wikipedia.org/wiki/Orphan_works_in_the_United_St

There are several issues: - what's "public domain" changes, sometimes retroactively - orphan works https://en.wikipedia.org/wiki/Orphan_works_in_the_United_States https://en.wikipedia.org/wiki/Orphan_works_in_the_United_Sta...