Trying to put public domain works back under copyright protection does seems a little like trying to close Pandora's box. People could be using the works that have entered the public domain in all sorts of ways - would those suddenly be deemed illegal?
When, for example, Australia increased its copyright term from 50 to 70 years, all works which had entered the public domain due to "life + 50" status remained in the public domain. To attempt to do otherwise seems like an exercise in futility.
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