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Interestingly, work that can be copyrighted essentially does not expire.
Not really true, though it can almost seem like it on newer works. You used to have to register, then renew in order to maintain copyright, with renewal limits. Now if it's published it's copyrighted. After 1978 the copyright term is the life of the author plus 70 years. And for works published or registered before 1978, the maximum copyright duration is 95 years from the date of publication, if copyright was renewed during the 28th year following publication.