One must defend a Patent. I think a similar feature should be present for Copyright.
I think a compromise needs to be made for books no longer in print. If neither the publisher nor the author has a new book or an eBook for sale for a period - say 10 years, then the work should in some fashion revert to public domain.
Another compromise should be made for books where the copyright holder cannot be found. Perhaps 10 years as well.
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