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I like the lifetime + 25 years IF the author holds the copyright. If a corporation holds the copyright then it expires after 10 years after publication and distribution ceases. Publication can be printed or in electronic form, Ebook or Audible version. Maximum corporate copyright ends in 35 years from first publication. BTW many items are now public domain, particularly SF and mysteries, due to copyright originally being held by magazines. Once a magazine was published the publisher had no interest in maintaining individual story copyrights.
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