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I really should have checked before posting, particularly when I'd just dragged myself out of bed. It's actually 70 years after the death of the author for post 1978 works. For anonymous, pseudonymous, or work made for hire, it's 95 years from publication or 120 years from creation, whichever expires first.
Only works created prior to 1st January 1978 are subject to renewal registration. Furthermore, copyright is a personal property right, and is subject to the various (country specific) laws and regulations that govern ownership, inheritance, transfer of personal property, etc.
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