Its not exactly the age. Its the copyright. Once the copyright expired (30
years usually) it can be distributed openly, unless it is renewed by the
original person.
Originally it was a term of 20-something years, with a renewal of
somethingorother. Then (1970s?)it became lifetime of author + 50
years, then +75 years.
Basically it's a mess. You need a forum where people who specialize
in this hang out. Or you need a lawyer.
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