Quote:
Originally Posted by Andrew H.
The period should also be long enough that the author can get a good price for selling the copyrighted work (meaning that he is selling the rights for a long enough period of time for someone to want to pay a lot of money for it). Having said that, death + 70 years may be too long.
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I just wanted to add one tidbit. It's death +70 for works published since 1978.
Before that it's 95 years from date of publication. This is why no further material will hit US public domain before 2019.