I'm writing a textbook and I'd like to include an old paper from Alan Turing as an appendix. Searches on Google turn up copies of the paper, but I cannot seem to find anything explicitly indicating if it's public domain or not.
Copyright restrictions are for the author/creator's lifetime, plus 70 years after their death. From Wikipedia: http://en.wikipedia.org/wiki/Alan_Turing He died in 1954, so add 70 to that and you get his work under copyright until 2024.
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