Thread: Rule of Thumb, US Copyright
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Old 06-20-2010, 11:18 PM   #6
bgalbrecht
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The rule of thumb for US copyrights is that if it was originally published before 1923, it's in the public domain, if it was published before 1964 and not copyright was not renewed 28 years after the original copyright, it's in the public domain. Anything published prior to 1978 that's in copyright currently has a 95 year copyright term, (so The Richest Man in Babylon should become public domain on 1 January 2022, not 2027 as Iphinome listed), and anything published after 1977 has a copyright term of life+70.

Here are URLs for searching US Copyright/Copyright renewal:
Copyright renewal search at Stanford
Library of Congress Copyright search
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