This is topic Copyright Breakdown in forum Open Discussions About Writing at Hatrack River Writers Workshop.
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Posted by redux (Member # 9277) on :
Copyright questions often come up and I found this site to be quite helpful.http://copyright.cornell.edu/resources/publicdomain.cfm
A pdf version is available here:
http://copyright.cornell.edu/resources/docs/copyrightterm.pdf
Just spreading the copyright love 
Cheers!
redux