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Undo revision 1146722 by AtheistAndProudOfIt (talk)
'''Copyright duration''' refers to how long copyright remains valid before a work enters into the [[public domain]] and can be freely used by anyone without attribution.
Any work created before 1923 is automatically in the public domain.
Any work published between 1923 and 1977 but published without a copyright notice is in the public domain.
Any work published between 1978 and 1 March 1, 1989 without a [[copyright notice]] and without subsequent registration with the Copyright Office is in the public domain.
== Sources ==
[http://www.copyright.cornell.edu/training/Hirtle_Public_Domain.htm Cornell's Chart for Copyright duration]
[http://www.bpmlegal.com/copyterm.html Law firm's Chart for Copyright duration]
[[category:Copyright]]