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punctuation, clarify last few sentences: copyright as of the 1976 Act automatically attaches to any original work of authorship fixed in a tangible medium, remove unclear/false web server statement
Two examples of material in the public domain are [[United States]] [[government]] works, and writings for which their copyright has expired. In the United States, anything published before 1923 no longer has copyright protection and is in the public domain.<ref>[http://www.copyright.cornell.edu/training/Hirtle_Public_Domain.htm Public Domain]</ref> Laws vary by country, but in most of the world, works whose authors died at least 50, 70, or 100 years ago are in the public domain.
Two examples of material in the public domain are [[United States]] [[government]] works, and writings for which their copyright has expired. In the United States, anything published before 1923 no longer has copyright protection and is in the public domain.<ref>[http://www.copyright.cornell.edu/training/Hirtle_Public_Domain.htm Public Domain]</ref> Laws vary by country, but in most of the world, works whose authors died at least 50, 70, or 100 years ago are in the public domain.
[[Fair use]] is not needed when copying material that is in the public domain because there is no copyright holder. However, physical access to the works may be controlled by a museum that makes users promise not to make any reproductions. Texts and images published in the U.S. before January 1, 1923 are in the public domain. Work created by the federal government is in the public domain (but not work created by state of local governments). Before the Copyright Act of 1976 copyright expired after 28 years and had to be renewed for an additional 28 year term; items published prior to 1964 that were not renewed are in the public domain.<ref> For a list of renewals see the Project Gutenberg collections at [http://onlinebooks.library.upenn.edu/webbin/gutbook/lookup?num=11800], which cover everything except music.</ref> Items that were published in the USA but never copyright in the first place are in the public domain in the USA. Items posted on web servers in the U.S. are covered only by American law.
[[Fair use]] is not needed when copying material that is in the public domain because there is no copyright holder. However, physical access to the works may be controlled by a museum that makes users promise not to make any reproductions. Texts and images published in the U.S. before January 1, 1923 are in the public domain. Work created by the federal government is in the public domain (but not work created by state of local governments). Before the Copyright Act of 1976, copyright expired after 28 years and had to be renewed for an additional 28 year term; items published prior to 1964 that were not renewed are in the public domain.<ref> For a list of renewals see the Project Gutenberg collections at [http://onlinebooks.library.upenn.edu/webbin/gutbook/lookup?num=11800], which cover everything except music.</ref> Items that were published in the USA before 1989 without a copyright notice are, with a few exceptions, in the public domain.
== See also ==
== See also ==