Changes

Copyright protects authors of "original works of authorship", including literary, dramatic, musical, artistic, software, and certain other intellectual works. This protection is available to both published and unpublished works.  It does not protect the ideas contained in the work, just the original creative expression of those ideas.

Copyright protects authors of "original works of authorship", including literary, dramatic, musical, artistic, software, and certain other intellectual works. This protection is available to both published and unpublished works.  It does not protect the ideas contained in the work, just the original creative expression of those ideas.

Under Section 105 of the copyright law, "Copyright protection under this title is not available for any work of the [[United States]] Government, but the United States Government is not precluded from receiving and holding copyrights transferred to it by assignment, bequest, or otherwise."

Under Section 105 of the copyright law, "Copyright protection under this title is not available for any work of the [[United States]] Government, but the United States Government is not precluded from receiving and holding copyrights transferred to it by assignment, [[bequest]], or otherwise."

The duration of U.S. copyright has changed several times.  It was 14 years as originally enacted, then doubled to 28 years, and an option for creators to renew that for another 28 years was added.  In 1976, under pressure from foreign countries (which had copyright terms extending 50-70 years after the death of the creator, even for works created when they were young) and from large entertainment corporations such as Disney (which had valuable properties whose copyrights were in danger of expiring) Congress extended the duration of copyright to 75 years.  Two decades later, they added another 20 years.  Neither of these extensions applied to copyrights that had already expired, so anything published in the United States before 1923 is in the [[public domain]] in that country.<ref>http://www.copyright.cornell.edu/training/Hirtle_Public_Domain.htm</ref>  Also, photographs of paintings in the public domain would ordinarily not qualify for copyright protection either.<ref>''[[Bridgeman Art Library v. Corel Corp.]]''</ref>

The duration of U.S. copyright has changed several times.  It was 14 years as originally enacted, then doubled to 28 years, and an option for creators to renew that for another 28 years was added.  In 1976, under pressure from foreign countries (which had copyright terms extending 50-70 years after the death of the creator, even for works created when they were young) and from large entertainment corporations such as Disney (which had valuable properties whose copyrights were in danger of expiring) Congress extended the duration of copyright to 75 years.  Two decades later, they added another 20 years.  Neither of these extensions applied to copyrights that had already expired, so anything published in the United States before 1923 is in the [[public domain]] in that country.<ref>http://www.copyright.cornell.edu/training/Hirtle_Public_Domain.htm</ref>  Also, photographs of paintings in the public domain would ordinarily not qualify for copyright protection either.<ref>''[[Bridgeman Art Library v. Corel Corp.]]''</ref>