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It was not until a full 180 years after its establishment that it was significantly extended beyond that, through the Copyright Act of 1976 to "Either 75 years or the life of the author plus 50 years" and the Sonny Bono Copyright Term Extension Act of 1998 (also called the "Mickey Mouse Protection Act", because it prevented the copyright from expiring on the first commercial success of the Disney cartoon character Mickey Mouse), which increased it even more, to 120 years, or the life of the author plus 70 years, whichever ends earlier. 40 years later, the initial term was changed to 28 years. The length of copyright established by the Founding Fathers was 14 years, plus the ability to renew it one time, for 14 more. federal copyright law, the Copyright Act of 1790. United States copyright law traces its lineage back to the British Statute of Anne, which influenced the first U.S. Main article: History of copyright law of the United States The United States Copyright Office handles copyright registration, recording of copyright transfers, and other administrative aspects of copyright law. Under the Copyright Clause, Congress has the power "To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries." The United States Constitution explicitly grants Congress the power to create copyright law under Article 1, Section 8, Clause 8, known as the Copyright Clause.

United States copyright law was last generally revised by the Copyright Act of 1976, codified in Title 17 of the United States Code. In the United States, works published before January 1, 1928, are in the public domain. These exclusive rights are subject to a time limit, and generally expire 70 years after the author's death or 95 years after publication. With the stated purpose to promote art and culture, copyright law assigns a set of exclusive rights to authors: to make and sell copies of their works, to create derivative works, and to perform or display their works publicly. The copyright law of the United States grants monopoly protection for "original works of authorship".