The following chart illustrates the most easily quantified evidence of the expansion of U.S. copyright law. The first federal copyright legislation, the 1790 Copyright Act. Set the maximum term at fourteen years plus a renewal term of fourteen years. The 1831 Copyright Act doubled the initial term and retained the conditional rewal term, allowing a total of up to forty-two years of protection. In 1909, lawmakers doubled the renewal term letting copyrights run for up to fifty-six years. The interim renewal acts of 1962 through 1974 ensured that the copyright in any work in its second term as of September 19, 1962, would not expire before Dec. 31, 1976. The 1976 Copyright Act changed the measure of the default copyright term to life of the author plus fifty years. Recent amendments to the copyright Act expanded the term yet again. letting it run for the life of the author plus seventy years.
http://www.tomwbell.com/writings/(C)_Term.html
Copyright is a form of intellectual property. The following is the copyright and Fair Use Guideline for teachers.
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