Because of historical changes in copyright law, and differences in copyright law from country to country, it is often difficult to determine exactly what is and is not under copyright, and where. In the United States, prior to 1978, works were given 28 years of copyright protection, followed by the possibility of a 28 more years (56 total), if application for renewal was made during the 28th year of the first term of protection. As of 1978 the renewal period for works still under copyright was extended to 47 years (75 total), and later an additional 20 years was added to this (making the renewal period 67 years, for a total of 95 years of protection). Beginning in 1964, copyright holders were no longer required to apply for renewal; copyright protection was automatically extended to 75 years, and later 95 years. See US Copyright Office Circular 15a (in .pdf format) for further details.
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