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OWL at Purdue
The Online Writing Lab (OWL) at Purdue University houses writing resources and instructional material, and we provide these as a free service of the Writing Lab at Purdue. Students, members of the community, and users worldwide will find information to assist with many writing projects. Teachers and trainers may use this material for in-class and out-of-class instruction.
United States Copyright Office, Duration of Copyright PDF
The provisions of copyright law dealing with duration are complex. Different standards apply depending on whether federal statutory copyright protection was secured before or on or after January 1, 1978, the date of the current law–the Copyright Act of 1976–to effect. In addition, several amendments enacted since January 1, 1978, affect duration. This circular describes the changes to the law that affect duration and gives details about terms of protection for copyrights secured and renewed on certain dates.