Please keep in mind that this chart only deals with works published or created in the United States. This chart covers the basic areas of determining how long a work is covered by copyright.
For more detailed information, as well as copyright durations of foreign works, please consult Peter Hirtle's chart Copyright Term and the Public Domain in the United States, Laura Gasaway's chart When Works Pass Into the Public Domain, or Michael Brewer's interactive web tool Digital Copyright Slider. You can also check the U.S. Copyright Office's Catalog of Copyright Entries to see when a work may have been registered (Digitized through University of Pennsylvania).