Academic Responses & Training
Copyright Basics <12 page pdf> from the U.S. Copyright Office
Copyright Act - complete text of the Title 17 of the U.S. Code
U.S. Copyright Office web site
Chart: Copyright Term and the Public Domain in the United States, by Peter Hirtle, Cornell University
A work does not have to be registered with the Copyright Office in order to be protected by the Copyright Law, but there are advantages, such as the right to statutory damages and attorneys fees if your work is infringed.