Here are some links to selected important copyright documents including actual laws, acts and treaties.

Copyright Law of the U.S. (Title 17 - text – downloadable)

Copyright Law of the U.S. (text)

Copyright Registration Procedures

U.S. Copyright Office, Information: Circulars and Fact Sheets (pdf & text)

Digital Millennium Copyright Act - Summary (pdf)

Digital Millennium Copyright Act (pdf & text)

WIPO Copyright Treaty - 1996 (text)

TEACH Act (text)

Berne Convention (as revised – Paris Text - 1971)

CONFU: The Conference on Fair Use (pdf)