Here are a few of the many resources available on-line for learning about copyright.
Clearance Center: Vanderbilt
obtains the majority of their copyright permissions
from this not-for-profit organization, originally
mandated by an act of Congress. They offer a variety of resources for learning about copyright..
of Texas: Offers a crash course in copyright.
U. S. Copyright
The ultimate source
for Copyright Law, if you don't mind reading
University's Copyright page is another valuable
resource for copyright law information.