Fair Use and Copyright issues are incredibly important in today's schools.  Here are a few links to help you keep updated!

Library of Congress

Questions and answers on copyright and fair use from the Library of Congress

http://www.loc.gov/teachers/usingprimarysources/copyright.html

U.S. Copyright Office

Up to date information on fair use including the basic factors used for evaluating resources.  This site also contains quite a bit of information on the law surrounding copyright. 

https://copyright.gov/fair-use/more-info.html