Please read Chapter 9 (a,b,c,d) from the following website
Fair Use
http://fairuse.stanford.edu/Copyright_and_Fair_Use_Overview/chapter9
See/Read
Free Culture: Lawrence Lessig Keynote from OSCON 2002
http://www.oreillynet.com/pub/a/policy/2002/08/15/lessig.html
View Flash presentation on "Free Culture"
http://randomfoo.net/oscon/2002/lessig/free.html
(If you experience a slow server response try again in 5 minutes)
http://randomfoo.net/oscon/2002/lessig/
recommended:
Lessig
http://www.lessig.org/blog/
http://lessig.org/blog/2006/01/google_book_search_the_argumen.html