The U.S. version:
http://www.copyright.gov/help/faq/faq-fairuse.html
I recently ran into a questionable circumstance as outlined here, and figured this could potentially prove helpful to others:
On the subject of who owns the copyright:
Even if a person hires a photographer to take pictures of a wedding, for example, the photographer will own the copyright in the photographs unless the copyright in the photographs is transferred, in writing and signed by the copyright owner, to another person. The subject of the photograph generally has nothing to do with the ownership of the copyright in the photograph.
Somebody infringed my copyright. What can I do?
A party may seek to protect his or her copyrights against unauthorized use by filing a civil lawsuit in federal district court. If you believe that your copyright has been infringed, consult an attorney. In cases of willful infringement for profit, the U.S. Attorney may initiate a criminal investigation.
Source: http://www.copyright.gov/help/faq/faq-fairuse.html
Hey mod- can we make this a "sticky" thread?