Fair use is a concept that allows an artist to use pieces of material that is under copyright protection and repurpose it.
From http://www.centerforsocialmedia.org/
http://www.youtube.com/watch?v=0vxCgxRzjFQ
This video brilliantly inserts John McCain into the final scene of Pulp Fiction, and juxtaposes the words of Samuel L. Jackson’s character, Jules Winnfield, with the speech in order to create the illusion of a direct conversation between McCain and his critics. Note the moment that Jules refers to McCain as “the evil man.” An Obama ‘08 logo is the last image of the video, but the video is unaffiliated with the Obama campaign
Learn more about Fair use at http://www.centerforsocialmedia.org/