Documentary filmmakers have created, through their professional associations, a clear, easy to understand statement of fair and reasonable approaches to fair use. Fair Use is the right, in some circumstances, to quote copyrighted material without asking permission or paying for it. It is a crucial feature of copyright law. In fact, it is what keeps copyright from being censorship. You can invoke fair use when the value to the public of what you are saying outweighs the cost to the private owner of the copyright.