This drawing by Eric Heel, MIT lawyer and engineer, illustrates copyright rights, unregulated uses, and fair use. He asks, "Have you ever seen a copyright notice that says 'It is illegal to make a copy of this copyrighted document'? Well, that's not true, because it excludes fair use." Read his explanation at http://www.erikjheels.com/?p=803
Copyright Navigator illustrates more of copyright's intricacy. It's an interactive flowchart, by Lionel S. Sobel of Southwestern University, showing many details of US Copyright law. You can see it at:http://navigator.carolon.net/
