Here's a very good presentation by Josh Wattles done at Comic-con. He works for Deviant Art and is a copyright lawyer.
Josh Wattles,is an expert on copyright law bringing perspective and experience to the issue from multiple creative industries. From art, film, music, and books, Josh has been directly involved in or advised on copyright issues for the biggest properties in the world. He is also a copyright professor teaching courses at at Loyola, Southwestern and the University of Southern California law schools in Los Angeles.
Click here to watch the video