The Copyright Clearance Center has created a 6 1/2 minute video on copyright basics. It does a nice job quickly going over the facts and provides information in easy-to-understand language. Obviously, this is meant for people in corporations, but anyone can benefit from watching it.
One note, we always talk about documents from the U.S. federal government being in the public domain and that is true. However, documents from state and local governments may be protected by copyright. In addition, documents produced for the federal government by outside contractors may be protected by copyright. Therefore, don't assume that every government document is in the public domain.
URL updated 08/16/2013
Technorati tag: Copyright