This document discusses several topics relating to copyright and fair use of copyrighted materials. It defines public domain as works whose intellectual property rights have expired, been forfeited, or are otherwise inapplicable. It also defines orphan works as works that are difficult to find the author for, posing risks and limiting the digital marketplace. The document discusses when copyrighted materials can be used under fair use principles and provides guidelines for determining fair use. It notes that fair use is a limitation on exclusive copyrights and allows use of portions of a work for purposes like commentary or research. Web resources are provided for determining copyright status and fair use.