This document provides an overview of copyright including what is and is not protected, how long copyright lasts, fair use, and obtaining permission. Copyright protects original works fixed in a tangible medium including literary works, music, art, films, and software. Copyright infringement is the unauthorized use of copyrighted works. Fair use allows limited use for purposes such as teaching, research, news reporting, and criticism. Factors in determining fair use include the purpose of the use, nature of the work, amount used, and effect on the market. Obtaining permission is required for commercial use or using an entire work.