Copyright protects original works of authorship including literary, dramatic, musical, artistic, and certain other intellectual works. It refers to creations of the mind such as inventions, literary and artistic works, designs, and symbols. Works in the public domain are not copyrighted and can be used without permission but the source should be credited. Fair use allows the use of a small amount of copyrighted material for educational purposes if it has an educational purpose, does not deprive the author of money, and uses a limited portion of the work. The TEACH Act expands educators' rights to perform, display, and make copies of copyrighted works for digital distance education.