Mark Twain believed that God would find no sense in any copyright law. Copyright laws were created to protect the intellectual property rights of authors and inventors by giving them limited exclusive control over their works. Copyright protects published works, online content, articles, lesson plans, music, art, video and other creative works but not facts, ideas, data, logos or expired works. Fair use allows limited use of copyrighted works for purposes like criticism, commentary, news reporting, teaching, scholarship or research based on factors such as the purpose of the use, amount of the work used, and the impact on the work's potential market. Proper use of copyrighted material requires determining if use is allowed under fair use or other guidelines