Copyright is the exclusive right granted by Congress to the author or originator over his/her work for a certain period of time, generally, lifetime plus 70 years.
Fair use is the judicial doctrine in the U.S. Copyright Law (Section 107) which allows limited copying or use of copyrighted works in teaching, scholarship, and research situations without the permission of the copyright holder.
How do I know if I'm not violating copyright and within the limitations of fair use?
Use these guidelines:
For more frequently-asked-questions regarding copyright, fair use, and other issues surrounding intellectual property, Click Here.