Fair use is determined by the following:
For more information regarding fair use and application of these factors, see the U.S. Copyright Office’s More Information on Fair Use page. The Copyright Office has also published a circular on the Reproduction of Copyrighted Works by Educators and Librarians, which may be helpful for fair use analysis.
This video from Copyright Clearance Center is part of a "Copyright Answers" series of videos on copyright-related topics. For more copyright information, visit www.copyright.com/Learn.