The doctine of “fair use" in U.S. Copyright law lists of the various purposes for which the reproduction of a particular work may be considered “fair,” such as criticism, comment, news reporting, teaching, scholarship, and research.
These uses are powerful, but not unrestricted. The guidelines below will help explain the restrictions on fair use.
Four factors must be considered when evaluating Fair Use. Each of the four factors must be weighed in order to determine fair use.*
1. PURPOSE: The purpose and character of the use, including whether such use is of a commercial nature or is for nonprofit educational purposes;
2. NATURE: The nature of the copyrighted work;
3. AMOUNT: The amount and substantiality of the portion used in relation to the copyrighted work as a whole;
4. MARKET: The effect of the use upon the potential market for or value of the copyrighted work.
TEACH = The Technology, Education and Copyright Harmonization Act of 2002