The doctrine of "fair use" refers to Section 107 of U.S. Copyright law. It places a limitation on the copyright holders rights, and allows consumers to copy part (or all) of a copyrighted work in certain circumstances, based on one of the following "Four Factors:"
- the purpose and character of the use (is it for commercial, or for non-profit, educational purposes?)
- the nature of the copyrighted work
- the amount and substantiality of the portion used
- the effect of the use on the potential market for or value of the copyrighted work