Fair Use allows limited use of copyrighted materials for educational and research purposes. The statute outlines four factors that should be assessed in determining whether a use is a Fair Use. These are:
- the purpose and character of your use
- the nature of the copyrighted work
- the amount and substantiality of the portion taken, and
- the effect of the use upon the potential market.
The test is, intentionally, fact dependent, so you need to look at each use individually to determine if it is a fair use.
Stanford’s Copyright & Fair Use site (http://fairuse.stanford.edu) provides much more detail on fair use, its application, and relevant case law.