Fair use is a legal doctrine that allows for limited use of copyrighted material in certain circumstances. It involves consideration of four factors, as outlined in 17 U.S.C. §107 and expanded upon in the various court cases (see below) that have applied and interpreted the law. Determining whether a use is fair (and therefore not infringing) must be done on a case-by-case basis dependent on the particular facts. To get a definitive answer about whether something is a fair use requires resolution in a federal court, but in most cases, you can rely on best practices and checklists that apply the four factors to a known set of facts.
17 U.S.C. §107 tells us that "the fair use of a copyrighted work...for purposes such as criticism, comment, news reporting, teaching (including multiple copies for classroom use), scholarship, or research, is not an infringement of copyright."
To determine whether your intended use of a copyrighted work is a fair use, you should weigh the following considerations:
A recent trend in the courts considers the concept of transformativeness. If your use significantly transforms the work (such as use for criticism, scholarship, or parody), or the purpose of the work (such as social work students examining a workbook actually intended in the general market for patient/client use), this transformativeness will likely affect the fair use argument favorably.
It is important to remember that all four factors must be considered together; no single factor controls the strength of the argument. In using copyrighted work in your courses, you will often be able to claim a fair purpose (i.e., teaching, scholarship, criticism), but you still must consider the nature of the work, the amount you intend to use, and the effect on the potential market for the copyrighted work. It is always a good idea to document your consideration of the four Fair Use factors at the time of your use of the work and retain for your records; doing so demonstrates your good faith effort to comply with copyright law.
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