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Fair use is an exception to the exclusive protection of copyright under American law. It permits certain limited uses without permission from the author or owner. The law's Fair Use Doctrine addresses educators' need to make copies and share copies of materials with their students. Use the four-factor test to determine fair use of a copyrighted work. Depending on the circumstances, copying may be considered "fair" for purposes such as teaching (including multiple copies for classroom use), scholarship, or research.
To determine whether a specific use under one of these categories is "fair," courts are required to consider the following factors:
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.
17 U.S. Code § 107 spells out four factors to determine if a use is fair. You must weigh each of these factors, no single factor is decisive. The ALA's fair use analysis tool will assist you with weighing the factors and will email you your choices so you'll have a record.