As mentioned on the Copyright Essentials page, the U.S. Copyright Code permits usage of copyrighted works as long as that usage falls within the legal boundaries of what is considered fair by courts — in other words, "fair use." It's one of the most important concepts in copyright law! In judging whether a use is fair, courts weight four factors:
Each of these factors is discussed in more detail in the box at the lower left.
It's important to note that the factors are weighed together, as a whole. Not every criterion of the four must be satisfied in order for a finding of fair use. Use the box at the lower left, and the tools and links at the lower right, to obtain more information and perspective on this critical copyright issue.
Factor 1 — The Purpose of the Character of the Use — asks about how the copyrighted work is used, with educational, nonprofit or transformative purposes favoring a finding of fair use. It is, however, critical to note that a nonprofit or educational usage does not by itself mean that a usage is fair; the purpose of the use must be weighed with the other three factors.
Usages that favor fair use include:
Usages that oppose fair use include:
Factor 2 — the Nature of the Copyrighted Work — asks about what kinds of copyrighted works are in question, with certain kinds of works gaining favor for fair use over others.
Works that favor fair use include:
Works that oppose fair use include:
Factor 3 — The Amount and Substantiality of the Portion Used — looks at how much of the work has been used, and how central that portion is to the work.
It is important to note that the law provides no absolute numbers with regard to what can be considered fair use or not. The portion question must be weighed with the other three factors in making a claim or determination of fair use.
Favoring fair use:
Opposing fair use:
Factor 4 — The Effect of the Use Upon the Copyrighted Work's Market Value — asks whether the usage of a copyrighted work negatively impacts an actual or possible moneymaking opportunity for the copyright holder.
Favoring fair use:
Opposing fair use: