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- The four factors come from federal statute
- Factor one asks why and how the material is used
- Factor two considers the source work
- Factor three measures quantity and significance
- Factor four addresses market substitution and harm
- Technology cases still use the same statutory framework
- Common shortcuts produce unreliable answers
- Fair use differs from other copyright permissions
- Examples are comparisons, not guarantees
- A disciplined fair-use review makes uncertainty visible
- Sources
Key Facts
- Federal level: Fair use can permit an unlicensed use of copyrighted material, but the conclusion depends on the particular facts rather than a fixed word count or percentage.
- Federal level: Section 107 requires courts to consider purpose and character, the nature of the copyrighted work, the amount and substantiality used, and market effect.
- Federal level: Criticism, comment, news reporting, teaching, scholarship, and research are statutory examples of purposes that may qualify, not automatic exemptions.
- Federal level: A new meaning or message can matter, but the Supreme Court has emphasized that purpose, commercial character, and substitution must be evaluated in context.
- Federal level: Attribution, nonprofit status, or using only a small portion does not by itself establish fair use.
Fair use is a limitation on the exclusive rights granted by federal copyright law. It allows some uses of protected expression without the copyright owner’s permission. The doctrine is deliberately flexible because copying that advances criticism, learning, technology, or public discussion can look very different from one setting to another.
Flexibility does not mean that any socially useful use is fair. Courts weigh the statutory factors together, and no factor supplies a universal shortcut. The same excerpt may be fair in one context and infringing in another because the purpose, presentation, amount, audience, and market consequences differ.
The four factors come from federal statute
Section 107 of the Copyright Act identifies four mandatory, nonexclusive factors. Courts consider the purpose and character of the use, including its commercial or nonprofit educational character; the nature of the copyrighted work; the amount and substantiality used in relation to the work as a whole; and the effect on the potential market for or value of the work.
The statute also names criticism, comment, news reporting, teaching, scholarship, and research as examples of purposes that may support fair use. Those labels begin the inquiry rather than end it. A commercial review can be fair, while copying placed in an educational setting can still fail when the surrounding circumstances weigh against it.
Factor one asks why and how the material is used
The first factor examines the purpose and character of the challenged use. A court may ask whether the use serves a further purpose or has a different character from the original, whether it adds new expression or meaning, whether it substitutes for the original, and whether it is commercial.
Transformative use is not a separate fifth factor or an automatic defense. In Andy Warhol Foundation v. Goldsmith, the Supreme Court focused on the specific use alleged to infringe: licensing a Warhol image to illustrate a magazine story about the musician Prince. The Court concluded that this commercial licensing purpose was substantially similar to the photographer’s licensing purpose, and factor one favored the photographer for that challenged use.
The Warhol decision also shows why an artwork cannot be classified as fair or unfair in the abstract. A work may have new expression, yet a particular commercial use of it can occupy the same market role as the source image. The analysis remains tied to the use actually at issue.
Factor two considers the source work
The second factor evaluates the nature of the copyrighted work. Use of factual or informational material may receive more favorable treatment than copying from a highly creative work because copyright’s protection is strongest around original expression rather than facts or ideas.
Publication status can also matter. Section 107 states that an unpublished work is not automatically excluded from fair use, but courts may consider an author’s interest in controlling the first public appearance of expressive material. Factor two often carries less weight than the purpose and market inquiries, but it remains part of the required analysis.
Factor three measures quantity and significance
The third factor examines both how much was taken and how important the selected material was to the original. Copying a small but central portion can weigh against fair use, while copying an entire work can sometimes be justified when the new purpose reasonably requires it.
There is no safe percentage, number of seconds, word count, or page limit in Section 107. The practical question is whether the amount used is reasonable in relation to the asserted purpose. Material unrelated to that purpose can make the justification weaker.
Factor four addresses market substitution and harm
The fourth factor considers the effect of the use on the potential market for or value of the copyrighted work. Courts look for substitution in existing markets and for harm to traditional, reasonable, or likely-to-develop licensing markets.
Not every lost licensing fee proves market harm because copyright owners cannot define a market merely by demanding payment for uses that are otherwise fair. At the same time, widespread copying that replaces purchases or licenses can weigh strongly against fair use. Courts consider the likely effect if similar conduct became common, not only the revenue associated with one copy.
Technology cases still use the same statutory framework
Google LLC v. Oracle America involved copying portions of software interface code into a new smartphone platform. The Supreme Court assumed for argument that the code was copyrightable and held that the specific copying was fair use. Its analysis emphasized the functional nature of the declaring code, the programmers’ accumulated knowledge, the amount used in context, and the different computing environment created by the new platform.
Google did not create a general rule that software copying is fair. It applied the statutory factors to a particular kind of computer code and a particular technological purpose. Later disputes still require attention to what was copied, why it was copied, and how the new use relates to existing and potential markets.
Common shortcuts produce unreliable answers
Giving credit is often appropriate, but attribution is not a substitute for permission and does not establish fair use. A copyright notice or a statement such as “no infringement intended” does not change the four-factor analysis.
Nonprofit and educational purposes can support factor one, but they do not automatically control the result. Commercial use can weigh against fair use without ending the inquiry. Likewise, the absence of direct profit does not make every use noncommercial.
Using material found online does not make it public domain. Public accessibility and copyright status are separate questions. A work can be easy to download while remaining protected.
The same distinction appears in this discussion of archive photographs and copyright risk, where the ability to locate an image does not answer whether reuse is authorized.
Fair use differs from other copyright permissions
Fair use is only one reason a use may be lawful. A work may be in the public domain, a license may authorize the activity, the copyright owner may have granted permission, or another statutory limitation may apply.
Creative Commons and similar licenses depend on their stated conditions. Compliance with a license avoids the need to rely on fair use for conduct the license authorizes. Exceeding a license does not automatically eliminate a possible fair-use argument, but it changes the legal path that must be analyzed.
Examples are comparisons, not guarantees
The U.S. Copyright Office maintains a Fair Use Index summarizing decisions across courts and categories. The index can reveal patterns involving commentary, photographs, education, software, digitization, music, and parody. It is a research aid rather than a substitute for reading controlling opinions or analyzing a new set of facts.
Examples are most useful when the purpose, type of work, amount, presentation, and market are genuinely comparable. A result involving search indexing may offer little guidance for decorative reuse of a photograph. A parody decision may not resolve a use that merely borrows a recognizable style or subject.
A disciplined fair-use review makes uncertainty visible
A structured review identifies the exact source work, the material taken, the audience, the new purpose, the way the copy is presented, and the markets affected. It then addresses all four statutory factors without treating favorable facts as conclusive.
The strongest analysis also distinguishes facts from assumptions. Market evidence, licensing practices, publication history, and the amount actually used can change the balance. When information is missing, the uncertainty belongs in the conclusion rather than being replaced with a numerical score.
Fair use ultimately remains a fact-specific federal doctrine. The four factors provide a shared framework, while statutes and judicial decisions supply the boundaries. That combination explains both the doctrine’s value and why simple online rules cannot predict every outcome.
