Fair use is the rule that some unlicensed copying of a copyrighted work is lawful, codified at 17 U.S.C. § 107. It is not a permission you apply for and not a category of content that is exempt in advance. It is an affirmative defense, decided one case at a time by a court weighing four statutory factors, which means the person invoking it concedes the copying and then argues it should be excused.
That structure explains most of what people find frustrating about it. There is no form, no threshold, and no bright line. The statute names four factors that courts “shall include” in the analysis, and Campbell directs that “all are to be explored, and the results weighed together, in light of the purposes of copyright,” so the answer to almost every fair use question begins with the facts and not with a rule.
Section 107 lists them, and the preamble offers illustrative purposes: criticism, comment, news reporting, teaching, scholarship, and research. Those are examples, not a checklist. Falling inside one does not win, and falling outside all of them does not lose.
Courts do not tally the factors two to two and call it a tie. They weigh them in light of copyright’s purpose, and factors one and four do the overwhelming share of the work.
This is the misconception worth killing. Campbell v. Acuff-Rose Music (1994), the 2 Live Crew parody case, asked whether a new work “adds something new, with a further purpose or different character,” and the word transformative escaped the opinion and became folk law. For nearly thirty years people treated it as a switch: change it enough and you win.
Andy Warhol Foundation v. Goldsmith, 598 U.S. 508 (2023), corrected that. Warhol had silkscreened Lynn Goldsmith’s photograph of Prince, and the Foundation later licensed one of those images to a magazine to illustrate an article about Prince. The Court held factor one favored Goldsmith. The Warhol image undeniably added new expression, but licensing it as a magazine illustration of Prince served substantially the same purpose as licensing Goldsmith’s photograph as a magazine illustration of Prince, and it was commercial. Same use, same market, direct substitution.
The reframing matters: factor one no longer asks “is this different,” it asks whether the degree of difference is enough, weighed against commercialism, to justify copying this work rather than paying for it. Parody survives because it must conjure the original to comment on it. Satire that uses a famous work merely to get attention has a weaker claim, because the copying is not necessary to the point being made.
Harper & Row v. Nation Enterprises, 471 U.S. 539 (1985), called factor four “undoubtedly the single most important element.” The Nation had scooped an authorized serialization by quoting roughly 300 words from Gerald Ford’s unpublished memoir, including his account of pardoning Nixon. Small excerpt, factual work, news reporting purpose, and still infringement: the taking was the heart of the book, the work was unpublished, and Time, which had contracted for $25,000 to run a prepublication excerpt, cancelled its article and refused to pay the remaining $12,500 as a direct result.
The Court has since softened the “most important” framing. Campbell rejected any presumption that commercial use harms the market and told courts to weigh all four factors together. But factor four still tends to decide close cases, because it is where the substitution question lives. Note its circularity, which courts acknowledge: every unlicensed use arguably harms a licensing market, since the owner could always have charged. Courts limit this by asking about traditional, reasonable, or likely to be developed markets, not every conceivable one.
Google LLC v. Oracle America, 593 U.S. 1 (2021), shows how much the framework tolerates when the facts line up. Google copied about 11,500 lines of Java SE declaring code verbatim into Android. That is an enormous literal taking, done by one of the most commercial actors alive, and the Court still found fair use.
The reasoning tracked the factors precisely. Factor two: declaring code is functional and organizational, far from the core of copyright, so it weighed for Google. Factor three: 11,500 lines was 0.4 percent of the relevant code, taken to let programmers reuse skills they already had. Factor one: reimplementing an interface in a new platform was a distinct purpose. Factor four: Sun, Java’s original owner, had already tried and failed to build a smartphone platform, and the Court found Android’s market was not one Sun or Oracle was positioned to occupy.
Set Google next to Harper & Row and the lesson is unmistakable. Three hundred words lost; eleven thousand lines won. Volume is not the variable.
Fair use is a defense, so it is decided by a judge or jury after a lawsuit exists. There is no registry, no advance ruling, and no pre-clearance. That is a deliberate design choice: § 107 was drafted to codify an equitable, flexible doctrine that the courts had been developing since Folsom v. Marsh in 1841, precisely so it could handle technologies the drafters could not foresee. Flexibility and predictability are the same trade running in opposite directions.
The practical consequences follow. The rules of thumb circulating online, 10 percent, 30 seconds, eight bars, “it’s fine if I credit the source,” “it’s fine if I’m not making money,” “it’s fine if I don’t run ads,” have no legal basis. Attribution is not a factor. Nonprofit status weighs slightly in factor one and nothing more. A takedown or a platform strike is a private contract decision, not an adjudication of fair use.
One real protection does exist: 17 U.S.C. § 504(c)(2) requires a court to remit statutory damages entirely where an employee of a nonprofit educational institution, library, or archive reproduced a work believing reasonably that the use was fair. That is narrow, and it does not reach most people who ask.
What is fair use? Fair use is a doctrine in 17 U.S.C. § 107 that permits unlicensed use of copyrighted material in some circumstances. Courts weigh four factors: the purpose and character of the use, the nature of the copied work, the amount and substantiality taken, and the effect on the market for the original. It is an affirmative defense, which means it excuses conduct that would otherwise be infringement, and the person claiming it carries the burden.
What are the four factors of fair use? First, the purpose and character of the use, including whether it is commercial and whether it adds something new with a further purpose. Second, the nature of the copyrighted work, meaning how creative or factual it is. Third, the amount and substantiality of the portion used relative to the whole. Fourth, the effect of the use upon the potential market for or value of the copyrighted work. All four are weighed together, and no single one is decisive.
Does transformative use automatically make something fair use? No. Transformativeness is one consideration inside factor one, not a standalone pass. In Andy Warhol Foundation v. Goldsmith (2023) the Supreme Court held that adding new expression or meaning is not enough when the copy serves substantially the same purpose as the original and is commercial. The question is whether the use has a justification for copying, not merely whether it looks different.
How much can I copy under fair use? There is no safe amount. The often repeated 10 percent, 30 second, and eight bar rules appear nowhere in the statute or the case law. Harper & Row found infringement where roughly 300 words were quoted from a book manuscript because the excerpt was the heart of the work, while Google v. Oracle found fair use for about 11,500 lines of copied code. Substantiality matters more than word count.
Going further: Is your use fair? A step-by-step assessment .
This page is general legal information, not legal advice, and it does not create an attorney-client relationship.
The Second Circuit held reduced-size Grateful Dead posters in a band biography were transformative fair use, and lost license fees alone were not market harm.
The Eleventh Circuit held The Wind Done Gone was a protected parody of Gone With the Wind and vacated its injunction as an unconstitutional prior restraint.
The Second Circuit held that scanning print books and lending the digital copies, even one-to-one, is not fair use. The decision turns on a narrowed conception of transformative use and the primacy of the licensing market.
By a single vote, the Supreme Court held that taping a show to watch later is fair use and that selling VCRs is not contributory infringement, protecting copying technology for a generation.
The Ninth Circuit held that a Star Trek-Seuss mashup was infringement, not parody, drawing a hard line between transformation and clever copying.
The Second Circuit held that Google's scanning of millions of books to create a searchable index and display brief snippets is a transformative, noninfringing fair use.
The Second Circuit held that Jeff Koons's 'String of Puppies' sculpture infringed Art Rogers's photograph and rejected the parody defense because Koons did not target the original work itself.
The Second Circuit held that libraries' mass digitization of books for full-text search and access for the print-disabled is a transformative, noninfringing fair use.
The Supreme Court held that a magazine's scoop of 300 verbatim words from Gerald Ford's unpublished memoir was not fair use, making market harm the most important factor.
The Second Circuit held that appropriation art can be transformative fair use even without commenting on the original, then left five works in doubt.
How the Supreme Court rescued 2 Live Crew's send-up of 'Oh, Pretty Woman' and rewrote the four-factor fair-use test around transformation.
