§ 107. Limitations on exclusive rights: Fair use
Notwithstanding the provisions of sections 106 and 106A, the fair use of a copyrighted work, including such use by reproduction in copies or phonorecords or by any other means specified by that section, for purposes such as criticism, comment, news reporting, teaching (including multiple copies for classroom use), scholarship, or research, is not an infringement of copyright. In determining whether the use made of a work in any particular case is a fair use the factors to be considered shall include —
(1) the purpose and character of the use, including whether such use is of a commercial nature or is for nonprofit educational purposes;
(2) the nature of the copyrighted work;
(3) the amount and substantiality of the portion used in relation to the copyrighted work as a whole; and
(4) the effect of the use upon the potential market for or value of the copyrighted work.
The fact that a work is unpublished shall not itself bar a finding of fair use if such finding is made upon consideration of all the above factors.
What is Fair Use?
The "fair use" doctrine embodied in the Fair-Use Statute Chapter 1, Section 107 of the 1976 Copyright Act, allows reproduction and other uses of copyrighted works under certain conditions for purposes such as criticism, comment, news reporting, teaching (including multiple copies for classroom use), scholarship or research for educational and research purposes.
Understanding the Four Factors of Fair Use
The fair use provision may be applied to the use of all copyrighted works, even those in digital form. To determine whether any particular use is a fair use, you should conduct a case-by-case analysis based on the factors below.
First Factor: Purpose and Character of the Use
Nonprofit, educational, and personal uses are generally favored fair uses while commercial uses are less likely to be deemed fair use. Although educational use in and of itself will not assure that your use is a fair use, by the same token not every commercial use will fail as a fair use. Transformative uses, uses that result in the creation of a new work, with a new purpose and different character are favored as fair uses over uses that merely reproduce an original work. The more transformative a particular use is the less significant the other factors will be as they weigh against fair use.
Second Factor: The Nature of the Copyrighted Work
Factual works, published works and scientific articles that are factual in nature are more likely to be considered available for fair use than are creative, imaginative, artistic, or unpublished works. Additionally certain "consumable" works, e.g. workbooks and standardized tests are not likely to be considered available for fair use.
Third Factor: Amount and Substantiality of the Portion Used
The statute gives no bright line indication concerning how much of a work may be used under fair use but the implication is that use of the whole work is less likely to be considered a fair use. Thus, use of only a small portion of a work is favored. However in some circumstance e.g. uses like research, classroom use, personal use that already weigh in favor of fair use, you may use more of a work. In fact in such cases use of the entire work may be appropriate and allowable as a fair use if using that much is required to accomplish your purpose. A commercial use of the same material in the same amount could weigh heavily against fair use. Amount and substantiality is also a qualitative measure and at times use of even a small portion of a work may be considered too much to qualify as a fair use if that portion used is considered to be the "heart of the work."
Fourth Factor: Effect on the Potential Market for or Value of the Work
Generally the consideration for this factor is whether or not there is some economic harm to the owner of the copyright as a result of your use. Courts have established the availability of permissions or licenses as one of the potential values for copyrighted works. This factor alone, however, cannot determine whether or not a use is fair. Positioned as the fourth factor it is a bit easier to consider market effects. If the first three factors weigh in favor of fair use then market harm should carry less weight even when considering the permissions market, since the market is for permissions that are required. Conversely, if the first three factors are tipping the balance in favor of permission then market harm will carry more weight in the balancing of the factors.