What is copyright infringement? Are there any defenses?
Infringement occurs whenever someone who is not the copyright holder (or a licensee of the copyright holder) exercises one of the exclusive rights listed above. The most common defense to an infringement claim is “fair use,” a doctrine that allows people to use copyrighted material without permission in certain situations, such as quotations in a book review. To evaluate fair use of copyrighted material, the courts consider four factors: • the purpose and character of the use • the nature of the copyrighted work • the amount and substantiality of copying, and • the market effect. (17 U.S.C. 107) The most significant factor in this analysis is the fourth, effect on the market. If a copier’s use supplants demand for the original work, then it will be very difficult for him or her to claim fair use. On the other hand, if the use does not compete with the original, for example because it is a parody, criticism, or news report, it is more likely to be permitted as “fair use.” Trademarks are
