合理使用
Fair use is the use of limited amounts of copyrighted material in such a way as to not be an infringement. It is codified at , and states that "the fair use of a copyrighted work ... is not an infringement of copyright." The section lists four factors that must be assessed to determine whether a particular use is fair. There are no bright-line rules regarding fair use and each determination is made on an individualized case-by-case basis.