Fair Use Definition

A copyright principle that excuses unauthorized uses of a work when used for a transformative purpose such as research, scholarship, parody, criticism, or journalism. When determining whether an infringement should be excused on the basis of fair use, a court will use several factors including the purpose and character of the use, amount and substantiality of the portion borrowed, and effect of the use on the market for the copyrighted material. Fair use is a defense rather than an affirmative right -- that is, a particular use only gets established as a fair use if the copyright owner decides to file a lawsuit and the court upholds the fair use defense.