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A legal principle limiting the exclusive rights of copyright holders. In general, the “Fair Use” of a copyrighted work includes use for purposes such as criticism, comment, news reporting, teaching, scholarship, or research. Because the Copyright Act does not specifically define Fair Use, the concept and practice of Fair Use may be subject to legal challenge and judicial interpretation. Courts typically balance the purpose and character of the use; the nature of the copyrighted work; the amount and substantiality of the portion used in relation to the copyrighted work as a whole; and the effect of the use on the potential market for, or value of, the copyrighted work.