Using copyrighted works without permission of the copyright holder is possible under the
"fair use" doctrine. However, the fair use doctrine is a complex legal concept that allows for limited use of copyrighted material without permission for purposes such as criticism, comment, news reporting, teaching, scholarship, or research. The determination of whether a particular use of copyrighted material is fair use depends on several factors, including the purpose and character of the use, the nature of the copyrighted work, the amount and substantiality of the portion used, and the effect of the use on the potential market for or value of the copyrighted work.