Copyright also does not prohibit all forms of copying. In the United States, the fair use clause of the Copyright Act (17 U.S.C. Section 107) allows copying and distribution when done fairly. The statute does not clearly define fair use, but examples of fair use are given, and four non-exclusive factors are offered for a fair use analysis. Copyrighted works may also be available for copying through a statutory compulsory license scheme or via a copyright collective or performing rights organisation such as ASCAP or BMI.