Fair Use

In no more than 1 to 1.5 pages, write what the U.S. Supreme Court in the Campbell v. Acuff-Rose Music case said the concept of “Fair Use” is

(how would you define it?), what the elements of fair use are, and what each of those elements mean (how would you describe each of these

elements?).
The eassy must be based on this article http://caselaw.findlaw.com/us-supreme-court/510/569.html