Why isn't "Pop Art" a copyright violation? - Yahoo! Answers

Under Fair Use policies of the United States, fair use only applies for 1) criticism 2) commentary 3) news reporting 4) teaching and scholarship 5) research The supreme court has also ruled that any artwork that reproduces another for a commercial use (ie sale) cannot be taken under the Fair Use doctrine. Yet artists like Larry Rivers and Andy Warhol take blatantly from images owned by museums and other artists and photographers.