Cadaverino wrote:
If it were in a court today, Lichtenstein would probably win with a "fair use" defense. Courts today look on such a use in fine art as transformative rather than derivative. Blanch v. Koons, 467 F. 3d 244 (C.A.2, 2006).
Here's an example of Roy Lichtenstein's "transformative" use of DC's copyrighted artwork at this link:

http://www.dialbforblog.com/archives/381/