Artists build on other artists’ work. So the Warhol Foundation has a double standard when it comes to the use of Warhol’s work. The Warhol Foundation is “vigorous in enforcing our rights when it comes to people wanting to use Warhol’s art for commercial purposes,” Wachs said. But when it comes to artists and scholars, the rules are very different. “We permit artists to use and reference Warhol work without charge and without challenge.” And “we let scholars use Warhol imagery for just a nominal fee to cover the cost of administering the rights.”