I agree that asking permission is just good manners. Thing is, Warhol's entire output is based on copying; not having obtained permission is a large part of th

I agree that asking permission is just good manners. Thing is, Warhol's entire output is based on copying; not having obtained permission is a large part of the point. I'm no art critic - I'm a phillistine - but I think one way of interpreting his work is as a commentary on copying.