Pop Art copyright

Pop Art Portraits is an exhibition currently at the National Portrait Gallery:

Apparently [the artists] cut up magazines, copied comic books, drew trademarked cartoon characters like Minnie Mouse, reproduced covers from Time magazine, made ironic use of a cartoon Charles Atlas, painted over iconic photos of James Dean and Elvis Presley – and that’s just in the first of seven rooms.

Be careful, though:

There is, however, another message about copyright in the National Portrait Gallery: it is implicit in the “No Photography” signs prominently displayed throughout its rooms, including one by the entrance to the Pop Art Portraits exhibition.

Cory Doctorow, writer of the above, thinks Andy Warhol would be turning in his grave. Hard to disagree.