If you look at the parent I think agreement on the patent issue is implied. Certainly patent damage is more obvious and is more important in terms of the advancement of technology and increased standard of living.
But that doesn't mean copyrights don't stifle cultural innovation. It's just that most people don't care as much about the cultural stuff. O Fortuna is a particularly good example because the words to which Orff set his music were in the public domain, having been written centuries ago. His work could not have been created if the poem was still under copyright.