I've told people that I think copyrights and patents are like control rods in the fission reaction of human intelligence, where the "explosion" being prevented is hopefully one of goodness, as opposed to destruction. Perhaps another analogy would be better.
In any case, one of my main problems with copyrights and patents is that I don't think human brains are good at knowing where ideas came from, and trying to keep track of that reduces the efficiency of thought and creativity. I feel like people would be better problem solvers if they didn't need to second guess all of their solutions to make sure that they didn't violate any patents or copyrights.
I think I've said this before, but whatever. I'm saying it again.