I think copyright has two issues:on the one hand, it's a monopoly enforced by the state on the other, information wants to be free (atoms have owners because they can't be copied, bits can't have owners because copying is almost free)
So, how do we set up a good system of attribution and reward?
I think that the answer comes from social proof and linkability through the blockchain.
One of the main things I've been thinking lately is that Decentraland is an identity system, where coordinates are your credentials. You set up your city at coordinates (X, Y) -- and somebody takes your creation, modifies it a little bit and copies that in (A, B ).
If you live by donations in a patreon-like style, you could start a media campaign pointing to the transaction in the blockchain that set your creation in X,Y before A,B
If you are an item creator, I should be able to say "this is an original @AUTHOR -- look, here's his cryptographic signature". This is extremely easy to do in the blockchain, just set up a name registry, and owneables on chain. The key part is the UX around this. If I directly can do something like press Alt + hover on some random Z person's item and I see "original by @AUTHOR, licensed to Z" cool, I know that's legit
Another similar issue arises with online games. If I create a really good casino game, and someone copies it but places it in a better location, I get no benefit from that. So I guess this is what really has the potential to make land and co-location valuable.