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Copyright is implicit. That is the crux of the issue from a legal standpoint.

I can make anything and make it available with modify permissions - it is still under copyright though by my use of permissions I have allowed derivative works. While I could turn around and say that people who create derivative works are infringing, it is a very weak case since my actions allowed the use - one could say consciously (the default permission is no modify - it would have to be changed).

Again, I'll say this: Copyright is implicit. Registering the copyright makes for easier court cases, but - the copyright system in the context of virtual objects might be very interesting indeed. To be done properly, it would take a lot of data indeed - prim sizes, rotations, much more. Then textures, etc. Then scripts, etc. Then the prims relative positions in linked objects. Then...

Copyright is still implicit. While companies should register copyrights (especially BEFORE alleged abuse happens), there is room for maneuvering if this did not happen.

Trademarks, on the other hand - right out.