ViRGE wrote on Feb 10, 2012, 11:03: No more than AutoDesk owns Transformers because 3dsMax was used to assemble the models. Being the toolmaker confers no ownership of the finished product (unless there's a contract stating otherwise, i.e. the free version of Unreal Engine 3).
Blizzard certainly has no standing to own the DotA trademark. The only party that has any standing is Valve, and even then it's not immediately clear that they should get it.
I'd assume that it'd depend on the Warcraft 3 map editor EULA?