[citation][nom]xerroz[/nom]Blizzard's Warcraft 3 Map editor clearly states in the EULA that anything made or used in the map editor is property of Blizzard and can be claimed as such. Therefore Valve (who are being nothing by opportunists by making Dota 2 in the first place) shouldn't have a case in the matter.[/citation]
Well, for one, Blizzard doesn't own the name DOTA, or the whole Trademark issue wouldn't exist in the first place. It would already belong to Blizzard.
They can "own" the specific version of DOTA running on their engine/software. They do not, however, own the name or, again, the TM would already be theirs and it would be a non-issue.
Third, you say VALVe are being nothing but opportunists since they are making DOTA 2. Well, from my understanding, DOTA2 was being made *anyway*. VALVe saw an opportunity in bringing more talented designers/developers into their fold - just as they have in the past with Portal, etc. This brings several variables into it that I think are worth mentioning.
1. The designers/developers of DOTA2 are now being *paid* to do what they do. VALVe is investing in these people and paying them a salary to work as professional game developers.
By contrast, Blizzard was happy to sit back and reap the benefits of people buying WC3, in order to play something that wasn't of their invention (DOTA).
Blizzard could have hired these people on. But they didn't. They've been content to sit back and get the milk for free. VALVe, meanwhile, has invested in DOTA and its creators, in the form of full-time jobs and the support of their own team of designers and developers within VALVe to create and support the product.
So, I think you have it backwards. Blizzard have been the opportunists for the past seven years, happily getting the milk for free. VALVe are the ones actually rewarding DOTA/DOTA2's creators by investing in them, and their concept.
2. The name, Defense of The Ancients, belongs to its creators - not to Blizzard. Blizzard owns the content and the engine. Not the name. Again, if that were the case, the whole TM thing would not be an issue to begin with.
Blizzard reaped all the benefits of DOTA, but never invested a dime in compensating those people for the years of work they did on it.
VALVe is investing in it and putting actual money, resources and man-hours into the project. If anyone deserves to have the TM, it's VALVe, if the creators of DOTA wish to have it that way.