However Blizzard is not too happy about Valve using the name DOTA and is now seeking the prevention of its use. They are claiming that “by attempting to register the mark DOTA, Valve seeks to appropriate the more than seven years of goodwill that Blizzard has developed”, and that the DOTA name is “a name that has come to signify the product of years of time and energy expended by Blizzard and by fans of Warcraft III”.
Considering that a good many DOTA 2 players will more than likely be fans and players of the original DOTA, wouldn’t Blizzard sort of be stepping on their toes by hampering the launch of DOTA 2? We’re not sure how Valve will respond, but for more information (if you can be bothered to comb through the legalese) check out Blizzard’s opposition filed with the USPTO.