Well this had to happen, but not in the way it actually did. Blizzard sought to stop Valve from trademarking the “DOTA” name, associated with a custom map for its highly successful Warcraft III franchise that eventually broke off from its parent game and is being developed by Valve as DOTA 2. Blizzard, till now, had no problems with this since Valve was not taking anything that was explicitly its own to use – considering that DOTA was fan-made and fan-enjoyed from start to finish. However, Blizzard does have a problem with Valve trying to trademark the DOTA name.
The gist is that Blizzard never owned or wanted to own the DOTA name. It merely exuded goodwill to its fans and wishes to let the name be open and free for anyone to use. It’s a lot like the name “chess”. If Zynga decided to suddenly trademark the name “Chess” for one of its absurd Facebook games, it would look odd and many people will call foul. That is exactly what Blizzard is doing:-
By attempting to register the mark DOTA Valve seeks to appropriate the more than seven years of goodwill that Blizzard has developed in the mark DOTA and in its Warcraft 3 computer game and take for itself a name that has come to signify the product of years of time and energy expended by Blizzard and by fans of Warcraft 3. Valve has no right to the registration it seeks. If such registration is issued, it not only will damage Blizzard, but also the legions of Blizzard fans that have worked for years with Blizzard and its products, including by causing consumers to falsely believe that Valve’s products are affiliated, sponsored or endorsed by Blizzard and are related or connected to Warcraft 3.
This surprising turn of events also had a tow of die-hard Valve fans calling foul on Blizz because Valve Cannot Do Anything Wrong®