Dota 2 is a stand-alone sequel to the Warcraft III Defense of the Ancients custom map and its various offshoots being developed by Valve. While Dota has been used unofficially as the abbreviation for "Defense of the Ancients", but Valve as attempted to register it as a trademark.
- ^ DOTA. Trademark Electronic Search System (TESS at USPTO.gov). Retrieved on 2011-08-31.
- ^ Brian Crecente 2011-08-30. Can Valve Really Make a Sequel For a Game They Didn’t Create?. Kotaku.com. "We talk to the Blizzard guys all of the time, I think the main thing is that like Valve, Blizzard wants to make sure that customers are being taken care of." - Gabe Newell (Valve co-founder)