A battle worth of the Defense of the Ancients (DotA) is taking place between Blizzard, Riot and Valve, the former are not happy with Valves application for a trademark on DotA, which went in on the 16th November 2011. The problem here is that each party have developed games and websites based on DotA, which is going to be a nightmare to sort out, unless they all manage to come to some agreement.
According to the some reports, this is what it is all about;
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 is one battle that is just going to get nasty, take a long time to resolve and cost a fortune in the process.
Source [Video Game Writers]