@Saeadame

What you might be missing is that Valve employs the current developer of DOTA. In other words, Valve is applying for the trademark with the blessings of the current DOTA developer.

It's not simply a matter of Valve trying to profit from someone's else work. Valve offered the current DOTA developer a place to be, funding, and the chance to launch a new version of his game under the Valve label. Of course, there is money to be made, but the DOTA developer is getting what he most likely considers a fair cut - otherwise, he wouldn't be on board with Valve.

So, IMHO, the only parties that have any legitimacy to block the trademark are the previous DOTA developers, the people that actually created and used the name before IceFrog became the developer.

Blizzard trying to block the DOTA trademark strikes me as just a greedy company trying to prevent a developer from benefiting from his own work, from enjoying the exclusivity creators are entitled to by the law. Blizzard seems to want a free ride on DOTA's success, down to using the DOTA name, without having to pay anything to it's creators.