The two companies reached a legal agreement concerning Valve's DOTA II and Blizzard's fan-made Warcraft III and Starcraft II fan made multiplayer content. Valve will continue to use DOTA commercially for their upcoming games while Blizzard will only use it for the aforementioned player created content.
"We're pleased that we could come to an agreement with Blizzard without drawing things out in a way that would benefit no one," said Gabe Newell, president and co-founder of Valve. "We both want to focus on the things our fans care about, creating and shipping great games for our communities."
The companies are not planning on discussing the legal details of the agreement beyond today's announcement.