Other than the D&D name itself (and the D&D ruleset of course), there isn't a lot of valuable IPs in there. Elves and orcs are open to everyone, and even one of the big iconics of D&D, the Mind Flayer, has been freely used by Square since the very first Final Fantasy game. The core concept of D&D, a bunch of people going on an adventure in a fantastic world, is not exclusive to D&D at all. Unless a computer developer wants to make a game using the D&D rules (a questionable endeavor, really, and certainly not necessary), then the D&D brand name is useless. It might be the worst kind of license for a game developer. Sure, settings like the Forgotten Realms have proven to be valuable, but I don't think that is equated with the value of the D&D brand.