User blog comment:Ausir/Bethesda and Mojang go to court over Scrolls/@comment-4521740-20111004131205/@comment-721-20111004205551

ZeniMax is the owner of Bethesda, and the lawsuit concerns a trademark to a Bethesda IP. While it might be ZeniMax in the strict sense, even Notch himself says "Bethesda", and it's not that big of a stretch.