Bethesda has accused Minecraft creator Markus "Notch" Persson of infringing an Elder Scrolls trademark.
Scrolls is Notch and his studio Mojang's Minecraft follow up. The fantasy-based interactive collectible card game, which is without a release date, places an emphasis on strategy and tactics.
"Just got a letter from Bethesta's [sic] lawyers," Notch wrote on Twitter. "They claim 'Scrolls' infringes on their trademark and everyone will confuse it with Skyrim."
Bethesda's The Elder Scrolls V: Skyrim, due out in November, is currently being shown to press at QuakeCon in the US.
Notch also published a picture of the 15-page cease and desist letter, which details the alleged trademark infringement.
"I still <3 Bethesda," he said. "This is hopefully just lawyers being lawyers."
Bethesda issued Eurogamer with a "no comment" on the matter this afternoon.