Blizzard has always taken an uncompromising attitude towards cheats in its games; it has already issued lifetime bans to thousands of players caught using hacks within weeks of the release of its new shooter Overwatch—even if they make new accounts or buy new copies of the game—and now it’s going after the company that makes those cheats possible.

Blizzard has filed a lawsuit in California against Bossland GMBH, the German company behind Watchover Tyrant, a programme which allows all sorts of unpleasant and unsporting cheating shenanigans. Those include a radar that shows where enemies are, and aiming assistance. Bossland has made cheat programmes for most of Blizzard’s other games, and the American firm is accusing its longtime rival of copyright infringement, unfair competition, and violation of the DMCA’s anti-circumvention provision.