The cold war between a startup and a soft-serve machine manufacturer is heating up, thanks to a newly released trove of internal emails.

SIX MONTHS AGO, a tiny startup called Kytch sued Taylor, the billion-dollar manufacturer of McDonald's notoriously broken ice cream machines. For years Kytch had sold a small device that hacks those ice cream machines, letting McDonald's restaurant owners better diagnose their maladies and make them work more reliably—only to find, according to Kytch's legal complaint, that Taylor had conspired to copy its device and sabotage its business.

Now Kytch's lawsuit has revealed another side to that story: the internal communications of Taylor itself. Recently released court documents appear to show that Taylor's executives did view Kytch as a business threat and worked to copy its device's features in a competing product—all while still failing to actually cure McDonald's ice cream headaches.