You should talk to a lawyer, not a sysadmin, because your remedy is going to be contractual rather than technological. Technologists thinking rationally will t

You should talk to a lawyer, not a sysadmin, because your remedy is going to be contractual rather than technological. Technologists thinking rationally will tell you that anyone with physical possession of an operating device wins, every single time. If your lawyer cannot sufficiently derisk this for you then don't take on this business. (I would expect them to say, as part of that conversation, "Look, enterprises generally don't give a #$'(%# about the IP of their vendors. If it were available in an envelope labeled Please Take This Valuable IP they'd pass it by because they have a business to run and you're just a distraction to them." And they're right.)