The Seal and the Lease
The Rules Ship Sealed.
The Authority Is a Lease.
A converted machine does what its rule set allows and nothing else. The rule set is signed and sealed, the authorization is a lease, and the physical stop sits outside both.
Where a Canadian Shield design carries a rule set, the rules ship sealed: signed rules and firmware, a hardware root of trust, no debug access, and tamper detection that ends in a safe stop with the log retained. Signing keys are held in Canada. The seal is chosen into the parts rather than bolted on afterwards, and signing authority is separated across development, test and production.
Authorization is a lease. It is time-limited and signed, issued against a machine and a task, and withdrawable. Withdrawal or expiry ends in a safe stop at the next safe point and a minimum-risk condition. It is never an instant stop sent over the air, and the safety loop stays wired.
A minimum-risk condition is task-specific rather than universal. In a burning structure, stopping and waiting for a person can itself be the harm, so each task carries its own, decided in advance rather than in the moment. The physical stop and the manual release on every actuator always remain, on every profile.
Hardware is bought and owned by the customer. The configuration and the application are licensed, sealed and revocable. What that costs a buyer is stated once: a Canadian Shield design will refuse a job that sits outside its sealed set, and the way to widen it is a new signed release rather than a switch on the ground. Manufacturing carries the floor those parts are built on and Sovereignty carries who holds the keys.