Hello,
As I 've said before at my introduction post, I work at a company that builds CNC machines for marble.
We search of a way to lock the software (or generally the machine) from working, something like a "30days trial lock" for customers that haven't fullfilled their liabilities of the purchase

of the machine for example.
At our larger machines that we use Heidenhain controllers, we have this kind of option.
Feel free to suggest anything...
Yannis