sorry man

I didn't understand this


"" No, 1 VIN license lets you license 1 ECM/PCM and 1 TCM. It is locked to the serial number of the controller, so if you swap that controller into another ride you dont have to use a new license. But if your ECM dies you will have to use another license in the same ride.
""

what do you mean by ECM/PCM and TCM?
What do you mean by ECM dies? how could it die?