The mechanic only offers the service. He works on our equipment and then he is done with it. At no point the mechanic keeps a part of car with himself and use it for his own adavantage. Nor he can suspend your access to your car. In fact if he does pull something like that the system will run a full enquiry into it and punish.

As a user of service I want guarantee that my data will be processed as per my requirement and then it will be left alone.