DLP has been implemented to protect customer data for a service provider in the medical sector. The customer data that is confidential is trusted to the supplier. It gives the supplier the contractual obligation to deal responsibly with these data. DLP is implemented to prevent this data from being exchanged outside the agreed manner. As a result, the data can be exchanged between supplier and customer, but only via the agreed route. Outside this, DLP blocks the exchange of this data so that the supplier significantly reduces his risk.