A method of determining or monitoring a process variable in automation technology

The invention relates to a method of determining or monitoring a process variable in automation technology, with at least one field device. The method comprises the steps of: - the customer (K) includes a license agreement (LV) from about accessing the data (DAT) of the field device (1) or the number of accesses to the data (DAT) of the field device (1) that the customer (K ) are provided per unit time, or the customer (K) triggers an order of data (DAT) of the field device (1); - the data (DAT) of the field device (1) are stored encrypted in a first service platform (SP1), the (SP2) is associated with a second service platform; - the customer (K) communicating with the second service platform (SP2), which is capable of a license agreement (LV) provide or reproduce and / or to verify and / or to support the processing of the license agreement (LV); - determined in accordance with the license agreement (LV) arrangements, or corresponding to the order will be the client (K) at predetermined cycles, or once the data (DAT) via a first transaction provided; - set according to the in the license agreement (LV) Payment is payment for the provided data (DAT).