Abstract: A method for authorizing a first participant in a communication network, via which a plurality of participants communicate. A respective identification information is associated with each of the participants, the method includes: transmitting the identification information of the first participant to a second participant in the communication network, which is a processing device; checking, by the processing device, whether authorization data associated with the identification information is present in a data structure; and enabling a function of the second participant exclusively upon fulfillment of an authorization condition evaluating the authorization data, which condition can only be fulfilled if authorization data associated with the identification information are present.