Method for activating functions in a radio receiver

A system comprising a radio receiver and server, wherein the radio receiver and the server are set up to perform a method, in which:

• a) the radio receiver detects a radio signal section by recording over a predetermined period one or more radio signals received by it from a radio system, wherein the radio signal section has an associated piece of location and/or time information that represents the location of the radio receiver on reception of the radio signal(s) and/or the time of reception of the radio signal(s) and that is ascertainable from the radio signal section;
• b) the radio receiver converts the radio signal section into a communication signal that contains the radio signal section, and transmits this communication signal via a communication network to a server;
• c) the transmitted communication signal is received via the communication network by the server, which uses the radio signal section in the communication signal to determine whether the piece of location and/or time information associated with the radio signal section is in an admissible value range;
• d) the server transmits an activation code via the communication network to the radio receiver if a number of criteria are satisfied, the number of criteria comprising the criterion that the associated piece of location and/or time information is in the admissible value range;
• e) the transmitted activation code is received via the communication network by the radio receiver, whereupon activation of one or more functions is initiated in the radio receiver.