Patent ID: 7834741

Claim:
A circuit for a data carrier, wherein the data carrier comprises an interface for contactless communication with a communications arrangement, wherein the circuit comprises: memory means for storing identification information consisting of information units, wherein the interface is configured to supply the identification information to the communications arrangement, and signal processing means that are arranged to receive and process an indicator signal, wherein the indicator signal indicates a substantially simultaneous appearance of two different information units, wherein one information unit is contained in the identification information stored in a memory stage of the circuit for the data carrier, and the other information unit is contained in different identification information stored in a memory stage of a different circuit, and wherein the indicator signal is generated by the communications arrangement upon detection of such a substantially simultaneous appearance of different information units and is communicated to the circuit for the data carrier, and wherein the signal processing means as a consequence of receiving and processing the indicator signal are arranged, firstly, to interrupt the supply of the identification information that has caused the indicator signal and are arranged, secondly, to memorize at least the information unit that has caused the indicator signal.