Patent ID: 8812842

Claim:
A motor vehicle display apparatus having an electronic appliance configured for mounting in a motor vehicle, the electronic appliance comprising: a first memory area for storing data, wherein the comprises motor vehicle information; a second memory area for storing at least one first certificate; a first interface for receiving a first signal and a signature for the first signal from a transmitter external to the motor vehicle; a validity checking module, the validity checking module capable of checking the validity of the signature of the first signal using the first certificate; a signal generation module, the signal generation module capable of accessing data from the first memory area in response to the first signal and generating a second signal carrying a representation of the accessed data; a display actuating module responsive to the second signal, the display actuating module capable of actuating a display to visually output the representation of the accessed data; a fourth memory area for storing a motor vehicle identifier; and a tag verification module; wherein the second signal is generated and/or output only if the signature is valid; wherein the motor vehicle identifier explicitly identifies a motor vehicle with which the motor vehicle display apparatus is associated; wherein the fourth memory area is a protected memory area; wherein the first interface is designed to receive a message; wherein the message contains at least the first signal, a tag and the signature of the first signal and/or of the tag; wherein the tag verification module is capable of checking whether the tag matches the motor vehicle identifier stored in the fourth memory area and wherein a prerequisite for the generation and/or output of the second signal is that the tag and the motor vehicle identifier match.