Abstract: A method of transmitting digitally coded traffic information is described, in which a digitally coded traffic message including location information is transmitted is standard format, preferably according to the TMC method. When the location information in the traffic message requires change and/or completion, a header is provided in front of the traffic message, which indicates that additional information including changes or additions to the location information in the traffic message follows the traffic message. A receiver for reception and analysis of the digitally coded traffic information is also provided, which analyses the traffic information including the additional information to obtain the changed or completed location information.

Abstract: System for protecting data on a data carrier on which is stored an accessible medium code and data only accessible after presenting an access code, comprises: a) an apparatus incorporating, a programmed processor, a user interface, a mobile telephone incorporating a SIM-card, b) a central station incorporating a further programmed processor cooperating with a number of memories storing valid medium SIM and access codes. The processor can be connected through the telephone and a suitable communication network to the further processor in the central station whereby the SIM-code of the telephone and the medium code of the carrier are transferred to the further processor to be processed into an access code. The resulting combination of codes is compared with codes stored in memories, and in case of a valid code combination a coded access permission is sent to the processor enabling the software to read data from the data carrier.

Abstract: System for protecting data on a data carrier on which is stored an accessible medium code and data only accessible after presenting an access code, comprises: a) an apparatus incorporating, a programmed processor, a user interface, a mobile telephone incorporating a SIM-card, b) a central station incorporating a further programmed processor cooperating with a number of memories storing valid medium SIM and access codes. The processor can be connected through the telephone and a suitable communication network to the further processor in the central station whereby the SIM-code of the telephone and the medium code of the carrier are transferred to the further processor to be processed into an access code. The resulting combination of codes is compared with codes stored in memories, and in case of a valid code combination a coded access permission is sent to the processor enabling the software to read data from the data carrier.