| 摘要 |
A transponder having a transmitting and receiving device for receiving commands and transmitting data and command processor for executing commands, and a programming device for changing the memory contents, and a data memory which has a first memory area and a second memory area, whereby the first memory area has the first value or a second value, and when the first memory area has the first value, the content of both memory areas can be changed and, in the case of read access to the second memory area, the transmitting/receiving device transmits a predefined or no data stream instead of the memory content of the second memory area.
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