Patent ID: 7239240

Claim:
A radio frequency identification (RFID) system endowed with security measure on a monitored surface, comprising: at least one magnetic markers mounted on said monitored surface and setting up a local magnetic environment field pattern; a passive RFID device comprising: a microprocessor/memory unit providing logistics and data storage operation when performing identification and security measuring condition; an antenna unit is configured of communicating with a reader or a scanner; a power acquiring unit acquires power from said reader or scanner to support the operation of said RFID device and a magnetic sensor unit; said magnetic sensor unit connected to said RFID device and is characterizing said local magnetic environment field pattern; and wherein, an alarm signal or signals is generated and transmitted via said antenna unit to said reader or scanner to report a security violation condition, base upon changes in characteristic of said local magnetic environment pattern beyond a set of pre-specified threshold value or values, which said threshold value or values is stored in said microprocessor/memory unit.