Security system

A security system for detecting unauthorized removal of goods from a restricted area having at least one goods entry and at least one goods exit, in which each of the goods carries a semiconductor chip to which data can be written and from which data can be read, the security system comprising:

• a) first read/write means at the at least one goods entry;
• b) second read/write means at the at least one goods exit;
• c) stock control computer means linked to said first read/write means, to read/write first specific data from/to a respective said semiconductor chip of each of the goods entering the restricted area;
• d) at least one point of authorization means having third read/write means, said third read/write means being linked to said stock control computer means, arranged to change second specific data on the respective semiconductor chip to indicate that the exit of the goods from the restricted area has been authorized;
• e) at least one fixed detector means at the at least one goods exit, arranged to read each tag of the goods to determine if said second specific data have been changed on said semiconductor chip;
• f) means for initiating an alarm if said fixed detector means determines no-change of said second specific data;
• and
• g) at least one refunds/returns detector means having fourth read/write means, said fourth read/write means for reading the respective semiconductor chip of each of the goods presented to said refunds/returns detector means and for determining if said second specific data have been changed on the semiconductor chip, and to change said second specific data.

A security system for detecting unauthorized removal of good from a restricted area having at least one goods entry and at least one goods exit, in which each of the goods carries a read/write tag, the security system comprising:

• a) first read/write means at the at least one goods entry;
• b) second read/write means at the at least one goods exit;
• c) stock control computer means linked to said first read/write means, for reading/writing first specific data from/to the respective tag of each of the goods entering the restricted area;
• d) at least one point of authorization means having third read/write means, said third read/write means linked to said stock control computer means and arranged to change second specific data on the respective tag to indicate that the exit of the goods from the restricted area has been authorized;
• e) at least one fixed detector means at said at least one goods exit for reading each tag of the goods and for determining if said second specific data have been changed on the tag;
• and
• f) means for initiating an alarm if said fixed detector means determines no change of said second specific data, said fixed detector means having at least one ferrite core aerial mounted to a drive apparatus which is arranged to displace the aerial in a scanning mode across said at least one goods exit.