Patent ID: RE38702

Claim:
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 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) b) 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) c) at least one point of authorization means having third second read/write means, said third second read/write means being 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; f) d) at least one fixed detector means at the at least one goods exit for reading each a tag of the goods to determine if said second specific data have been changed on the tag; g) e) means for initiating an alarm if said fixed detector means determines no change of said second specific data; and h) f) at least one refunds/returns detector means having fourth third read/write means, said fourth third read/write means for reading the respective tag of each of the goods presented to said refunds/returns detector means and to determine if said second specific data have been changed on the tag, and to change said second specific data.