Signals outputted from oscillators are in phase with signals as reflected by band elimination filters at elimination frequencies of the band elimination filters, while they are in opposite phase with signals leaked from the corresponding band elimination filters. The RFID article includes a plurality of inlays on a flexible substrate. For each incoming and outgoing e-mail message, the language of the user is compared to the language used by a designated correspondent from whom the e-mail message was sent or to whom the e-mail message shall be transmitted. During simulation, a behavior signature is generated based on the API calls issued by potential malware.