Security tag using security system and office instrument

摘要

In a security system comprising a security administrative server (2) connected to a network, a plurality of office instruments (FMI to FMn) operative to perform at least one of printing, scanning and copying and a user terminal (4), each of the office instruments (FM1 to FMn) attaches a tag (Tg) to sheet and image data documents when a document is to be processed, and transmits the document image data to a security administrative server (2) together with the security tag Tg to be stored there. The security administrative server (2) compares incoming image data and security tag Tg with those already stored in a security file, and transmits a result of the comparison to the applicable office instruments (FM1 to FMn). The applicable office instruments (FM1 to FMn) then either allow or reject document image data processing in accordance with the result of the comparison. <IMAGE>