Abstract: A network system with integrated security protection facilities. The system involves a transmission unit and a reception unit, which are coupled to each other via a network. In the transmission unit, a data management unit performs centralized management of source data that is stored in a plurality of storage units in a distributed manner. In response to a data transmission request from a terminal local to the transmission unit, a data collection unit collects requested data items from the data management unit. A security processor applies appropriate security protection processes to the collected data, depending on its data confidentiality level. An identification data attaching unit attaches identification data to the transmission data. This identification data informs the recipient of what sequence of security process primitives has been applied to the source data. A transmitter sends out the security-protected data over the network.

Abstract: For warranting a validity of data recorded on a medium such as a rewritable magneto-optic disk etc, when registering a plurality of documents (n, n+1 . . . ) on the same recording medium, an n-th authenticator obtained by executing an encrypting process of data of the n-th document is recorded together with the n-th document data, and, when registering data of the (n+1)th document, an (n+1)-th authenticator is generated by executing the encrypting process of the n-th authenticator and the (n+1)-th document data as the (n+1)th authenticator.

Abstract: A production data preparing system, for providing a metal mask plate used for soldering various SMDs on a printed-board, includes: a CAD file for storing production data for preparing the printed-circuit board; a foot-print shape storage unit for storing target foot-print shape data extracted from the CAD file in order to change the foot-print shapes; a mounting parts data storage unit for storing data of target SMDs extracted from the CAD file; a management table file for storing packaging parts attributes and foot-print shape changing rules and the relationships therebetween; and a preparation unit for preparing production data used for providing the metal mask plate.