Abstract: Literary work data is stored in storing devices of C/Ss. Location information of literary work data is described on a list of a server. Corresponding to the list, a copyright licensing process promoting system supervises the C/Ss. It is determined whether or not a file tried to be transmitted from a C/S is literary work data. When the file tried to be transmitted is literary work data, it is determined whether or not the user has properly performed a predetermined copyright licensing process. When the determined result represents that the copyright licensing process has not been performed, a warning message that requests the user to perform the copyright licensing process is sent to him or her. When the user ignores the warning message and tires to transmit the literary work data, the copyright process promoting system attacks the C/S as the transmission source. For example, the file tried to be transmitted is destroyed.

Abstract: A copyrighted work managing method for managing copyrighted work data transmitted on a communication network is disclosed, that comprises the steps of (a) detecting copyrighted work data from communication data transmitted from a client on the communication network, (b) determining whether or not the user has performed a copyright licensing process for the copyrighted work data detected at the detecting step (a) against a copyright owner of the copyrighted work data, and (c) prohibiting the communication data from being transmitted corresponding to the determined result at the determining step (b).

Abstract: A synthesis signal which was reproduced from reproducing apparatus and converted into an analog signal includes an analog information signal and a copy control code. The copy control code is modulated by a spread spectrum. A code reading unit of the recording apparatus extracts the copy control code by an inverse spread spectrum. A code changing unit changes the copy control code by a spread spectrum as necessary. An output signal of the code changing unit is converted into a digital signal. The digital signal is subjected to processes necessary for recording and is recorded to a recording medium.