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Then, returning to the power-on step 330 in the flow chart 300 of the server terminal, the baseboard management controller supplies the power to the corresponding server according to the power-on command.
When an illegal copy is found, the server terminal 10 submits the anonymous public key with the certificate to the verification office 40 and in turn obtains the name of the user to whom the public key corresponds, so that the user can be identified.
If at procedure 4) correct watermark information is not verified by the verification office 30 due to the performance of an illegal activity by the server or the user, notifications to that effect are forwarded to the server terminal 10 and to the user terminal 20.
According to the electronic watermark method of the fifth embodiment, since both the server terminal 10 and the user terminal 20 perform the digital data encryption process and the electronic watermark information embedding process, even if either the server or the user independently illegally copies digital data, such an activity can be easily detected and a culpable person can be easily identified.
This is because an illegal use of the communication system call 122 and the library function 121 by the client application 111 in the communication terminal apparatus 100 cannot be allowed, communication with the server terminal apparatus 51 cannot be realized if the library function 121 is not correctly used, and the pre-process 125 is necessarily executed prior to the communication if the library function 121 is correctly used.
In addition, the server terminal 10 submits to the verification office 30 an anonymous public key that is obtained in consonance with the illegal electronic cash Mw', the extracted user information and the contract information, and requests the name of the user who corresponds to the anonymous public key.
The server terminal 10 extracts user information U' from an illegal image Gw' that is discovered, and submits to the verification office 30 the extracted user information U' and an anonymous public key, which is obtained from the contract information, to acquire the name of a user who corresponds to the anonymous public key.
The server terminal 10 submits to the verification office 30 the illegal image Gw', the user extracted user information U' and the name of the user, and requests that a verification process be performed for the user.
The server terminal 10 extracts user information from illegal electronic cash Mw', and also extracts signature information S' by performing the primary encryption for the illegal electronic cash Mw'.
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