| http://www.w3.org/ns/prov#value | - In procedure 3), however, the secondary encryption unit 24 of the user terminal 20 employs a different encryption method used in common with the server terminal 10 to encrypt the secret information, except for the signature information S, concerning an electronic watermark, and transmits to the verification office 30 the obtained secret information together with a secret key for the secondary encr
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