To generate digital watermark embedded contents even by a terminal having low computational capability in a superdistribution system which freely distributes encrypted contents.
A server device 10 embeds an digital watermark representing user identification information UIDj in contents in advance, and encrypts and transmits an digital watermark generation information Ci" corresponding to differences between the obtained digital watermark embedded contents and the contents, and a client terminal 20 puts the contents Ci and digital watermark generation information together based upon the deciphered digital watermark generation information Ci" instead of embedding processing to generate and reproduce digital watermark embedded contents Ci'. Consequently, even the terminal having computational capability lower than the computational capability needed for embedding processing of the digital watermark can generate the digital watermark embedded contents.
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MATSUKAWA SHINICHI
KATO HIROSHI
TOSHIBA SOLUTIONS CORP
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto