| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a security-protected, simple, and low cost copy protecting system having low throughput. <P>SOLUTION: A source generates a medium key(KM) and a media secret table having a plurality of entries, each including the (KM) encrypted by the public key (PU-PD) of a plurality of devices, and obtains the medium ID from a medium, and generates a content key (KD) for a piece of content, and encrypts the content into (KD (contents)) by using the (KD), and encrypts the (KD) into (KM (KD)) by using the (KM), and generates a package including the (KD (contents)), the (KM (KD)), the media ID and a signature verifiable by using the (KM) based on at least the medium ID, and copies the generated package and the media secret table to the medium. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
