| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide publishing of contents in a digital copyright management (DRM) method. <P>SOLUTION: A packager packages digital contents for a user, while a licenser issues a digital license for the contents to the user so that the user renders the contents according to the license alone. The licenser and the packager share a secret so that they can calculate a contents key KD for the contents. The packager calculates the contents key KD on the basis of the shared secret and the contents ID and encrypts the contents according to the contents key for packaging the contents for the user. For issuing the license for the contents to the user, the licenser calculates the contents key KD on the basis of the shared secret and the contents ID, encrypts the contents key KD according to a public key of the user for forming the license, and transmits the license to the user. <P>COPYRIGHT: (C)2004,JPO |
