CONTENTS TRANSMITTING DEVICE, CONTENTS RECEIVING DEVICE, CONTENTS TRANSMITTING PROGRAM AND CONTENTS RECEIVING PROGRAM

Japanese Patent JP3841337

B2

PROBLEM TO BE SOLVED: To provide a method, a device and a program for transmitting/ receiving contents, in which efficiency is improved when descrambling scrambled contents, a cryptographic key is easily managed when descrambling the contents, and the copyright of the contents can be protected.
SOLUTION: A system is composed of a contents transmitting device 3 for enciphering and transmitting contents and a contents receiving device 5 for receiving the contents, the contents transmitting device 3 is provided with a contents scramble part 7 for enciphering the contents by using a scramble key Ks, a contents key Kc, a work key Kw and a master key Km and a multiplexing part 9 for multiplexing the contents and sending them as multiplex enciphered contents and the contents receiving device 5 is provided with a demultiplexing part 13 for receiving and demultiplexing the multipled enciphered contents and a contents descrambler part 15 for obtaining the contents by deciphering enciphered information demultiplexed by the demultiplexing part 13.

Nishimoto Tomonari
Tatsuya Kurioka
Uehara Toshihiro
Seiichi Namba

JP2001307559A

November 01, 2006

October 03, 2001

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Japan Broadcasting Corporation

G06F12/14; H04L9/08; G06F13/00; G06F21/10; G06F21/60; G06F21/62; H04L9/00; H04L9/16; H04L9/20; H04N5/44; H04N5/76; H04N7/167; (IPC1-7): H04L9/08; G06F12/14; H04L9/20; H04N5/44; H04N5/76

JP2000115091A
JP2001119357A
JP7255049A
JP1248891A
JP2000023137A
JP2001359070A
JP2001285820A
JP2001333364A
JP2003264542A
JP10336623A
JP10290222A

Isono Dozo

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