Title:
ブロードキャストコンテンツの利用法を監視する手順
Document Type and Number:
Japanese Patent JP2006528445
Kind Code:
A
Abstract:
Method for monitoring the usage of a service by a communication device coupled to a tamper resistant module, in particular a smart card. A said service is transmitted from a resource able to communicate with said communication device by way of a network. The service comprises a plurality of encrypted data flow and its use comprises successive decryption steps of data flow by a respective first key EK, said first key EK being encrypted in the data flow and decrypted in the tamper resistant module by way of a second key KEK stored in said tamper resistant module or derived inside said module. The invention is characterized in that said method comprises the following steps: a. A counting step, in which a memory location stores a count of occurrences of decryption steps of said first key EK attached to a same service; b. A using step, in which said counter is used to prove the amount of data flow which has been decrypted.
Inventors:
Abelyan Seville, Giorgiyu
Application Number:
JP2006520926A
Publication Date:
December 14, 2006
Filing Date:
July 12, 2004
Export Citation:
Assignee:
Axalt S Are
International Classes:
H04L9/08; H04N7/16
Domestic Patent References:
| JP2001517901A | 2001-10-09 | |||
| JPH09312642A | 1997-12-02 | |||
| JP2003153220A | 2003-05-23 | |||
| JP2002032668A | 2002-01-31 |
Foreign References:
| WO2002047356A2 | 2002-06-13 |
Attorney, Agent or Firm:
Yoshio Kawaguchi
Makoto Ono
Kenkyo Kanayama
Katsuma Osaki
Mitsuaki Tsubokura
Makoto Ono
Kenkyo Kanayama
Katsuma Osaki
Mitsuaki Tsubokura