Title:
不正コンテンツ検知システム
Document Type and Number:
Japanese Patent JP4654219
Kind Code:
B2
Abstract:
Processing load on an executing device for conducting playback is high during the playback of contents since the executing device performs verification of the contents validity in parallel with the contents playback, and therefore the executing device has to be equipped with a highly efficient processor. The present invention reduces the processing load involved in the verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on the DVD. In addition, the present invention is capable of improving the accuracy of detecting unauthorized contents to some extent by randomly selecting a predetermined number of encrypted units every time the verification is performed.
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Inventors:
Nonaka Masao
Yuichi Fuda
Toshihisa Nakano
Kaoru Yokota
Motoji Omori
Miyazaki Masaya
Masaya Yamamoto
Murase Kaoru
Senichi Onoda
Yuichi Fuda
Toshihisa Nakano
Kaoru Yokota
Motoji Omori
Miyazaki Masaya
Masaya Yamamoto
Murase Kaoru
Senichi Onoda
Application Number:
JP2007123683A
Publication Date:
March 16, 2011
Filing Date:
May 08, 2007
Export Citation:
Assignee:
Panasonic Corporation
International Classes:
H04L9/32; G09C1/00; G11B20/10; G11B20/12
Domestic Patent References:
| JP2001519930A | ||||
| JP10293721A | ||||
| JP6068605A | ||||
| JP2001331102A | ||||
| JP2003510925A | ||||
| JP2002330127A | ||||
| JP2002215029A | ||||
| JP2001265217A | ||||
| JP2001155423A | ||||
| JP2001142398A | ||||
| JP2001051597A | ||||
| JP2000228060A | ||||
| JP11045508A | ||||
| JP1163871A | ||||
| JP63225840A |
Foreign References:
| WO2001082267A1 |
Attorney, Agent or Firm:
Shiro Nakajima
Shuji Matsumura
Kobayashi Kunito
Shuji Matsumura
Kobayashi Kunito