Unauthorized contents detection system

G - Physics – 06 – F

Patent

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Details

G06F 1/00 (2006.01)

Patent

CA 2560395

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.

Sur un dispositif de lecture, la charge de traitement pendant la lecture est élevée du fait que ledit dispositif doit vérifier la nature des contenus parallèlement au travail de lecture et doit donc être équipé d'un processeur hautement efficace. La présente invention permet de réduire la charge de traitement imposée par la vérification en n'utilisant, pour ce dernier aspect, qu'un nombre prédéterminé d'unités cryptées choisies de manière aléatoire parmi les multiples unités cryptées qui forment les contenus cryptés enregistrés sur le disque numérique polyvalent (DVD). De plus, cette invention procure dans une certaine mesure une plus grande précision dans la détection de contenus non autorisés grâce à la sélection aléatoire d'un nombre prédéterminé d'unités cryptées chaque fois qu'est effectuée une vérification.

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