Copy protectable optical media device and methodology therefor

G - Physics – 11 – B

Patent

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Details

G11B 7/004 (2006.01) G11B 7/00 (2006.01) G11B 7/0037 (2006.01) G11B 7/007 (2006.01) G11B 7/013 (2006.01) G11B 7/24 (2006.01) G11B 7/257 (2006.01) G11B 17/22 (2006.01) G11B 20/00 (2006.01) G11B 23/28 (2006.01)

Patent

CA 2283927

A method and system is disclosed for purposefully modifying the accessibility of information encoded upon an optical medium (1150) for indicating a state or history of an item associated therewith. In one embodiment, the modifying of the optical medium (1150) includes a device (1170) for purposefully damaging the optical medium (1150) when the information is initially accessed so that upon subsequent attempts at accessing the information on the optical medium (1150), the previous access to the information can be detected by the access errors purposefully generated. Thus, the present invention provides an effective technique for limiting illegal duplication and/or use of, e.g., software, movies, and music on compact disks and digital versatile disks. Moreover, the present invention is also useful for verifying the authenticity of persons and/or financial transaction cards during financial transactions.

L'invention concerne un procédé et un système qui permettent de modifier intentionnellement l'accessibilité d'une information codée sur un support optique (1150), de façon à indiquer l'état ou l'historique d'un élément qui lui est associé. Dans l'un des modes de réalisation, la modification du support optique (1150) fait appel à un dispositif (1170) qui permet d'endommager intentionnellement ledit support (1150) lorsqu'on accède pour la première fois à l'information, de façon que lors des tentatives ultérieures pour accéder à ladite information, on puisse détecter l'accès antérieur grâce aux erreurs d'accès générées intentionnellement. La présente invention représente donc une technique efficace pour limiter la duplication et/ou l'utilisation illégale de logiciels, de films et de musique notamment, enregistrés sur des disques compacts et des disques polyvalents numériques. Elle est également utile pour vérifier l'identité des personnes et/ou l'authenticité des cartes de transaction financière durant des transactions financières.

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