Method and apparatus for determining the provenance of a...

G - Physics – 11 – B

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G11B 20/18 (2006.01) G11B 7/0037 (2006.01) G11B 23/28 (2006.01) G11B 23/30 (2006.01)

Patent

CA 2345725

The manufacturing process for a data carrying disc, such as a CD, begins with the production of a master, and in the physical manufacturing process of the master, variations are introduced which give the master distinctive physical characteristics and cause errors in the data. The master is used to form generations of discs, and the physical characteristics of the master are passed on down the generations. A group of discs manufactured from the same source consistently exhibit the physical characteristics of the master, and those physical characteristics are used as a "fingerprint" for identifying that source. To determine the provenance of a data carrying disc, uncorrected data is read from the disc. Information about errors is extracted from the data read. The error information is then compared with characteristic error information which characterises data carrying discs produced from a well known source to determine whether the data carrying disc has been produced from the known source. The error information extracted is representative of errors arising from the physical manufacturing process.

Le processus de fabrication d'un disque enregistré, tel qu'un disque compact, nécessite la réalisation d'une matrice. Or, pendant les opérations physiques de réalisation de cette matrice, des variations viennent l'affecter de caractéristiques physiques distinctives et viennent entacher d'erreurs les données. Les caractéristiques physiques de la matrice se transmettent de générations en générations, car c'est toujours la même matrice que l'on utilise pour la production de générations successives de disques. Ainsi, tous les disques fabriqués par une même source reproduisent de manière constante les caractéristiques physiques de la matrice qui constituent en quelque sorte une "empreinte digitale" permettant d'identifier la source considérée. Pour déterminer la provenance d'un disque enregistré, on lit sur le disque les données non corrigées, et on en extrait des informations d'erreurs qui, par comparaison aux informations d'erreurs caractéristiques des disques enregistrés d'une source considérée, permettent de déterminer si un tel disque enregistré a été produit par la source considérée. L'information d'erreurs extraite est caractéristique des erreurs se produisant pendant le processus de fabrication physique.

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