The copy protection of optical discs

G - Physics – 11 – B

Patent

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Details

G11B 20/00 (2006.01) G11B 20/14 (2006.01) H03M 5/14 (2006.01)

Patent

CA 2513634

The present invention relates to a method of copy protecting optical discs, such as CD-ROMs. Instead of encoding data onto the CD-ROMs in a manner which ensures balanced dc content, for copy protection the digital data is encoded and recorded onto the optical disc such that it is arranged to give some of the recorded digital data unbalanced dc content. Thus, for example, the DSV value of the encoded data may be changed rapidly in less than (100) frames to (Figure 9). For an area of digital data on the optical disc in which the DSV has been caused to rise steeply (Figure 10a), heavy distortions in audio arise (Figure 10c) during an attempt to copy an audio track including the single segment of unbalanced dc content.

La présente invention concerne un procédé de protection contre la copie de disques optiques, tels que des CD-ROM. Au lieu de coder des données sur les CD-ROM de manière à garantir un contenu CC non équilibré, pour la protection contre la copie, des données numériques sont codées et enregistrées sur le disque optique de manière à pouvoir donner un contenu CC non équilibré à certaines des données numériques enregistrées. Ainsi, par exemple, la valeur DSV des données codées peut être changée rapidement en moins de (100) trames en (figure 9). Dans une zone de données numériques du disque optique, le DSV engendre des distorsions fortes (figure 10a) et lourdes dans l'apparition audio (figure 10c) lors d'une tentative de copie d'une piste audio contenant le segment unique de contenu CC non équilibré.

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