Method of accessing data on a copy protected data carrying disc

Details Method of accessing data on a copy protected data carrying disc Method of accessing data on a copy protected data carrying disc

2007-06-13

2008-08-19

Edun, Muhammad N. (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

For copying

C369S053210, C369S053410, C369S084000, C369S275100

Reexamination Certificate

active

07414930

ABSTRACT:
The method and apparatus described utilise the fact that CDs manufactured from the same master will have distinctive physical characteristics attributable to the physical manufacturing process of the master to distinguish counterfeit CDs from genuine discs. For a genuine disc, the relative angular orientation of specified sections of the recorded data are determined and recorded. The relative angular orientation of the same sections of data on a test disc are also determined. Where the relative angular orientations are the same it is concluded that the test disc derives from the same source as the genuine disc and is therefore bona fide. Where there is no correlation, the test disc may be identified as counterfeit. The relative angular orientations, or other physical characteristics of the discs, may be physically measured, or may be calculated from information gained by reading the data on the disc. The disclosed technique can also be used to copy protect discs.

REFERENCES:
patent: 6646967 (2003-11-01), Garcia
patent: 6987715 (2006-01-01), Kobayashi et al.
patent: 2002/0067674 (2002-06-01), Schneck et al.
patent: 2003/0198162 (2003-10-01), Heylen

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