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Optical disc authentication method and apparatus

  • US 20030072447A1
  • Filed: 08/31/2001
  • Published: 04/17/2003
  • Est. Priority Date: 08/31/2001
  • Status: Active Grant
First Claim
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1. An optical disc authentication method, each disc having a plurality of ways and a plurality of sectors in each way, the method comprising the steps of:

  • (i) measuring the quantity of sectors in each of a defined quantity of ways to provide a disc fingerprint comprising way sector quantity values for an original disc and a target disc; and

    (ii) authenticating the target disc by;

    a) comparing the target disc fingerprint to the original disc fingerprint to determine a percentage of coinciding way sector quantity values; and

    b) classifying the target disc according to whether its determined percentage value is above or below a pre-defined percentage threshold value, wherein a target disc having a determined percentage value of greater than or equal to the threshold value is classified as an original disc, and a target disc having a determined percentage value of less than the threshold value is classified as an illegally copied disc.

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