Modulation method for minimizing pirating and/or unauthorized copying and/or unauthorized access of/to data on/from data media including compact discs and digital versatile discs
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United States of America Patent
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Jan 5, 2010
Grant Date -
N/A
app pub date -
May 20, 1999
filing date -
May 20, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a technique for authenticating data stored on media in order to prevent piracy. According to the present invention, a lookup table contains broken or modified modulation rules comprising one or more authentication keys or components thereof, that are derived by the table's intentional breaking of standard 8-14 and 8-16 modulation rules. The authentication keys are formed and remain hidden without being transferred in the audio/video. Additionally, the lookup table is employed using conventional hardware and/or software in CD or DVD players. Each output value according to the present invention is a function of the physical characteristics of a disc that does not travel with the audio or video or graphics data. Authentication systems of the present invention optionally encompass singular, multiple or multi-level authentication systems, each of which successively must be deciphered before the audio/video is finally available.
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