Digital compact disc player security system reproducing method a

Details Digital compact disc player security system reproducing method a Digital compact disc player security system reproducing method a

1995-11-13

2000-09-19

Beausoliel, Jr., Robert W.

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Protection at a particular protocol layer

380201, G06F 1214

Patent

active

061227390

ABSTRACT:
A security system for preventing disc players from being used with unauthorized software is disclosed. The security code is stored through modulating an offset of the physical position of a plurality of data bits from a nominal track position. A two part optical read head provides an RF signal corresponding to the presence of a physical offset modulation. The RF signal is present when there is a physical offset of the data bits defining a first logical state and the absence of the RF signal defines a second logical state. A digital security code is encoded and decoded in this manner. A system for encoding a security code through modulating the physical offset of a plurality of data bits from a nominal track position is also disclosed.

REFERENCES:
patent: 4336981 (1982-06-01), Mori
patent: 4454594 (1984-06-01), Heffron et al.
patent: 4462076 (1984-07-01), Smith, III
patent: 4942565 (1990-07-01), Lagadec
patent: 5155768 (1992-10-01), Matsuhara

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