Embedding data in an information signal

Details Embedding data in an information signal Embedding data in an information signal

2011-06-28

2011-06-28

Bragdon, Reginald G (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711SE12094, C380S201000, C713S184000

Reexamination Certificate

active

07971020

ABSTRACT:
A method of controlling copying of an information signal, comprises the steps of:prior to recordal and/or transmission, applying to the information signal a substantially imperceptible modification representing copy control data including a password securely encoded according to a predetermined algorithm;upon reproduction for copying by a user, deriving (S1, S3) the copy control data from the modified information signal;comparing (S8, S9, S11, S13, S15) the derived securely encoded password with a reference password securely encoded according to a predetermined algorithm; andenabling (S5) copying of the information signal if the securely encoded password derived from the information signal and the securely encoded reference password have a predetermined relationship, otherwise disabling copying (S7).The reference password is sent to the user via a channel which is separate from a channel used to send the information signal to the user.

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patent: WO 00/51348 (2000-08-01), None

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