Embedding data in an information signal

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

2006-08-08

2006-08-08

Peikari, B. James (Department: 2189)

Electrical computers and digital processing systems: support

System access control based on user identification by...

Pin/password generator device

C713S152000, C713S182000, C711S164000

Reexamination Certificate

active

07089422

ABSTRACT:
The present invention controls copying of an information signal, comprises the steps of prior to recording 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; and enabling (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.

REFERENCES:
patent: 4918653 (1990-04-01), Johri et al.
patent: 5161210 (1992-11-01), Druyvesteyn et al.
patent: 5761301 (1998-06-01), Oshima et al.
patent: 6879965 (2005-04-01), Fung et al.
patent: WO 00/51348 (2000-08-01), None

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