Method and system of copy protection of information

Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium

Reexamination Certificate

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Details

C386S349000, C386S349000, C380S201000, C380S203000

Reexamination Certificate

active

07340152

ABSTRACT:
The invention relates to a method of copy-protection of information stored on an information carrying medium. The method allows a reading device (e.g. a DVD drive) and an application device (e.g. an MPEG decoder) to exchange copy-protection information regarding the information carrying medium (e.g. an optical record carrier like a CD or DVD) and the content on that medium. The method is cryptographically secure, taking into account the situation where reading device and application device are connected to an open bus in a personal computer. In view of the high-volume nature of the drive, the method can be implemented cheaply. The inventive method is robust against a so-called man-in-the-middle attack.The invention relates also to a method of exchanging copy-protection information, to a copy-protection system and to devices for carrying out these methods, in particular a reading device, an application device and a device for playback and/or recording of information.

REFERENCES:
patent: 5134496 (1992-07-01), Schwab et al.
patent: 5915027 (1999-06-01), Cox et al.
patent: 5991499 (1999-11-01), Yagasaki et al.
patent: 6374036 (2002-04-01), Ryan et al.
patent: 9713248 (1997-04-01), None
patent: 9911064 (1999-03-01), None

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