Method and system for key insertion for stored encrypted...

Details Method and system for key insertion for stored encrypted... Method and system for key insertion for stored encrypted...

2006-03-28

2006-03-28

Smithers, Matthew (Department: 2137)

Cryptography

Key management

C380S201000, C380S286000, C380S044000, C380S047000, C380S279000, C380S278000

Reexamination Certificate

active

07020287

ABSTRACT:
An encrypted content transport stream is received by a viewer's device and recorded for subsequent playback. During recording, keys in headers of packets of the stream are stripped and placed in sequence in a table. Also, the table indicates changes in key indicating bits. When it is desired to play the content, start-of-frame indicator bits such as PUSI and/or RAI bits are used to access the table of keys to retrieve the keys necessary to decrypt the transport stream packets sought to be played.

REFERENCES:
patent: 5825876 (1998-10-01), Peterson, Jr.
patent: 6157719 (2000-12-01), Wasilewski et al.
patent: 6381331 (2002-04-01), Kato
patent: 6480664 (2002-11-01), Ting et al.
patent: 6633564 (2003-10-01), Steer et al.

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