Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2004-03-16
2009-11-17
Henning, Matthew T (Department: 2431)
Cryptography
Video cryptography
Video electric signal modification
C380S210000, C725S088000
Reexamination Certificate
active
07620180
ABSTRACT:
A method of processing content in a video on demand (VOD) system consistent with certain embodiments of the invention, wherein the content is identified by a first set of packet identifiers (PIDs), involves receiving content, the content having marked packets designating packets that are to be encrypted by a first encryption system by setting an encryption flag for all packets designated to be encrypted. Packets are selected in the content according to a selective encryption selection criterion to produce selected packets. The selected packets are duplicated to produce duplicate copies of the selected packets and these duplicate copies are identified using a second set of PIDs. The duplicate copies identified by the second set of PIDs are inserted into the content. All encryption flags in the content are cleared except for the selected packets having the first set of PIDs, so the encryption to follow is selective. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.
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Agnihotri Davender
Pedlow, Jr. Leo M.
Henning Matthew T
Miller Jerry A.
Miller Patent Services
Sony Corporation
Sony Electronics Inc.
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