System and method for partially encrypted multimedia stream

Details System and method for partially encrypted multimedia stream System and method for partially encrypted multimedia stream

H - Electricity

04

N

H04N 21/2347 (2011.01) H04N 21/2389 (2011.01)

Patent

CA 2517433

A multimedia stream head end includes a legacy conditional access (CA) device (20) that fully encrypts the stream using legacy keys. A copy of the stream is sent to a secondary CA device (24) that encrypts only critical packets in the stream using secondary keys to render a partially encrypted stream. The critical packets in the fully encrypted stream from the legacy CA device (20) are obtained and inserted next to the corresponding critical packets in the partially encrypted stream. Thus, only critical packets are encrypted, with encrypted versions being generated by both the legacy CA (20) and secondary CA (24) without the legacy CA (20) knowing which of the packets that it encrypts are "critical".

L'invention porte sur une tête de réseau de flux multimédia comprenant un dispositif d'accès conditionnel existant (20) qui chiffre totalement le flux au moyen de clés existantes. Une copie du flux est envoyée à un dispositif d'accès conditionnel secondaire (24) qui chiffre uniquement des paquets critiques du flux au moyen de clés secondaires afin d'obtenir un flux partiellement chiffré. Les paquets critiques du flux totalement chiffré provenant du dispositif d'accès conditionnel existant (20) sont obtenus et insérés à côté des paquets critiques correspondants du flux partiellement chiffré. Ainsi, seuls, les paquets critiques sont chiffrés, des versions chiffrées étant générées à la fois par le dispositif d'accès conditionnel existant (20) et par le dispositif d'accès conditionnel secondaire (24) sans que le dispositif existant (20) sache que les paquets qu'il chiffre sont <= critiques >=.

Affiliated with

Also associated with

Rating

System and method for partially encrypted multimedia stream does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System and method for partially encrypted multimedia stream, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for partially encrypted multimedia stream will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1510626