US 2004/0017918 A1Published application

Process for point-to-point secured transmission of data and electronic module for implementing the process

OwnerChristophe Nicolasinventor

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Abstract

A communication system for point-to-point communications of content such as video files in a video on demand system employs one or more keys specific to a user. Upon receiving a request including a specific user ID for a content, the transmission end uses the specific key corresponding to the user to encrypt control words that are transmitted to the user, to encrypt control words before they are used to encrypt the content at the transmission end, to encrypt the content itself, or some combination of the foregoing. A user unit performs the reverse operation using one or more specific keys stored in the user unit and/or a security module associated with the user unit. The user unit also uses a specific key to encrypt any content that is stored at the user unit.

Claims8

Dependent claims

Process for point-to-point secured transmission of data between a managing centre (10) and a unit among a plurality of user units linked to said managing centre, said data including a content (CT) encrypted by at least one control word (cw), each user unit including at least one decoder/receiver (12) provided with at least one encryption key (K1, K2, . . . Kn) specific to each user unit,

characterized in that it includes the following steps
transmitting a request from the user unit (D1, D2, . . . Dn) to the managing centre requesting the sending of a specific content (CT),
transmitting a unique identifier (UA1, UA2, . . . UAn) to the managing centre, this identifier allowing to unequivocally determine the user unit having transmitted the request,
determining, from a database (14) associated with the managing centre, the key (Kn) corresponding to said user unit having transmitted the request,
determining the control word or words associated with the content (CT) to be transmitted,
encrypting these control words (cw) with said key (Kn) corresponding to said user unit having transmitted the request, to obtain encrypted control words (cw′, cw*),
transmitting the encrypted control words (cw′, cw*) to the user unit having transmitted the request, and
transmitting said encrypted content to the user unit having transmitted the request.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/289,374Filed 7 Nov 2002
Priority: CH CH 1298/0224 Jul 2002
Published: 29 Jan 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H04N 7/17318
Transmission or handling of upstream communications: direct or substantially direct transmission and handling of requests
H04N 7/1675
Systems rendering the television signal unintelligible and subsequently intelligible: providing digital key or authorisation information for…
H04N 21/25808
Client or end-user data management, e.g. managing client capabilities, user preferences or demographics, processing of multiple end-users…:…
H04N 21/26606
Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD…: for…

Family

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