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Method and device for managing a transmission of keys

A key and equipment technology, applied in the field of management key transmission, can solve the problems of adding overhead and trouble

Inactive Publication Date: 2009-09-16
INTERDIGITAL VC HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is cumbersome to send all the keys to the consumer and adds a lot of overhead to what is transmitted

Method used

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  • Method and device for managing a transmission of keys
  • Method and device for managing a transmission of keys
  • Method and device for managing a transmission of keys

Examples

Experimental program
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Embodiment Construction

[0029] The example embodiments fall within the framework of MPEG-4 FGS, but the invention is not limited to this particular environment and can be applied in other frameworks for transporting sets of encrypted coded frames.

[0030] There are various ways of separating the delivered digital services into different components; these components are delivered by means of client-specific streams. For example, an incremental encoder can be used, which encodes a service or a component of the latter (eg video) in the form of a small bandwidth "first" stream (aka elementary stream) as well as a supplementary stream. In the reduced-level transport mode, elementary streams are generally sufficient for restoration of service. Elementary streams can always be decoded independently. In the case of video, the base service may contain a low-resolution version of the video. The same is true for audio. Supplementary streams transmit information missing in the base stream, enabling restorati...

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Abstract

The present invention concerns a method and a device for encrypting an encoded scalable enhancement frame (3.2) sent by an emitter (5.1) to a receiver (5.2), the enhancement frame comprising a plurality of complementary streams ordered in term of quality level, each complementary stream corresponding to a combination of more than one scalability type, where a complementary stream of a lower quality level corresponds to a lower quality on each scalability type, comprising at the level of the emitter the steps of generating a key (S1) per complementary stream for encrypting said complementary stream in such a way that all scalability types can be either simultaneously or individually used, said keys being generated in such a way that only the keys of the complementary streams of quality levels lower than the quality level of a complementary stream can be obtained from the key of said complementary stream, and sending (S3) the key of a complementary stream corresponding to a required quality level to the receiver, the key permitting a receiver to generate the keys of the complementary streams of the lower quality levels only. The present invention also concerns a method and a device for decrypting a received encoded scalable enhancement frame.

Description

technical field [0001] The invention relates to a method for managing the transmission of keys. Background technique [0002] Fine Grain Scalability (Fine Grain Scalability) technology is defined in MPEG4-Part 2 and MPEG2-Part 10. This will be referred to as MPEG-4 FGS below. MPEG-4 FGS defines a method in which a data stream is compressed into two layers: a base layer (non-scalable part), and an enhancement layer (scalable part). A receiver of the compressed stream may decode the base layer only or both the base layer and the enhancement layer. If only the base layer is decoded, this will result in a lower quality version of the original content. If a part of the enhancement layer is decoded and combined with the base layer, this will generate content with improved quality proportional to the decoded enhancement part. In addition, the enhancement layer supports Peak Signal-to-Noise Ratio (PSNR hereinafter) scalability, as well as temporal scalability. MPEG-4FGS thus pr...

Claims

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Application Information

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IPC IPC(8): H04N7/16
CPCH04N7/165H04N21/234327H04N21/4405H04N21/63345H04N21/2662H04N21/2347H04L9/08
Inventor 穆罕默德·卡若米斯蒂芬·昂奴阿兰·迪朗
Owner INTERDIGITAL VC HLDG INC
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