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Method and apparatus for encrypting/decrypting multimedia content to allow random access

A technology for multimedia files and media, applied in the field of encryption and decryption of multimedia files

Active Publication Date: 2019-07-19
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A challenge that has arisen is the need to provide protection for content that will be distributed

Method used

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  • Method and apparatus for encrypting/decrypting multimedia content to allow random access
  • Method and apparatus for encrypting/decrypting multimedia content to allow random access
  • Method and apparatus for encrypting/decrypting multimedia content to allow random access

Examples

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Embodiment Construction

[0020] Embodiments described herein provide a method for encrypting only the "content" portion of any codec transport stream data and leaving the meta-content (used for locating and playing back the content) intact. For example, in one embodiment, only the video content portion is encrypted. Therefore, the impact of any errors or byte expansion / contraction of data should be minimized and thus affect a small portion of the playback of the multimedia.

[0021] The following description assumes that a codec for storing multimedia content follows the MPEG4 standard promulgated by the Moving Picture Experts Group (MPEG), a working group of the International Organization for Standardization / International Electrotechnical Society Joint Technical Committee 1 (ISO / IECJTC1). The ISO / EEC standard is denoted as MPEG-x (for example, MPEG-1, MPEG-2, and MPEG-4), and the MPEG-4 standard is described in ISO / IEC14496-2.

[0022] MPEG4 files are composed of hierarchical atoms, containing metad...

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Abstract

The invention relates to a method and apparatus for encrypting / decrypting multimedia content to allow random access. A method is disclosed for encrypting a multimedia file including parsing the multimedia file to identify a media data portion; encrypting the media data portion; and, combining the encrypted media data portion with a non-encrypted non-media data portion. A method is also disclosed for playing a multimedia file including parsing the multimedia file to identify an unencrypted metadata portion; using the unencrypted metadata portion to locate a position of interest in the media file, the position of interest having an associated encrypted media data portion; and, decrypting the associated encrypted media data portion. An apparatus for performing the methods is also disclosed herein.

Description

[0001] Information about divisional applications [0002] This case is a divisional application. The parent case of this divisional case is an invention patent application with the filing date of July 12, 2006, the application number of 200680032332.1, and the invention title of "Method and Device for Encrypting / Decrypting Multimedia Content to Allow Random Access" . technical field [0003] Embodiments of the invention relate generally to encryption and decryption of multimedia files, and more particularly to methods and apparatus for encrypting / decrypting multimedia content to allow random access. Background technique [0004] With the adoption of 3G and other cellular networks, new IP packet data-based services are emerging. One of the most challenging service areas that operators are trying to develop involves distributing video content to a large number of markets. High-quality video is the most data-intensive type of content. At the same time, the consumer's exper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/167H04N21/2389H04N21/254H04N21/414H04N21/4385H04N21/835H04N21/84H04N21/845H04N21/854G06F21/10G06F21/60
CPCH04N7/1675H04N21/23897H04N21/2541H04N21/41407H04N21/43856H04N21/835H04N21/84H04N21/8455H04N21/85406H04N21/2347H04N21/4405G06F21/60G06F21/602H04N21/235H04N21/435
Inventor 克里斯托弗·温格特普贾·阿加瓦尔
Owner QUALCOMM INC