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Encrypted transport stream production method, trick mode play method and system

A technology of encrypted transmission and trick mode, applied in the field of trick mode playback, can solve the problem of objection to giving up access control and so on

Inactive Publication Date: 2009-06-24
ENTROPIC COMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This creates two problems, the first being that service providers would object to giving up access control, and the second being that programs encrypted with "local" keys are more vulnerable to unauthorized access

Method used

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  • Encrypted transport stream production method, trick mode play method and system
  • Encrypted transport stream production method, trick mode play method and system
  • Encrypted transport stream production method, trick mode play method and system

Examples

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Embodiment Construction

[0020] For the purposes of this disclosure, encrypt, scramble, and encrypt, as well as their derivatives, all mean the same action and effect. When the terms "display", "real-time playback" and "delayed playback" are used, these terms are meant to include not only the display of video streams, but also the playback of audio and data streams. A trick mode is defined as any time warping effect superimposed on an audio, video or data signal, such as time-lapse play, fast forward and rewind, slow motion, stop motion, freeze frame, gating effects, bookmarking and seeking. Metadata is data about data. In this disclosure, metadata includes information such as copy protection scheme information, copyright information, program guides, program titles, program topics, closed captions, program ratings, and other program-specific information as well as information about file sizes, encodings, and type of information. Although primarily processing data contained in a Moving Picture Expert...

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PUM

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Abstract

A method for trick mode playback of an encrypted transport stream containing audio / video / data information comprising: extracting and decrypting data used as local metadata for a program in the encrypted transport stream; generating a trick mode pointer from the metadata; and The trick mode pointer and the encrypted transport stream are stored on the storage medium.

Description

technical field [0001] The present invention relates to the field of trick mode playback of audio / video / data streams; in more detail, it relates to a method and device for providing encrypted access to trick mode playback of audio / video / data streams. Background technique [0002] In digital satellite and cable technologies, the raw material (ie, the program) in the form of a digital transport stream is often encrypted by the service provider using conditional access (CA). CA keys are usually provided to end users in the form of chips and magnetic cards and other means in the user's system that allow audio, video and data decryption keys to be read within the transport stream. The CA key allows access to additional encryption keys within the transport stream. In order to provide trick modes, the source material must be decrypted and demultiplexed in order to generate pointer files so that the system unit can locate specific parts of the source material and store the source m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/913H04N5/783G11B20/00H04N5/76G11B20/10H04J3/00H04N5/91H04N7/167H04N7/26H04N9/804H04N21/418H04N21/426H04N21/835
CPCH04N21/4325H04N2005/91364H04N5/913H04N21/8455H04N21/84H04N21/440281H04N9/8042H04N5/783H04N21/4348
Inventor A·P·卡瓦尔勒拉诺R·C·-T·申
Owner ENTROPIC COMM INC