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Digital television program recording and playback method and system

A technology of digital TV and programs, applied in parts of TV system, parts of color TV, TV, etc., to achieve the effect of reducing possibility

Inactive Publication Date: 2010-09-29
SHANGHAI DIGIVISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is no correlation between the recorded stream and other devices, and the encrypted simple data is easy to be copied and used

Method used

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  • Digital television program recording and playback method and system
  • Digital television program recording and playback method and system
  • Digital television program recording and playback method and system

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Embodiment Construction

[0063] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0064] Figure 3A A preferred embodiment of the digital TV program recording method of the present invention is shown. See Figure 3A , the following is a detailed description of each step in the method.

[0065] Step S11: demultiplex the TS stream into audio stream and video stream in the form of TS packets and temporarily store them in the recording buffer. Here, the audio stream and video stream in the form of TS packets mainly have two forms: one has not been scrambled at the head end, and is for free programs; the other has been scrambled at the head end, and is for paid programs.

[0066] Step S12: Determine whether the TS stream has been scrambled at the head end. If it has been scrambled, go to step S13; otherwise, go to step S15.

[0067] Step S13: Extract the control word through the CA system.

[0068] Step S14: Use the control word tog...

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PUM

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Abstract

The invention discloses a recording and playback method for digital television programs and a system thereof, which can effectively prevent uncontrolled copy propagation of encrypted digital television programs. The technical proposal of the invention is that: the invention encrypts control words arranged with turbulence flow; the control words need to be decoded during the playback process and can not be played when copied, thereby TS stream files are effectively and safely protected. The invention also utilizes the prior resources intelligent card (ICC) sequence number and a set-top box (STB) sequence number for encryption and then being stored into a hard disc, and the sequence numbers are taken as external dependency relationships for playing streams, thereby the TS streams are guaranteed to only be able to play when the streams are matched and probability of stream propagation is effectively reduced. The invention is applied in the digital television program recording and playback field.

Description

technical field [0001] The invention relates to a method and system for recording and replaying digital TV programs, in particular to a method and system for preventing digital TV programs from being copied without permission. Background technique [0002] With the rapid development of the field of digital television, related technologies emerge in endlessly. figure 1 shows the structure of the existing digital TV broadcasting system, such as figure 1 As shown, the system includes two parts: the head end (also called the front end) and the terminal (also called the receiving end). The head subsystem mainly includes sequentially connected MPEG encoder 10, scrambler 11, IP data stream multiplexer 13, and QAM demodulator 14, and these devices are integrated in the chassis. The signal source part comprises many sets of PAL programs, all carry out video compression coding process by MPEG encoder 10, become the MPEG video flow of IP mode (common as MPEG-1, MPEG-2 or MPEG-4 etc.)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/913H04N7/167H04N5/00H04N21/433H04N21/435
Inventor 顾亚平
Owner SHANGHAI DIGIVISION
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