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Descrambling device and television system using descrambling device

A TV system and descrambling technology, applied in the field related to descrambling technology, can solve problems such as loss of chip manufacturers, and achieve the effect of avoiding malicious modification

Active Publication Date: 2014-03-26
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, once the software used to set the descrambling mode in the chip is cracked and modified (for example, turning on a function that was originally set to be disabled by the chip manufacturer), the descrambling chip that is scheduled to be sold to region A may be transferred to Region B is used, resulting in huge losses for chipmakers

Method used

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  • Descrambling device and television system using descrambling device
  • Descrambling device and television system using descrambling device
  • Descrambling device and television system using descrambling device

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Embodiment Construction

[0018] According to a specific embodiment of the present invention is figure 1 The shown descrambling device 100 includes a descrambling module 11 and a one time programmable module 12 . In practical applications, the descrambling device 100 can be integrated into various electronic devices (such as a TV system or a TV set-top box) that require descrambling, and can also exist independently.

[0019] The descrambling module 11 with multiple descrambling modes is used for descrambling an input data stream, and determines which mode should be used to descramble the input data stream according to the state of the one-time programmable module 12 . For example, the descrambling module 11 can determine according to the state of the one-time programmable module 12 whether to perform the descrambling procedure, the number of keys that can be accepted, which group of keys should be used in the descrambling procedure, or whether the descrambling procedure should be performed. Which des...

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Abstract

The invention provides a descrambling device comprising a descrambling module and a one-time programmable module. The descrambling module is used for descrambling an input data flow. When the one-time programmable module is in a first state, the descrambling module descrambles the input data flow in a first mode. When the one-time programmable module is in a second state which is different from the first state, the descrambling module descrambles the input data flow in a second mode.

Description

technical field [0001] The present invention is related to descrambling techniques. Background technique [0002] In order to protect their own rights and interests, TV program providers usually scramble the content of pay TV channels, and only provide key information required by the descrambling process to paid users. TV program providers in different regions may adopt different types and degrees of scrambling mechanisms. Digital video broadcasting common scrambling algorithm (DVB-CSA), which is widely used at present, specifies that two bits must be set in the file header of each image block to mark the image Whether the image content contained in the block has been scrambled, and which set of keys should be used to descramble. [0003] In order to strengthen the degree of protection, TV operators in some regions alternately use several keys to scramble video blocks. For example, the first 100 video blocks in the same video stream must be descrambled with the first key. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/4405
Inventor 曹定邦
Owner MEDIATEK INC