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Method for receiving multimedia content and captcha scrambled by means of control words

A multimedia content and control word technology, applied in selective content distribution, digital data authentication, television, etc., can solve problems such as loss of multimedia content providers, and achieve the effect of increasing reliability

Inactive Publication Date: 2016-03-23
VIACCESS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These attacks thus lead to the loss of the provider of the multimedia content

Method used

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  • Method for receiving multimedia content and captcha scrambled by means of control words
  • Method for receiving multimedia content and captcha scrambled by means of control words
  • Method for receiving multimedia content and captcha scrambled by means of control words

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Embodiment Construction

[0082] Hereinafter in this specification, features and functions well known to those skilled in the art will not be described in detail. Furthermore, the term used is that of a conditional access system for multimedia content access. For more information on this terminology, the reader is referred to the following literature:

[0083] "Functional Model of Conditional Access System", EBU Review, Technical European Broadcasting Union, Brussels, BE, n°266, 21 December 1995

[0084] figure 1 A system 2 for transmitting and receiving scrambled multimedia content is shown. The multimedia content is linearized multimedia content. For example, multimedia content corresponds to a series of audiovisual programs such as television broadcasts or movies.

[0085] The plaintext multimedia content is generated by one or more sources 4 and transmitted to a broadcaster 6 . The broadcasting device 6 broadcasts the multimedia content to many receiving terminals at the same time through the ...

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Abstract

The invention relates to a method of receiving a multimedia content scrambled with the aid of control words comprising: - the reception (101 a) by a security processor of ECM messages containing at least one cryptogram CW* of a control word CW, - the decryption (110) of this cryptogram CW*, and - the descrambling (110) of a scrambled multimedia content on the basis of the decrypted control word CW, - at least one implementation (114) of a captcha, from a reception terminal, whose correct response is contained in a memory of the processor and varies from one implementation to the other, - the processor acquires (116) at least one response to this captcha and compares (118) this response with the correct response contained in its memory, and - the processor limits (122) the descrambling of the cryptograms CW* if no response to this captcha corresponds to the correct response.

Description

technical field [0001] The invention relates to a method for receiving multimedia content scrambled by means of a control word. The invention also relates to a security processor, a terminal and an information recording medium for realizing the method. [0002] The invention is particularly applicable in the field of access control for the provision of premium multimedia programs as in pay television. Background technique [0003] Various methods of simultaneously broadcasting several multimedia contents are known. For this purpose, each multimedia content is broadcast on its own channel. Channels for transmitting multimedia content are also referred to as "stations". A channel usually corresponds to a TV station. This enables the user to select the multimedia content he wants to watch simply by changing the channel. [0004] In this specification, the term "multimedia content" refers more specifically to audio and / or video content designed to be presented in a form dir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/4405H04N21/418H04N21/442H04N21/4623G06F21/34G06F21/36
CPCG06F21/34G06F21/36H04L63/0435H04L63/08H04N7/1675H04N21/4181H04N21/4405H04N21/44218H04N21/4623
Inventor 艾达·高达戈
Owner VIACCESS SA