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Method for controlling the billing of a broadcast service by units of time

A time and unit technology, applied in the field of receiver/decoder of conditional access service, can solve the problems that the security module does not have an internal clock, the security module cannot use the decoder, and the application of the principle of equality, etc.

Inactive Publication Date: 2005-06-29
NAGRAVISION SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, several limitations associated with encrypted transmission systems for pay television do not allow the application of the same principle to e.g. telephony
[0013] The fact that the Security Module (SC) has no internal clock and is placed outside the decoder means that the SC cannot use the functionality of the decoder

Method used

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  • Method for controlling the billing of a broadcast service by units of time
  • Method for controlling the billing of a broadcast service by units of time
  • Method for controlling the billing of a broadcast service by units of time

Examples

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no. 1 example

[0036] According to a first embodiment, the current time is transmitted using ECM information. In this case, it is necessary to introduce a preliminary stage, that is, to control whether the Rdate variable is not enough in the future. This situation is possible when retransmitting the same program, for example due to the use of a digital video recorder (DVR). Without this verification, the last few seconds of a program transmission may be transmitted to fix the variable at the moment corresponding to the end of the program transmission, and then all program transmissions may be transmitted from the beginning. Since the Rdate variable is then always compared with the start of the program transmission in the future, the control of authorization is positive without any accounting unit.

[0037] In this way, if the Rdate variable is greater than the sum of the current time and the specified time (Rdate>TC+AT), then it is considered that the Rdate variable is invalid, and the secu...

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Abstract

The object of the present invention is to propose a method of accounting for the use of services that will be priced in units of time transmitted to decoders in a system that provides content encrypted by control words according to a period called the decryption period Modify the control word. The method consists in verifying whether a time variable (Rdate) representing the authorized time to use the service contains the current time (TC), if so, decrypting the control word and sending it back to the decoder, if not, then An amount (CT) corresponding to the time of use (AT) is deducted and the time variable (Rdate) is recharged with a corresponding time.

Description

technical field [0001] The present invention relates to the field of receiver / decoders for conditional access services, and more particularly to accounting procedures for the receipt and use of conditional access content. Background technique [0002] Depending on the content, we know of information services about stock exchanges, weather, general television, sports events, or other information. The content can be delivered to subscriber units such as pay TV decoders, computers, or even mobile phones, palmtops, PDAs, radios, televisions, or multimedia workstations. [0003] Encrypting digital streams so that their use can be controlled and the conditions of such use can be specified. The encryption is performed by means of a control word that changes over a fixed time interval (between 5 seconds and 30 seconds) in order to thwart any intrusion attempting to discover the control word. [0004] For a subscriber unit capable of decrypting a digital stream encrypted by a contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/10G06F21/60G06F21/62G06Q30/00G06Q50/00G09C1/00H04N1/00H04N7/16H04N21/2543H04N21/4408
CPCH04N21/4185H04N21/4623H04N21/8456H04N7/162H04N21/26606H04N21/2543H04N21/4408
Inventor 吉米·科沙尔亨丽·库德洛斯基马尔科·撒西尔利
Owner NAGRAVISION SA