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Method for recording an elapsed time period in a security module

A security module and time technology, applied in data recording, recording signal processing, recording information storage, etc., can solve the problems that the date and time cannot be provided regularly, the actual duration of 24 hours cannot be determined, and the time clock is not configured.

Inactive Publication Date: 2009-05-20
NAGRAVISION SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In most cases the PVR does not have a back channel linking it to the management center; the current date and time cannot be regularly provided to the security module by means of security directly from the management center
[0024] Another aspect of the problem lies in the fact that the security module, while having a security memory, is not equipped with an actual time clock and thus cannot determine an actual duration such as 24 hours using its own means

Method used

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  • Method for recording an elapsed time period in a security module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] The detachable security module SM issues the necessary authority to decrypt the audio-visual data stream from the management center CG, and to decrypt the content recorded on the hard disk DD. In addition to the rights validity duration, the security module SM also contains the validity start date / time provided by the clock RTC.

[0047] The PVR acts on the one hand as an online decoder of the transmitted audiovisual data streams and, on the other hand, as a data recorder for their subsequent viewing.

[0048] In a first mode of use, said online decoder, the ECM containing access conditions and time information is sufficient to manage rights based on a duration, since the control messages ECM already contain time data allowing to determine the duration of rights.

[0049] In the second mode, where the content is recorded and viewed later, the time information of the control messages ECM is ignored, in which case the time data from the decoder PVR is used to calculate th...

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PUM

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Abstract

Example embodiments are directed to a duration computing method in a security module inserted into an apparatus including an internal clock. The apparatus may receive a digital data stream encrypted via control words contained in a control message ECM. The method may include receiving data coming from the internal clock of the apparatus including a current temporal information, storing the data representing the current temporal information in the security module, receiving the control message ECM to decrypt at least one control word, reading previous data representing a previous temporal information at a moment of processing the previous control message ECM, and processing the control message ECM when the current temporal information is temporally ahead of the previous temporal information.

Description

technical field [0001] The invention relates to the field of security modules inserted in devices for receiving encrypted digital data. In particular, the purpose of the method of the invention is to provide the security module with the date and current time and to manage the decryption rights according to the validity duration of the data received or stored in the device. Background technique [0002] This method is used, for example, in digital video recorders for receiving and storing pay television programmes. [0003] A digital video recorder, hereinafter referred to as a PVR (Personal Video Recorder), is a Pay-TV receiver / decoder equipped with a hard disk, which allows the storage of encrypted audio / visual digital data so that it can be viewed at a later time. [0004] PVRs such as VHS type video tape recorders also feature fast forward and reverse operation. These functions allow, for example, to search for a particular sequence in the data recorded on the hard disk...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/16H04N7/167G06F1/00G11B20/00G06F21/10G06F21/72
CPCG11B20/00086H04N7/163H04N21/4623G06F21/725G06F21/10H04N21/26606G11B20/0021H04N7/1675G11B20/00224G11B20/0084H04N21/4147H04N21/4181G06F2221/0797G11B20/0071G11B20/00492G06F21/109G11B20/10
Inventor 奥利维尔·布瑞克吉米·库查德
Owner NAGRAVISION SA