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Method and device for authorising conditional access

A technology for conditional access and authorization devices, applied in user identity/authority verification, electrical components, digital computer components, etc., can solve problems such as shutdown

Inactive Publication Date: 2012-07-18
IRDETO ACCESS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This problem becomes even more serious as broadcast services in mobile phone handsets begin to be deployed, as these devices are often turned off for relatively long periods of time in order to conserve battery power

Method used

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  • Method and device for authorising conditional access
  • Method and device for authorising conditional access
  • Method and device for authorising conditional access

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] exist figure 1 The head-end system 1 shown above as an example is adapted to generate an encrypted digital data product and an entitlement message for use in decrypting the encrypted digital data product. In one embodiment, an encrypted digital data product is a file provided with separate information implementing a digital rights management (DRM) system. Such information specifies the types of uses that may consist of encrypted data products. The files may be recorded on a data carrier such as an optical or magnetic disk. Alternatively, they may be downloaded by the receiver via a communications network including, for example, a cellular mobile telephone network, a satellite network and / or a cable or terrestrial broadcast network. In another embodiment, such as figure 1 As shown, an encrypted digital data product includes a set of one or more digital data streams consisting of digital data packets including a header and a payload. The header contains an identificat...

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PUM

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Abstract

A method of authorising conditional access to an encrypted digital data product, includes storing at least one set of entitlements in a secure device, each entitlement including a product identifier and expiry information, receiving entitlement control messages from a decoder system including a device for decrypting encrypted digital data products using control words, each entitlement control message including a product identifier, and in a first mode, returning at least one control word in response to an entitlement control message including a product identifier if the product identifier corresponds to a product identifier in a stored entitlement including expiry information indicating the entitlement to be valid, and, in a second mode, progressively adjusting a counter to a pre-determined value and returning at least one control word in response also to entitlement control messages including a product identifier if the product identifier corresponds to a product identifier in a stored entitlement including expiry information indicating expiry of the entitlement and if the counter is at a value between an initial value and the pre-determined value. The counter is set to an initial value to commence operation in the second mode upon receiving an entitlement control message including a product identifier corresponding to a product identifier in a stored entitlement that includes expiry information indicating expiry of the entitlement.

Description

technical field [0001] The present invention relates to a method for authorizing conditional access to encrypted digital data products, comprising: [0002] storing at least one set of entitlements in the secure device, each entitlement including a product identification number and expiration information, [0003] receiving entitlement control messages from a decoder system comprising means for decrypting an encrypted digital data product using the control word, each entitlement control message including a product identification number, and [0004] In a first mode, in response to an entitlement control message including a product identification number, if the product identification number corresponds to a product identification number in a stored entitlement including expiration information indicating that the entitlement is valid, then at least one control word is returned, and [0005] In the second mode, also in response to an entitlement control message including a produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/266H04N21/418H04N21/442H04N21/4627G06F21/00G06F21/10H04L9/36H04N7/167H04N7/173H04N21/4623H04N21/6334
CPCG06F21/10H04N21/26606H04N21/442H04N21/4627H04N21/4181G06F15/00H04L9/32G06F21/00
Inventor 杰拉尔德·J·德克沃纳·S·斯特里登阿尔伯特-詹·波斯查
Owner IRDETO ACCESS
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