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Transmission system of supplying conditional access for transmitted data

A transmission system and transmitted technology, applied in the field of transmission systems, can solve the problem that the user cannot easily retrieve the authorization

Inactive Publication Date: 2009-06-10
IRDETO ACCESS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It should be understood that it is important that malicious users cannot easily withdraw authorization

Method used

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  • Transmission system of supplying conditional access for transmitted data
  • Transmission system of supplying conditional access for transmitted data
  • Transmission system of supplying conditional access for transmitted data

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0032] figure 1 An overview of the system according to the invention is given. The system includes a transmitter 100 connected to a plurality of receivers 120 , 130 and 140 via a communication network 110 . In such a transmission system, a plurality of data signals or a mixed signal is transmitted to a receiver through a transmitter 100 . Typically, the system includes many receivers. The receiver can be a separate device, or it can be embedded in another suitable device, like a set-top box, TV or PC. Through an input device, such as a keyboard or a remote control, the end user can usually control the receiver. The data coming out of the receiver is immediately rendered, eg displayed on a display device, or reproduced using an audio amplifier (either further processed, or stored for future use). Sending data from the sender to the receiver can be by broadcasting, like terrestrial broadcasting, satellite broadcasting or cable broadcasting. It is also possible to mix these ...

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PUM

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Abstract

A transmitter provides receivers conditional access to data transmitted via a network. A content encryptor is used to encrypt the data under control of a same authorization key before it is transmitted to all receivers. The transmitter has a storage with a plurality of device keys. A further encryptor is used for producing a key block with a plurality of entries, where each entry is associated with a respective one of the device keys. At least some of the entries contain a representation of the authorization key encrypted with the associated device key. The transmitter transmits the same key block to all receivers. The receiver has a subset of the device keys. A first decryptor is used to retrieve the authorization key by decrypting at least one entry of the key block that is associated with one of the device keys of the receiver. A second decryptor is used for decrypting the data under control of the authorization key.

Description

technical field [0001] The present invention relates to a transmission system for providing conditional access to transmitted data; the system includes a sender and a plurality of receivers, which are coupled together by a network. The invention also relates to transmitters and receivers used in such systems. Background technique [0002] In conventional conditional access systems, data is sent from one sender to multiple receivers. There are many forms of transmission, such as using terrestrial transmission, satellite transmission or cable transmission. Typically, data is broadcast (i.e. data is sent once and received by all eligible receivers). Access to this data is conditional, for example depending on whether a particular receiver pays a subscription fee. Such conditional data access services are implemented by encrypting the data (usually in the sender) under the control of the authorization key and sending the encrypted data to the receiver. In addition, the decry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/167G09C1/00H04L9/08H04L9/32H04N7/16
CPCH04N21/26613H04N21/4782H04N21/26606H04N21/4622H04N7/1675H04N21/4181
Inventor B·J·范里恩塞弗J·C·塔尔斯特拉A·A·M·斯塔林
Owner IRDETO ACCESS