US 2008/0313463 A1 · Method and Apparatus For Use in a Downloadable Conditional Access System

Abstract

In a downloadable conditional access system (DCAS), preferably all DCAS-specific code is implemented in a configurable secure (CS) processor that is in communication with the host processor. Preferably, no DCAS-specific code is executed in the host processor. The host processor delivers commands to the CS processor, which the CS processor performs to configure itself in accordance with the particular DCAS encryption scheme used by the DCAS. Once configured, the CS processor executes a DCAS software module that has been downloaded to the CS processor, which looks for the corresponding EMMs and ECMs, processes them to obtain the CW, and then uses the CW to decrypt the content stream.

Claims18

Dependent claims

An apparatus for providing conditional access (CA) in a downloadable CA system (DCAS), the apparatus comprising:

a host processor;
and
a configurable secure (CS) processor in communication with the host processor, the CS processor being configured to receive DCAS commands and content stream processing commands from the host processor and to configure itself in accordance with the received commands to parse and decrypt an encrypted content stream when the CS processor executes a DCAS software module that has been downloaded to the CS processor.

A method for use in a conditional access system (DCAS) comprising:

receiving a first DCAS software module in a configurable secure (CS) processor;
receiving a first set of DCAS commands and stream processing commands in the CS processor, the commands being sent to the CS processor by a host processor, the CS processor configuring itself in accordance with the CAS commands and stream processing commands;
receiving an encrypted content stream in the CS processor;
and
executing the downloaded CAS software module in the CS processor, wherein when the CS processor executes the downloaded CAS software module, the CS processor parses and decrypts the encrypted content stream.

2 more elements

A computer program for use in a downloadable conditional access system (DCAS), the program comprising instructions embodied on a computer-readable medium, the program comprising:

instructions for receiving a first DCAS software module in a configurable secure (CS) processor;
instructions for receiving a first set of DCAS commands and stream processing commands in the CS processor, the commands being sent to the CS processor by a host processor, the CS processor configuring itself in accordance with the DCAS commands and stream processing commands;
instructions for receiving an encrypted content stream in the CS processor;
and
instructions for executing the DCAS software module in the CS processor, wherein when the CS processor executes the DCAS software module, the CS processor parses and decrypts the encrypted content stream.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

11/764,292Filed 18 Jun 2007

Published

18 Dec 2008

Term ends

Not estimatedThe source records don’t support an estimate.

Classification17 codes

H04N 21/4405
Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering…
H04N 7/1675
Systems rendering the television signal unintelligible and subsequently intelligible: providing digital key or authorisation information for…
H04N 21/4181
External card to be used in combination with the client device, e.g. for conditional access: for conditional access
H04N 21/42623
For processing the incoming bitstream: involving specific decryption arrangements

Method and Apparatus For Use in a Downloadable Conditional Access System

Life of this patent

Method and Apparatus For Use in a Downloadable Conditional Access System

Life of this patent

Abstract

Claims18