Digital Broadcast Video Receiving Circuit Conditional Access
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Solution Overview
Problem
Conventional conditional access devices for digital TV often receive and store digital broadcasting content without proper encoding, leading to inadequate protection against unauthorized copying and access.
Innovation Solution
A digital broadcast video receiving circuit with multiple decoder circuits and an encoding circuit that can handle various encoding formats (DES, TDES, CSA, AES) to encode and decode digital data packets using secret keys, ensuring conditional access and copy protection by re-encoding and re-decoding the content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If digital broadcast content is received and stored without encoding, then storage simplicity is improved, but security against unauthorized copying deteriorates
Solution Approach 1:
The patent applies preliminary action by encoding the digital broadcast content with secret keys before storage. The content is pre-protected through encryption using multiple encoding formats (DES, TDES, CSA, AES) so that when stored, it remains secure against unauthorized access. This preliminary encoding ensures security is built-in before the storage operation completes.
Solution Approach 2:
The patent changes the parameter of content protection by transforming the content from unencoded to encoded form using multiple secret keys and encoding formats. This parameter change from plain to encrypted state ensures that the stored content maintains security while being stored, resolving the contradiction between storage simplicity and security.
2Adaptability or versatility
If multiple decoder circuits with multiple encoding formats are implemented, then adaptability to different digital TV transmission standards is improved, but device complexity increases
Solution Approach 1:
The patent implements universality by designing decoder circuits that can handle multiple encoding formats (DES, TDES, CSA, AES) within a unified architecture. The system is built to be multi-functional from the start, capable of processing different digital TV transmission standards through integrated decoder circuits that support various encoding schemes, thereby achieving adaptability without proportionally increasing complexity.
Solution Approach 2:
The patent applies dynamics by making the decoder circuit configuration adaptable and reconfigurable. The system can dynamically select and activate the appropriate decoding path based on the incoming signal format, allowing the device to handle multiple standards through a flexible, dynamic architecture rather than rigid fixed circuits for each standard.
3Reliability
If content is re-encoded with secret keys before storage, then copy protection is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary action by performing the encoding with secret keys as a preliminary step before storage. This upfront encoding ensures copy protection is established before the content enters storage, making the protection process efficient by completing it in advance rather than during or after storage operations.
Solution Approach 2:
The patent maintains continuity of useful action by integrating the encoding process seamlessly into the reception and storage workflow. The encoding operation continues smoothly as part of the data pipeline, ensuring that copy protection is applied without significant interruption or delay to the overall processing flow, thereby minimizing time loss.
Data Source
AI summary
A digital broadcast video receiving circuit includes a plurality of decoder circuits configured to decode an encoded digital broadcast video signal according to respective plurality of encoding formats to provide a digital data packet based on the encoded digital broadcast video signal. An encoding circuit is coupled to the plurality of decoder circuits and is configured to encode the digital data packet to provide a re-encoded digital data packet, related methods, and computer program products.