Broadcast Reception Device CAM Interface Protocol
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Solution Overview
Problem
Broadcast reception devices face difficulties in providing conditional access systems (CAS) from multiple providers due to the need to implement specific functions and operating methods required by each provider, making it challenging to manage scrambled content playback across various devices.
Innovation Solution
A broadcast reception device connected to a conditional access module (CAM) uses a control unit to transmit and receive data units that request and reply with information on the number of devices playing scrambled content, employing a protocol to manage and control the playback of scrambled content, including usage rules and encryption, thereby simplifying the process of handling multiple CAS providers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the broadcast reception device implements specific functions and operating methods required by each CAS provider, then it can provide CAS from multiple providers, but the device complexity increases significantly
Solution Approach 1:
The system is divided into two functional segments: the broadcast reception device handles common interface operations, while the CAM module handles provider-specific CAS operations. This segmentation allows the receiver to support multiple providers without increasing its own complexity, as each provider-specific function is isolated in separate CAM modules.
Solution Approach 2:
The common interface (CI) is designed with universal functionality to work with any CAM module from different providers. The CI slot and communication protocol are standardized, allowing the same receiver hardware to interface with multiple different CAS providers through interchangeable CAM modules, thus achieving multi-provider support without increasing device complexity.
2Reliability
If the broadcast reception device controls the number of external devices playing scrambled content, then usage rules compliance is improved, but the ease of operation decreases
Solution Approach 1:
The system automatically manages device playback limits through machine-to-machine communication between the broadcast reception device and external devices via the CI interface. The receiver autonomously enforces usage rules by controlling CAM module operations, eliminating the need for manual user configuration while ensuring compliance with copyright and licensing restrictions.
Data Source
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AI summary
A broadcast reception device is provided. The broadcast reception device includes a broadcast reception unit receiving a broadcast signal comprising scrambled content, and a control unit transmitting a first data unit and receiving a second data unit, wherein the first data unit comprises a request for information on the number of devices that play the scrambled content simultaneously with the broadcast reception device and the second data unit comprises a reply to the first data unit.