Regional Conditional Access via Segmented Control Words
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Solution Overview
Problem
Current broadcast conditional access systems face challenges in enforcing fine-grained position-based access controls, as they rely on geographical resolution that is often too broad, and traditional blackout features are ineffective without precise user location tracking and require secure devices for enforcement.
Innovation Solution
A conditional access system that generates regional-specific control words for encryption, using a Headend system to broadcast these words and regional transmission apparatuses to distribute them, allowing only authorized devices in specific geographical sub-regions to decrypt content by combining control words from multiple sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional blackout features are used for geographical access control, then content can be blocked in specific areas, but the system requires secure devices and cannot achieve fine-grained position-based control
Solution Approach 1:
The patent divides the geographical area into multiple sub-regions, each with its own regional-specific control words. The Headend generates control words for different sub-regions, and regional transmission apparatuses distribute them locally. This segmentation enables fine-grained geographical control without requiring complex secure devices at user premises, as the control is achieved through distributed key management across multiple transmission points.
Solution Approach 2:
The patent introduces regional transmission apparatuses as intermediaries between the Headend and user devices. These intermediaries receive control words from the Headend and distribute them within their respective sub-regions. This intermediary layer enables precise geographical control by controlling which intermediaries distribute control words to which areas, eliminating the need for secure devices at user endpoints.
2Area of stationary object
If satellite content distribution is used, then wide area coverage is achieved, but fine-grained position-based access control cannot be enforced
Solution Approach 1:
The patent segments the wide satellite coverage area into multiple smaller sub-regions, each served by a regional transmission apparatus. The Headend generates different regional-specific control words for each sub-region. This allows the system to maintain wide area coverage through satellite while enforcing fine-grained position-based control by distributing different control words to different sub-regions, enabling precise geographical restriction within the broad coverage area.
Solution Approach 2:
The patent adds a dimensional layer to the satellite distribution system by introducing regional transmission apparatuses that operate at a intermediate level between the satellite and user devices. This creates a hierarchical structure where the satellite provides broad coverage and the regional intermediaries provide fine-grained control, effectively adding a spatial dimension of control to the otherwise uniform satellite broadcast.
3Measurement precision
If fine-grained position-based access control is implemented, then precise regional restrictions are achieved, but the system complexity increases
Solution Approach 1:
The patent segments the control function across multiple components: the Headend generates control words, regional transmission apparatuses distribute them locally, and user devices simply receive and use them. This segmentation distributes system complexity across manageable components rather than concentrating it in single complex devices, enabling fine-grained control while keeping individual device complexity low.
Solution Approach 2:
The regional transmission apparatuses autonomously receive control words from the Headend and distribute them within their respective sub-regions without requiring complex decision-making at user devices. The system enables itself to enforce geographical control through this self-service distribution mechanism, reducing the complexity burden on user-side devices while achieving precise position-based control.
Data Source
AI summary
In one embodiment, a system includes a control word processor to generate first regional-specific control word formation data items (RSCWFDI), for a first geographical sub-region of a primary geographical region which includes different geographical sub-regions, for use over cryptoperiods, the first RSCWFDI being used in generating control words in receiver-decoder devices, an encryption engine to encrypt content with the control words over the cryptoperiods yielding encrypted content, a first transmission apparatus to broadcast the first RSCWFDI and the encrypted content in the primary geographic region, and a communication interface to share data about second RSCWFDI of the first geographical sub-region with at least one regional transmission apparatus of the first geographical sub-region operative to broadcast the second RSCWFDI of the geographical sub-region in the geographical sub-region, wherein each control word may be generated in the receiver-decoder devices using one of first and one second RSCWFDI.