On-demand Switched Content Encryption for SDV Bandwidth Optimization
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Solution Overview
Problem
Current switched digital video (SDV) systems face challenges in efficiently managing bandwidth due to the need for entire duplication of streams and files when multiple encryption system types are requesting content, leading to increased processing and bandwidth overhead.
Innovation Solution
The implementation of automated on-demand switched content encryption, which dynamically encrypts content using multiple partial encryption techniques based on subscriber terminal encryption types, allowing for seamless transition between single partial encryption and full encryption, thereby conserving bandwidth and supporting multiple digital rights management (DRM) and conditional access (CA) systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If entire duplication of streams and files is performed for multiple encryption system types, then content security is improved, but bandwidth usage and processing overhead increase
Solution Approach 1:
The content stream is segmented into multiple encrypted versions, each corresponding to a specific encryption system type. Instead of duplicating entire streams for each encryption type, the system divides the content into segments that can be selectively encrypted and delivered based on subscriber terminal requirements, reducing overall bandwidth consumption while maintaining security.
Solution Approach 2:
Different portions of the content stream are encrypted using different encryption system types according to the specific requirements of subscriber terminals. The system applies encryption locally at the points where different encryption types are needed, rather than applying uniform encryption across the entire stream, thereby optimizing bandwidth usage while ensuring content security.
2Reliability
If entire duplication of streams and files is performed for multiple encryption system types, then content security is improved, but processing overhead increases
Solution Approach 1:
The processing workload is segmented by dividing content into manageable portions that can be encrypted independently for different encryption system types. This segmentation allows the headend to process and encrypt only the necessary segments for each subscriber terminal, reducing overall processing overhead while maintaining comprehensive content security coverage.
Solution Approach 2:
The system dynamically changes encryption parameters based on the specific requirements of subscriber terminals. By adjusting encryption parameters such as encryption type, key length, and algorithm selection according to terminal capabilities and content protection requirements, the system optimizes processing overhead while ensuring adequate security protection.
3Adaptability or versatility
If multiple encrypted streams are delivered for different encryption system types, then compatibility with diverse DRM and CA systems is improved, but bandwidth usage increases
Solution Approach 1:
The system implements a universal encryption framework that can deliver content encrypted for multiple DRM and CA systems through a single streamlined process. The headend is designed to handle multiple encryption system types simultaneously, providing multi-functionality that ensures compatibility with diverse subscriber terminals while avoiding the need for separate complete stream duplications, thereby reducing bandwidth usage.
Solution Approach 2:
The encryption delivery system is made dynamic by allowing real-time adjustment of encryption parameters and stream selection based on subscriber terminal requirements. The system can dynamically switch between different encryption system types and adjust the level of encryption applied to different content segments, ensuring broad compatibility while optimizing bandwidth utilization through adaptive stream delivery.
Data Source
AI summary
A number of encryption system types utilized by subscriber terminal devices currently requesting tuning to a particular switched digital video (SDV) content selection is determined in response to each change in a number of the subscriber terminals requesting tuning to the particular SDV content selection. SDV content associated with the particular SDV content selection is encrypted as either encrypted SDV content or multiply partially encrypted SDV content based upon the determined number of encryption system types beginning from a current play location indicated for the SDV content selection within an electronic program guide (EPG). Either the encrypted SDV content or the multiply partially encrypted SDV content is distributed as part of an outgoing SDV content stream to the subscriber terminals currently requesting tuning to the particular SDV content selection.