Federated DRM Playback Certification Without Shared Keys
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Solution Overview
Problem
Existing digital rights management systems face challenges in enabling secure playback of multimedia content while maintaining confidentiality of encryption keys, as content providers and player manufacturers often do not share keys, leading to insufficient access control and potential unauthorized use.
Innovation Solution
A federated system with a registration entity and trusted systems manages device registration and issues playback certifications, using multiple encryption keys and secure communication protocols to ensure only authorized devices can access content, without requiring central registration services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If content providers and player manufacturers share encryption keys, then access control is simplified and playback is easier, but security is weakened and key confidentiality is compromised
Solution Approach 1:
A trusted system acts as an intermediary between content providers and player manufacturers. The trusted system holds the master encryption keys and performs key derivation, allowing content providers to encrypt content without directly sharing keys with manufacturers. This mediator approach simplifies access control while maintaining security through the trusted intermediary.
Solution Approach 2:
The key management functionality is segmented into separate components: content providers handle content encryption, player manufacturers handle device-specific key derivation, and the trusted system manages master keys. This segmentation allows each party to operate independently with limited key exposure while maintaining overall system security and simplified access control.
2Device complexity
If a central registration service is used to manage all devices, then key distribution is simplified, but system complexity and single points of failure increase
Solution Approach 1:
The centralized registration service is segmented into distributed trusted systems deployed at multiple locations (content providers, manufacturers, aggregators). Each trusted system operates independently with its own key management capabilities, eliminating the single point of failure while maintaining simplified key distribution through the federated architecture.
Solution Approach 2:
The trusted system is designed as a universal multi-functional component that can be deployed by any entity in the content distribution chain (content providers, manufacturers, aggregators). Each instance performs the same key management functions independently, providing both simplified key distribution and improved reliability through redundancy.
3Reliability
If multiple encryption keys are used for different device classes, then security and access control are improved, but key management complexity increases
Solution Approach 1:
The system dynamically generates device-specific encryption keys based on the device's unique identifier and the content provider's master key. Instead of pre-configuring static keys for each device class, the trusted system performs dynamic key derivation at runtime, improving access control while keeping key management complexity manageable through automated processes.
Solution Approach 2:
Each device automatically derives its own encryption keys using its unique identifier and the content provider's master key through the trusted system. This self-service approach eliminates the need for manual key distribution and management for each device, improving access control while reducing key management complexity through automation.
Data Source
AI summary
Federated systems for issuing playback certifications granting access to technically protected content are described. One embodiment of the system includes a registration server connected to a network, a content server connected to the network and to a trusted system, a first device including a non-volatile memory that is connected to the network and a second device including a non-volatile memory that is connected to the network. In addition, the registration server is configured to provide the first device with a first set of activation information in a first format, the first device is configured to store the first set of activation information in non-volatile memory, the registration server is configured to provide the second device with a second set of activation information in a second format, and the second device is configured to store the second set of activation information in non-volatile memory.