Border Guard Between Security Domains for DRM Enforcement
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Solution Overview
Problem
Existing digital rights management (DRM) technologies primarily focus on controlling digital content within a user's domain, failing to address the secure transition and protection of content between different security domains during delivery and storage.
Innovation Solution
The introduction of a transport security domain and a persistent security domain, with a border guard enforcing DRM rules between them, ensuring secure content movement and storage, and the optional use of a portable renewable security card for enhanced security and rule enforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single security domain is used for content storage and delivery, then the system structure is simple, but security control during content transition is insufficient
Solution Approach 1:
The patent divides the security system into two distinct domains: a first security domain for content delivery and a second security domain for content storage. This segmentation allows independent security policies and control mechanisms for each domain, improving security control during content transition while maintaining clear domain boundaries that prevent excessive complexity.
Solution Approach 2:
The patent introduces a border guard as an intermediary component positioned between the first and second security domains. This border guard enforces transition rules and controls content movement between domains, providing enhanced security control without requiring complex integration of security mechanisms throughout the entire system.
2Reliability
If DRM rules are enforced only within user's domain, then the implementation is simple, but content protection during delivery and transition is insufficient
Solution Approach 1:
The patent segments DRM enforcement into two distinct phases: content delivery within the first security domain and content storage within the second security domain. Each phase has its own enforced transition rules, ensuring comprehensive content protection during delivery and transition while keeping the enforcement scope manageable through clear domain separation.
Solution Approach 2:
The border guard acts as an intermediary that enforces DRM transition rules between domains. This concentrated enforcement point provides robust content protection during the critical transition phase without requiring complex DRM implementation across all system components.
3Reliability
If content transition between security domains is unrestricted, then the system operation is flexible, but security violations and piracy risk increase
Solution Approach 1:
The border guard serves as a controlled intermediary that manages content transition between security domains. It enforces transition rules that prevent security violations and piracy while allowing legitimate content movement, thus maintaining security enforcement without completely restricting operational flexibility.
Solution Approach 2:
The patent implements dynamic transition rules that adaptively control content movement between domains. The border guard evaluates transition requests against enforceable rules, allowing flexible content movement when rules are satisfied while blocking unauthorized transitions, thus balancing security enforcement with operational flexibility.
Data Source
AI summary
The present invention discloses an apparatus and method for defining and enforcing rules of transition between two security domains, e.g., a transport domain and a persistent security domain. In turn, a border guard, e.g., a security device, is provided between these two domains that enforce rules for transition between the two security domains. This novel approach of defining a transport domain and a persistent security domain simplifies the classification of the digital content and its movement through the system. Namely, the border guard once established between the two systems can enforce DRM rules associated with how contents are moved between the two domains.