Display Output Compliance Verification via Content Path Authentication
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Solution Overview
Problem
Existing content protection schemes struggle to verify the compliance of display outputs, particularly in scenarios where display content can be maliciously rerouted from intended to unintended destinations, compromising the integrity and security of premium content.
Innovation Solution
A method and system that verify the connection status information associated with specific display attachment locations by receiving a signature representative of connection states, authenticating the integrity of the content path, and deciding whether to continue sending content to ensure compliance with content protection requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional graphics adapter processing is used, then content can be delivered to multiple display outputs, but content may be maliciously rerouted to unprotected outputs
Solution Approach 1:
The system performs preliminary verification of the content path by obtaining and validating connection status information before content is delivered to display outputs. This advance check ensures that only protected paths are used, preventing malicious rerouting while maintaining compatibility with multiple display types.
Solution Approach 2:
The graphics subsystem provides feedback about the actual content path by returning connection status information that indicates whether display outputs are protected or unprotected. This feedback loop allows the system to verify path integrity and make informed decisions about content delivery based on the current state of display connections.
2Reliability
If connection status verification is implemented, then content path integrity can be authenticated, but system complexity increases
Solution Approach 1:
The graphics subsystem performs self-verification by automatically obtaining, validating, and monitoring its own connection status information. This self-service approach eliminates the need for external verification systems, reducing overall system complexity while maintaining robust content path integrity authentication.
Solution Approach 2:
The connection status verification mechanism is designed to work across multiple display output types (HDMI, DisplayPort, analog) through a unified interface. This universal approach allows a single verification system to handle diverse display configurations, reducing complexity compared to implementing separate verification mechanisms for each display type.
3Productivity
If signature-based verification is used, then compliance can be determined efficiently, but false positives may occur
Solution Approach 1:
The system performs a preliminary signature verification as a quick first check, and only performs more thorough verification steps when the initial check indicates potential issues. This partial action approach maintains high productivity for compliant systems while applying additional verification only when necessary, minimizing false positives without sacrificing efficiency.
Data Source
AI summary
A method and system are implemented for verifying connection status information associated with a specific display attachment location. Specifically, one embodiment of the present invention sets forth a method, which includes the steps of receiving a first signature representative of a first set of connection states tracked by a graphics subsystem associated with the display attachment location, authenticating whether the integrity of a content path including the display attachment location is maintained based on the first signature, and deciding whether to continue sending the content to the display attachment location so that requirements associated with protecting the content are satisfied.