Source Authentication for Collaborative Content Screening
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Solution Overview
Problem
Current content screening technologies face challenges in differentiating between legitimate and pirated content, particularly in collaborative content screening scenarios, where free-to-air TV content and pay television signals cannot be distinguished from unencrypted pirate signals, leading to ineffective watermark enforcement and piracy issues.
Innovation Solution
The implementation of a source authentication architecture that uses Cinavia signed messages and DTCP/HDCP link protection to verify the authenticity of content sources, ensuring that only compliant devices perform content screening operations, and employing a list of Source Authentication Compliant Technologies (SACT) to differentiate between legitimate and pirated content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If collaborative content screening is performed across multiple devices, then content screening operations can be distributed and performed by different connected devices, but the ability to differentiate between legitimate and pirated content is lost
Solution Approach 1:
The sink device performs source authentication before executing content screening operations. The authentication process verifies the source device's legitimacy by checking content credentials and policies in advance, ensuring that only authorized devices can perform screening. This preliminary verification step prevents pirated content from being screened while allowing legitimate collaborative screening to proceed.
2Reliability
If source authentication is implemented to verify content credentials, then legitimate content can be differentiated from pirated content, but the complexity of the authentication process increases
Solution Approach 1:
The patent introduces an intermediary authentication mechanism where the sink device acts as a mediator between the source device and the content protection system. The sink device receives content credentials from the source device, verifies them against authentication policies, and makes authentication decisions. This intermediary approach distributes the authentication complexity across devices rather than concentrating it in one location, making the overall system more manageable.
3Reliability
If watermark extraction and enforcement are performed, then content protection is strengthened, but the risk of false enforcement on legitimate content increases without proper authentication
Solution Approach 1:
The system performs preliminary authentication of the source device before allowing watermark extraction and enforcement operations. By verifying content credentials and authentication policies in advance, the system prevents false enforcement on legitimate content. The authentication step acts as a protective measure that blocks unauthorized watermark operations while allowing legitimate ones to proceed, thereby eliminating the harmful effect of false enforcement before it can occur.
Data Source
AI summary
Content screening operations, which can include watermark extraction and the application of content usage enforcement actions, may be organized such that some or all of the operations can be conducted by different devices that are connected via connectors such as HDMI (High-Definition Multimedia Interface (HDMI), analog composite video, DVI (Digital Visual Interface), SDI (Serial Digital Interface), DisplayPort, or networked via Ethernet or wireless. Authentication and encryption methods are disclosed that can be used to establish the trust and secure communication between devices that conduct collaborative content screening. Delegation architecture may be based on ascertained screening capabilities of the sink device wherein the source device verifies that the sink device is capable and trusted to perform partial or whole screening operations delegated by the source. Alternatively, delegation architecture may be based on ascertained screening capabilities of the source device wherein the sink device verifies that the source device is capable and trusted to provide correct content credential and content use policy (“content credential”) that is needed for the sink device to determine whether content screening should be performed, and if yes, what content screening operations should be performed.