Set-Top Box Watermarking for Digital Content Leak Tracing
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Solution Overview
Problem
Pay-TV operators face challenges in controlling the usage and leakage of digital content as it leaves the secure environment of set-top-boxes, leading to potential breaches and contractual issues due to the inability to identify unauthorized devices or 'man-in-the-middle' attacks.
Innovation Solution
A method where a master device generates and applies a watermark to digital content based on peripheral device identification data before transmission, allowing for identification of the source of leaks and enabling investigations to sanction malicious usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital content is transmitted from set-top-box to peripheral device without watermarking, then transmission simplicity is maintained, but content protection and leak identification capability deteriorates
Solution Approach 1:
The patent applies preliminary action by embedding watermarks in the digital content before transmission from the set-top-box to the peripheral device. The watermarking is performed in advance during the content delivery process, allowing identification of unauthorized devices before actual content leakage occurs. This resolves the contradiction by establishing protection mechanisms proactively rather than reactively.
Solution Approach 2:
The watermark acts as an intermediary element embedded within the digital content stream. It carries identification information without disrupting the primary content transmission function. The watermark enables traceability and identification of peripheral devices while maintaining the existing HDCP protection framework, thus adding protection capability without fundamentally changing the transmission system architecture.
2Measurement precision
If watermarking is applied to all digital content, then leak source identification capability is improved, but processing time and computational resources increase
Solution Approach 1:
The patent implements local quality by applying different watermarking strategies to different types of content or different transmission scenarios. Not all content requires the same level of watermarking complexity - the system can adjust watermarking intensity and methodology based on content sensitivity, device type, and transmission context. This reduces overall processing time while maintaining identification accuracy for high-risk content.
Solution Approach 2:
The watermarking system allows dynamic adjustment of parameters such as watermark strength, embedding frequency, and identification data complexity. By changing these parameters based on content priority and device trust level, the system achieves accurate leak source identification for critical content while minimizing processing overhead for routine transmissions.
3Reliability
If peripheral device identification data is collected and used for watermarking, then content protection is improved, but user privacy concerns and system invasiveness increase
Solution Approach 1:
The patent extracts only the minimum necessary identification data from the peripheral device for watermarking purposes, rather than collecting comprehensive device information. By taking out only the essential identifiers needed for content protection and leak traceability, the system maintains protection effectiveness while minimizing privacy intrusion. Superfluous data collection is eliminated.
Solution Approach 2:
The system allows peripheral devices to self-identify through standardized protocols during the normal HDCP handshake process. The identification data is voluntarily provided by the device as part of the authentication process, rather than being forcibly extracted or monitored. This frames the identification as a mutual agreement rather than surveillance.
Data Source
AI summary
A method for identifying a peripheral device from a digital content having been received by said peripheral device from a master device located at a user end is described. The master device can be connected to a server located at a back end, and the method includes receiving, by the master device from the peripheral device, at least peripheral identification data. The method also includes generating, at the master device, a first mark as a function of at least a part of the peripheral identification data, and watermarking the digital content using the first mark before transmitting the digital content to the peripheral device.