Set-Top Box Watermark Embedding for Secure Media Distribution
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Solution Overview
Problem
Existing methods for preventing unauthorized distribution of media content from user devices, such as set-top-boxes, are insufficient when forwarding content from one device to another, leading to concerns for content providers about content protection and distribution.
Innovation Solution
A method and system that embeds a watermark with data identifying the user device into media content before transmission to other devices, allowing tracing of the content back to its original source, while maintaining security and quality by altering specific bits in the encoded media content, and using DLNA guidelines for network transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If content is transmitted from user device to other devices without watermarking, then content quality and transmission simplicity are maintained, but content security and traceability deteriorate
Solution Approach 1:
The watermark is embedded in the encoded content before transmission to other devices, performing the protection action in advance. This preliminary watermarking ensures that when content is later transmitted or copied, the identification data is already present, enabling traceability without adding complexity to the transmission process itself.
Solution Approach 2:
The watermark embedding is applied selectively only to content being transmitted to other devices, not to content being displayed locally. This localized application maintains content quality for local viewing while providing security for distributed content, avoiding unnecessary processing complexity for non-transmitted content.
2Reliability
If watermark is embedded in decoded content, then traceability is achieved, but content quality deteriorates due to re-encoding
Solution Approach 1:
The watermark is embedded in the encoded content before decoding and transmission, performing the modification action before the content enters the decode-transmit cycle. This timing avoids the quality degradation that would result from re-encoding watermarked decoded content, while still achieving traceability through the embedded identifier.
3Ease of manufacture
If all bits in media content are altered to embed watermark, then watermark embedding is simple, but content quality deteriorates
Solution Approach 1:
The system identifies and modifies only specific bits within the encoded content that are suitable for watermark embedding without affecting content quality. This selective bit modification approach embeds the watermark in a targeted manner, making the process manageable while preserving the quality of the media content through intelligent bit selection.
4Adaptability or versatility
If content is transmitted to multiple devices without identification, then distribution ease is improved, but security control deteriorates
Solution Approach 1:
The watermark embedding mechanism provides multiple functions simultaneously: it enables content traceability to the source device, provides security control for distributed content, and maintains transmission flexibility to multiple devices. This single watermarking approach serves universal purposes of identification, security, and distribution management.
Solution Approach 2:
The embedded watermark provides feedback information about the source device identity in the transmitted content. This feedback mechanism allows content providers to trace distributed content back to its origin, enabling security control and monitoring of content distribution across multiple devices without restricting distribution flexibility.
Data Source
AI summary
A method is provided for transmitting media content from a media content receiving device such as a set-top-box to one or more user devices capable of displaying, storing or outputting the media content. The method includes receiving, at the set-top-box, media content encoded according to a particular format, embedding in the media content, while it is encoded according to the particular format, a watermark containing data identifying the set-top-box and then transmitting the watermarked media content to one or more user devices. Encoding a watermark while the content is encoded according the received format allows protection to be added and the content passed to other devices without having to decode the content first. The method may be implemented by a suitable media content receiving device operating a computer program. A corresponding apparatus for implementing the method is provided.