CDN Edge Digital Watermarking for Scalable Leak Traceability
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Solution Overview
Problem
Existing content delivery networks lack effective security measures to protect against malicious attacks and fraudulent content distribution, particularly in the context of digital rights management and digital watermarking, necessitating improved computational efficiency and scalability.
Innovation Solution
A method of digital watermarking at a content distribution network node involves receiving data with encrypted and non-encrypted segments, embedding recipient-specific watermarks in non-encrypted segments, and transmitting modified data to recipients, utilizing edge servers for efficient and scalable watermarking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital watermarking is applied to all content segments including encrypted segments, then security protection is improved, but computational overhead increases significantly
Solution Approach 1:
The content stream is divided into encrypted segments and unencrypted segments. Digital watermarking is selectively applied only to unencrypted segments, which are typically metadata, headers, or other non-critical data portions. This segmentation approach maintains security protection capabilities while significantly reducing computational overhead compared to watermarking the entire content stream.
Solution Approach 2:
Different parts of the content stream receive different treatment regarding watermarking. Unencrypted segments are watermarked with recipient-specific identifiers, while encrypted segments remain unchanged or receive minimal processing. This local quality differentiation optimizes the balance between security and computational efficiency.
2Reliability
If recipient-specific digital watermarks are embedded in content, then security and traceability are improved, but processing time increases
Solution Approach 1:
Recipient-specific digital watermarks are embedded in unencrypted segments during the content delivery process before potential leakage or unauthorized distribution occurs. This preliminary action ensures that if content is stolen or pirated, the source can be traced back to the specific recipient, while minimizing processing time by limiting watermarking to only unencrypted portions.
3Reliability
If digital watermarking is implemented across the entire CDN network, then security coverage is improved, but system complexity and scalability are worsened
Solution Approach 1:
The CDN network utilizes existing infrastructure components (edge servers, content delivery mechanisms) to perform digital watermarking functions. By making existing components multi-functional (handling both content delivery and selective watermarking), the system achieves broad security coverage without proportionally increasing system complexity or requiring dedicated watermarking hardware at each node.
Data Source
AI summary
Systems and methods for digital watermarking at a content distribution network, CDN, node are described, whereby source data intended for at least one recipient is received from an origin server, the source data including a plurality of encrypted segments interleaved with at least one non-encrypted segment. Metadata is detected in the source data, the metadata identifying each non-encrypted segment, and in response, the source data is modified for each recipient, by embedding a recipient-specific digital watermark to at least a portion of a non-encrypted segment in the source data. The modified source data is then transmitted to each respective recipient. Other embodiments are also described and claimed.