Digital Content Watermarking with Encrypted User Tracking
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Solution Overview
Problem
Conventional forensic watermarking systems have limited information capacity, making it difficult to store and manage large volumes of user tracking information, and are vulnerable to forgery and tampering, especially in database-based systems.
Innovation Solution
A method and apparatus for digital content watermarking that generates private and public keys, encrypts user identity and details, and stores the encrypted data in multiple databases or blockchains, ensuring secure storage and retrieval of user tracking information while preventing forgery and tampering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a large amount of user tracking information is embedded directly into the watermark, then the information capacity is improved, but the watermark becomes perceptible and loses its invisibility
Solution Approach 1:
The patent divides user tracking information into two parts: essential identification data (user ID) is embedded in the watermark, while detailed information (payment details, credit card information, hardware information) is stored externally in a database. This segmentation allows the watermark to remain invisible while still enabling comprehensive user tracking through the combination of watermark identification and database lookup.
2Quantity of substance
If conventional database-based systems are used to store user tracking information, then the storage capacity is improved, but the system becomes vulnerable to forgery and tampering
Solution Approach 1:
The patent applies encryption to user tracking information before storing it in the database. The encryption is performed in advance using a predetermined algorithm, so that even if the database is compromised, the stolen data remains unintelligible without the decryption key. This preliminary security measure prevents forgery and tampering while maintaining large storage capacity.
3Object-affected harmful factors
If minimum information is embedded in the watermark, then the watermark remains imperceptible, but the ability to trace users is reduced
Solution Approach 1:
The patent introduces a database as an intermediary between the watermark and the complete user tracking information. The watermark contains only the user ID, which serves as a key to retrieve detailed tracking information from the database. This intermediary approach allows the watermark to remain imperceptible while the system retains full user tracking capability through the database connection.
Data Source
AI summary
A method and apparatus for watermarking digital content and a data extraction method are disclosed. The digital content watermarking method includes: generating private and public keys corresponding to the user terminal; generating watermark data containing user identity information corresponding to the user terminal and user details associated with the watermark data; generating encrypted data by encrypting the watermark data and the user details with the private key; transmitting the watermark data, the encrypted data, and the public key to a server; receiving digital content when authorized by the server; and watermarking the digital content with the watermark data.