Encrypted Screen Watermarking for Unauthorized Photo Traceability
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Solution Overview
Problem
Existing digital watermarking technologies do not effectively prevent unauthorized screen photography, compromising security and traceability.
Innovation Solution
A method and apparatus for encrypted image watermarking that generates a digital security mark using a device code and current time information, displayed in a preset area of a display device, which can be decrypted to trace unauthorized photography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital watermarking technology is used to protect information security, then copyright protection and anti-counterfeiting traceability are improved, but the screen can still be photographed without permission
Solution Approach 1:
The patent applies preliminary action by embedding a dynamic security mark on the display screen before any unauthorized photography occurs. This security mark contains encrypted device identification information and changes over time, so that when someone takes a photo of the screen, the photograph automatically captures the security mark which can later be used to trace and identify the device that displayed the copyrighted content, thereby preventing unauthorized sharing
2Reliability
If a digital security mark is displayed on the screen to enable traceability, then unauthorized photography prevention is improved, but the display area and visual quality are reduced
Solution Approach 1:
The patent applies local quality by placing the security mark in a specific local region of the display screen (typically in a corner or along the edges) rather than covering the entire display area. This allows the majority of the screen to maintain full display quality and area, while the localized security mark region provides the necessary traceability functionality with minimal impact on overall display performance
Solution Approach 2:
The patent uses copying by creating a visual representation (the security mark) that encodes device identification information in a format that can be captured by camera sensors. The security mark is designed to be photographable while containing encrypted data, allowing the information to be copied into the photograph without requiring additional physical media or affecting the original display content
3Reliability
If encryption algorithm is used to generate digital security mark, then security and traceability are improved, but computational complexity increases
Solution Approach 1:
The patent applies parameter changes by using a preset encryption algorithm that transforms device identification information and time parameters into a security mark with specific visual characteristics. The encryption process changes the parameters of the data (from readable text to encoded visual patterns) while maintaining a balance between security strength and computational efficiency, allowing the security mark to be generated and processed without excessive computational burden
Data Source
AI summary
A method of processing encrypted image watermarking, an apparatus and a display device are provided, which relates to the field of digital watermarking. The method includes: obtaining a device code of a display device and current time information, where the device code uniquely identifies the display device; generating, according to a preset encryption algorithm by using the current time information and the device code, a digital security mark; and displaying the digital security mark in a preset display area of the display device. The technical solution of the present disclosure can prevent the screen from being photographed without permission.