Digital Content Watermarking Key Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current digital content copyright protection technologies face challenges such as low reliability in verifying copyrights through watermark extraction, difficulty in confirming copyrights due to forgery and key leakage, and inability to ensure both copyright confirmation and tracing across platforms.
Innovation Solution
A method and system that embed a watermark into digital content using a bound key, where only a pre-binding key is provided for verification, making it difficult for thieves to extract the watermark. Additionally, a dual-watermarking scheme is implemented, combining a copyright watermark with an evidence watermark, to enhance robustness and ensure copyright confirmation even under attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a digital watermarking technology is used to embed copyright information into digital content, then the binding between digital content and copyright information is strengthened, but the reliability of verifying copyright through watermark extraction decreases due to key forgery and leakage
Solution Approach 1:
The patent divides the key into two parts: a public key that can be freely distributed and a private key that must be kept secret. This segmentation allows the watermark embedding process to be publicly verifiable while maintaining security through the private key, resolving the contradiction between strong binding and verification reliability.
Solution Approach 2:
The patent introduces a trusted third party (copyright protection center) that acts as an intermediary to manage the key distribution and verification process. This intermediary ensures that only authorized entities can extract watermarks, maintaining verification reliability while allowing widespread distribution of the public key for embedding.
2Ease of operation
If a key is provided for watermark extraction verification, then copyright confirmation becomes possible, but key leakage and forgery make it difficult to ensure copyright protection
Solution Approach 1:
By segmenting the key into public and private components, the system allows easy copyright confirmation through public key verification while maintaining protection through the secure private key. The public key can be freely shared for verification purposes, but the private key remains protected, solving the contradiction between ease of operation and reliability.
Solution Approach 2:
The patent performs preliminary key generation and distribution before the actual copyright verification process. The public key is pre-distributed to authorized entities, and the private key is securely stored, enabling smooth verification operations while preventing key leakage and forgery through pre-established security measures.
3Productivity
If intermediate keys and encryption keys are stored locally for each user, then watermark extraction and copyright verification become efficient, but the local storage requirement increases significantly
Solution Approach 1:
The patent extracts the key management function from local storage and relocates it to a centralized server. Users only need to store their unique identification information locally, while the server maintains the master key and generates session keys for each user. This extraction significantly reduces local storage requirements while maintaining verification efficiency through server-assisted key management.
Solution Approach 2:
The server acts as an intermediary that handles all key generation, storage, and distribution operations. This intermediary service allows users to perform efficient watermark extraction without storing large amounts of key material locally, as the server provides the necessary keys on demand, resolving the contradiction between productivity and storage quantity.
Data Source
AI summary
A method for processing digital content includes: obtaining digital content; performing feature extraction on the digital content to obtain a digital content feature; generating an intermediate key based on at least the digital content feature and secret information of a user; binding at least the intermediate key to obtain an encryption key; and embedding a watermark of the digital content into the digital content based on the encryption key. When a key is submitted to a verifier, a pre-binding key may be provided alone. This avoids a risk of leakage of a key that is actually used for watermark embedding. When there is a large amount of media content, a user may locally store only secret information, without storing other intermediate keys or encryption keys. This reduces a local storage amount of the user.