Digital Watermarking for Telecommunication Content Protection
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Solution Overview
Problem
Existing content protection methods in telecommunication networks are inadequate in preventing illegal copying and distribution, as they can be bypassed by screen scraping techniques, which allow pirated content to be shared online, and require external services for verification, leading to scalability issues.
Innovation Solution
A method using a controlling device that embeds robust and non-robust digital watermarks in content, where the robust watermark survives copying attempts and the non-robust watermark includes a decryption key, allowing filters to verify content integrity without external services, by analyzing the content itself.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption and dedicated players are used to protect content, then copy protection is improved, but screen scraping can still bypass the protection
Solution Approach 1:
The patent applies preliminary action by embedding watermarks into the content before distribution. The robust watermark is embedded in advance to survive potential copying operations, while the non-robust watermark with decryption key is embedded to enable future verification. This proactive approach prevents screen scraping bypass by ensuring the content carries inherent verification mechanisms from the outset.
Solution Approach 2:
The patent uses watermarks as an intermediary element between the content and the verification system. Rather than relying solely on encryption and dedicated players, the watermark acts as a mediator that can be detected by filter devices in the network to identify and block pirated content. This intermediary mechanism provides an additional layer of protection that is independent of the playback device.
2Reliability
If external services are used to verify content integrity, then verification capability is improved, but scalability is reduced
Solution Approach 1:
The patent implements self-service by enabling filter devices to autonomously verify content integrity using the embedded watermarks and decryption keys. Each filter device in the network can independently extract and verify the robust watermark without needing to communicate with external verification services. This self-contained verification mechanism eliminates the scalability bottleneck of centralized external services while maintaining reliable content integrity checking.
3Stability of the object's composition
If robust watermarking is used to survive copying, then watermark durability is improved, but the decryption key must be embedded separately
Solution Approach 1:
The patent applies segmentation by dividing the watermarking system into two distinct components: a robust watermark that survives copying operations and a non-robust watermark containing the decryption key. This segmentation allows each watermark to serve its specific function optimally - the robust watermark ensures durability through copying while the non-robust watermark provides the verification capability. The segmentation reduces complexity by clearly separating the concerns of durability and key distribution.
Solution Approach 2:
The patent employs asymmetry by using two watermarks with fundamentally different properties - one robust and one non-robust. This asymmetric approach is more efficient than attempting to create a single watermark that is both robust and contains decryptable keys, as the conflicting requirements would complicate the embedding system. The asymmetric design allows the robust watermark to focus on survival through copying while the non-robust watermark focuses on providing verification keys.
Data Source
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AI summary
For filtering messages containing illegally copied content that are distributed within a telecommunication network (TN), a controlling device (CD): receives a request from a user terminal (UTO), the request containing a content, calculates a unique value (UV) of at least a fragment of the content, encrypts the unique value with an encryption key into an encrypted unique value (EUV), generates a digital watermark (DW) corresponding to the encrypted unique value and embedding the digital watermark (DW) in the content, sends a response to the user terminal (UTO), the response containing the content with the embedded digital watermark. A filter server (FS) filters messages within a telecommunication network based on comparing encrypted unique value embedded in a digital watermark with an expected unique value computed from the content.