Dynamic Marker Embedding for Content Leak Detection

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Solution Overview

Problem

Existing methods for preventing content leak, such as watermarking, are ineffective in detecting the leaker as they can be easily removed and do not provide a straightforward way to identify the viewer responsible for unauthorized duplication.

Innovation Solution

A method and apparatus that add markers indicating viewer information to content, determining the marker form and placement based on viewer data, making it difficult for the viewer to detect the marker and ensuring it remains intact even if the content is leaked.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a watermark is added to content to prevent unauthorized duplication, then content protection is improved, but the watermark decreases visibility of the content and can be easily deleted

Engineering Contradiction:

Improvecontent protectionVSAvoidvisibility degradation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the parameters of the marker by dynamically adjusting its color, position, and size based on content attributes and viewer information. The marker color is selected from multiple candidates to match content characteristics, making it less detectable. The position is determined algorithmically rather than fixed, and the size adapts to content features, thereby improving protection while minimizing visual impact.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements dynamic marker characteristics that change based on content attributes and viewer information. The marker is not static but adapts its properties (color, position, size) according to the specific content being protected and the viewer's identification information, making it more difficult to detect and remove while maintaining protection effectiveness.

Inventive Principle:

Principle #15Dynamics

2Reliability

If a watermark is added to content to prevent unauthorized duplication, then content protection is improved, but the watermark can be easily deleted and does not provide straightforward leaker detection

Engineering Contradiction:

Improvecontent protectionVSAvoidleaker detection capability

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent segments the viewer identification information into multiple characters and distributes them as separate markers across different positions in the content. Each marker corresponds to a specific character of the viewer ID, creating a distributed watermarking system that is more difficult to remove completely and provides clear leaker identification when detected.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses color changes as a core mechanism for the markers. The marker color is selected from multiple candidate colors based on content attributes, and the color itself encodes information about the viewer identification. This makes the marker less detectable through color matching while maintaining its identification function.

Inventive Principle:

Principle #32Color changes

3Difficulty of detecting and measuring

If markers are added to content to enable leaker detection, then leaker detection capability is improved, but the markers may be detected by viewers

Engineering Contradiction:

Improveleaker detection capabilityVSAvoidmarker detectability by viewer

Core Design Contradiction:

Difficulty of detecting and measuringVSObject-affected harmful factors

Solution Approach 1:

The patent dynamically changes marker parameters (color, position, size) based on content attributes and viewer information to make markers less detectable. By adapting marker characteristics to match content features and using algorithmic position determination, the markers become less obvious to viewers while maintaining their function for leaker detection.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates multiple copies of marker characters distributed throughout the content rather than using a single prominent watermark. Each character of the viewer ID is represented as separate markers at different positions, which reduces the visual impact of any single marker while collectively providing robust leaker detection capability.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS11790476B2Method, apparatus, and program for preventing content from leaking out

Publication Date: 2023.10.17 NAVER WEBTOON LTD

AI summary

Provided is an apparatus for preventing a content leak, including: a view request receiving unit for receiving a content view request for view target content to obtain content viewer information; a marker form determining unit for determining a marker form regarding a location of the view target content where a marker for each character is added, according to the content viewer information; a marking method determining unit for determining a marking method regarding a type or order of markers added to the marker form; and a modified content generating unit for generating modified content by adding, to the view target content, one or more markers corresponding to the content viewer information, based on the marker form and the marking method.