Document watermark copyright information protection device based on Opentype vector outline fonts

A copyright information and protection device technology, applied in computer security devices, program/content distribution protection, electronic digital data processing, etc., can solve the problems of low robustness and complicated operation, and achieve high robustness and simple operation , Resistance to format adjustment attacks and print scan attacks
CN102495833AInactive Publication Date: 2012-06-13HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2012-06-13
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention discloses a document watermark copyright information protection device based on Opentype vector outline fonts, belongs to the fields of digital watermark technologies and document information protection in information safety, and aims to solve the problems of low robustness and complexity in operation of the conventional document watermark technology caused by conversion of a document into an image before a watermark is embedded. A font library management center module manages original standard font library information in which watermark information is not embedded, and provides comparison information; a document watermark copyright information embedding module generates specific watermark characters through selected Opentype fonts and embedded copyright information; a document watermark copyright information extraction module extracts the copyright information according to comparison parameters; a printed document pre-processing module scans a printed document, and performs image binarization, de-noising, positioning and refining to form continuous single-pixel curves; and a document watermark copyright information anti-scanning printing detection module extracts stroke parameters. The document watermark copyright information protection device based on the Opentype vector outline fonts is applicable to protection of document watermark copyright information.
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Description

technical field

[0001] The invention relates to a document watermark copyright information protection device, which belongs to the fields of digital watermark technology and document information protection in information security. Background technique

[0002] As an aspect of digital watermarking technology, document watermarking has attracted people's attention since 1995 and has become a hot spot in watermarking technology. According to the embedding principle and different carrier forms, the current document watermarking algorithms include watermarking algorithms based on word shifting and line shifting, and character feature watermarking algorithms. The watermarking algorithm based on word shifting and line shifting is to embed watermarks by slightly changing the distance between words and lines in the document. This type of algorithm is suitable for electronic documents described by PostScript such as PDF and PS files. This type of algorithm can resist binarization att...

Claims

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