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A digital fingerprint-based PDF document copyright protection method

A digital fingerprint and copyright protection technology, applied in the field of information hiding, can solve the problem of not many protection technologies, and achieve the effect of increasing redundancy, improving robustness and improving concealment.

Active Publication Date: 2016-11-16
ZHEJIANG STARSINO INFORMATION TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

The traditional technology is to protect files from the content provider. However, there are not many practical protection technologies for legitimate users who obtain content through normal channels and illegally disclose it.

Method used

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  • A digital fingerprint-based PDF document copyright protection method
  • A digital fingerprint-based PDF document copyright protection method
  • A digital fingerprint-based PDF document copyright protection method

Examples

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Embodiment Construction

[0036] The present invention provides a PDF document copyright protection method based on digital fingerprints. After the user applies for and obtains the authorization of the PDF file, the user's identification code (that is, the digital fingerprint) is embedded in the PDF file, and then distributed to the corresponding user; After the PDF file is leaked, the identity of the leaker can be determined by extracting the digital fingerprint. It can be seen that the key of this method is to hide the user's identity information in the PDF file it uses. Therefore, the digital fingerprint information to be hidden must have high robustness, and the hidden digital fingerprint can still be accurately identified after experiencing various attacks.

[0037] In order to achieve the above object, the present invention at first counts the size of all the character distances of the original PDF files that need to be encrypted, and obtains the character distance with the highest proportion (th...

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Abstract

The invention provides a digital fingerprint-based PDF document copyright protection method. The method comprises the steps of firstly, designing encryption rules; secondly, hiding digital fingerprints through the information embedding algorithm to obtain a cipher-carrying PDF file; thirdly, extracting the digital fingerprints through the information extraction algorithm to convert the cipher-carrying PDF file to a plaintext. The method can track the identity information of a document leaking person and provide a new layer of protection aside from traditional file protection; the method uses a mixed method to hide identity information and increases the redundancy of hidden information through cyclic embedding, thereby improving the robustness of hidden information, being capable of resisting multiple attack modes and guaranteeing high security of hidden information. The method has certain practical value and a certain market promotion prospect, and not only can be used for protecting secret documents of enterprises and offices but also can be widely applied to copyright protection.

Description

technical field [0001] The invention relates to the technical field of information hiding, in particular to a digital fingerprint-based PDF document copyright protection method. Background technique [0002] With the advent of the Internet age, the information industry continues to grow and develop, and paperless office has become the mainstream. A large number of internal documents of enterprises and institutions are stored and disseminated in the form of digital files, especially the most widely used PDF file format. However, due to the ease of dissemination and duplication of digital files, these files are easily leaked, and at the same time, the problem of digital media piracy is rampant. [0003] Based on the above reasons, digital rights protection (that is, DRM, Digital Right Management) has increasingly become the focus of people's research, and various file protection technologies emerge in endlessly. The general workflow of traditional technology is: 1) Encrypt di...

Claims

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Application Information

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IPC IPC(8): G06F21/16G06F21/60
CPCG06F21/16G06F21/602
Inventor 高超吕永强
Owner ZHEJIANG STARSINO INFORMATION TECH
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