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PDF text encoding method

A text and document technology, applied in the field of PDF text garbled, can solve the problem that the absolute security of the document cannot be guaranteed, and achieve the effect of increasing business costs

Inactive Publication Date: 2017-06-13
FUJIAN FOXIT SOFTWARE DEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method cannot guarantee the absolute security of the document. Once decrypted, the content of the document, especially the text content and format, can be copied and edited at will

Method used

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  • PDF text encoding method

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Embodiment Construction

[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0014] figure 1 It is a flowchart of a PDF text garbled code method according to an embodiment of the present invention. As shown in the figure, the PDF text garbled method includes the following steps:

[0015] S110, when creating or saving the PDF document, embed the PDF font in the created or saved PDF document;

[0016] S120, changing the embedded PDF font encoding mapping ToUnicode dictionary in a random encoding manner;

[0017] S130. Change the encod...

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Abstract

The present invention discloses a PDF text encoding method. The method comprises the following steps: when creating a PDF document or saving the PDF document, embedding a PDF font in the created or saved PDF document; in a random encoding manner, changing the embedded PDF font code and mapping the Unicode dictionary; and changing the code of the PDF document text content to the random code.

Description

technical field [0001] The invention relates to the field of copyright protection, in particular to a PDF text garbled code method. Background technique [0002] PDF documents are at the end of the entire industrial chain of document creation, editing, protection, distribution, dissemination, and preservation. Many electronic documents are spread on the Internet in the form of PDF, how to protect the rights and interests of PDF document authors has become an urgent problem to be solved. [0003] The current popular method is to encrypt the document by setting a password or other methods through PDF permission encryption, allowing the reader to share the content of the document with limited permissions. However, this method cannot guarantee the absolute security of the document. Once decrypted, the content of the document, especially the text content and format, can be copied and edited at will. Contents of the invention [0004] The invention provides a PDF text garbled ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/10
CPCG06F21/10G06F2221/2107G06F21/6209H04N1/00838G06F40/126G06F21/60
Inventor 孟庆功
Owner FUJIAN FOXIT SOFTWARE DEV LTD
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