A method of affixing an electronic seal in a pdf file

Abstract

The invention relates to a method for affixing an electronic seal to a PDF file. The steps include: obtaining a packaged source data list, and calling a third-party component to create a PDF temporary file; adding a watermark to the PDF temporary file; adding a watermark to the PDF The electronic seal image is nested in the temporary file to generate the final PDF file. The invention generates a PDF file through a programming language, processes the scanned electronic seal picture and generates a corresponding algorithm, and adds a seal to the PDF file in real time. Since the electronic seal is in image format, in the process of generating PDF, the position and size of the seal can be directly calculated in the background through a certain algorithm and added to the PDF file. There is no need to manually add the seal later, and it can be completed in one go. It ensures the security and integrity of the electronic documents output in the project, without adding additional configuration or cost.

Description

Technical field [0001] The present invention relates to the application field of computer software programming, in particular to a method for stamping an electronic seal in a PDF file, which uses a programming language to generate the PDF file and stamps the electronic seal in the process of generating the PDF file. Background technique [0002] For electronic official document information that needs to be protected during network transmission, certain measures are generally taken to ensure the security and integrity of the document. For example, an electronic seal can be added to simplify the office process, increase the circulation speed of the official document, and prevent the document from being forged. Or the data has been tampered with. According to the degree of use of this security measure, the methods used are: [0003] l) The method of using Adobe software to make, that is, use the menu that comes with the software to stamp the ready-made PDF file. [0004] 2) In the dev...

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Problems solved by technology

[0005] The disadvantages of these two methods are: when the electronic seal is a scanned version of the picture, these two methods cannot meet the situation of using a programming language to generate a PDF file and affix a seal at the same time during the development process.

figure 1 The left side indicates that the PDF source file is stamped by Adobe software, figure 1 On the right is the PDF source file to add a seal by calling the third-party interface. At this time, if the PDF generated during the programming process is produced by Adobe software, there will be an additional manual task. If it is called by the interface of the third-party seal product, a corresponding cost, so it loses its due role in generating PDF and adding electronic seals instantly

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