php editor Apple teaches you two methods to disable viewing PDF files and protect file security! First, you can use the password protection function and enter the password when opening the PDF file to view it. Secondly, you can use PDF editing software to convert the file into an image format, so that the text content cannot be copied directly even if it is opened. These two methods can effectively protect PDF files from unauthorized viewing.
Method 1: Modify the file suffix through decompression software to hide the real file
We can use decompression software, such as WinRAR, to modify the PDF file into a file with other suffixes. After modification, the PDF file cannot be opened directly.
Steps:
1. Select the PDF file, then right-click the mouse and select WinRAR’s [Add to compressed file] option;
2. After the [Compressed File Name and Parameters] dialog box pops up, in the [Compressed File Name] column, change the compression format suffix of the file to other file suffixes, such as "doc", "xls", etc., and then click Click [OK] below.
3. The compressed PDF file will be displayed in other file formats, such as the Word document in the picture below, which hides the true format of the file. Although the icon has changed, it is essentially a compressed file, so you cannot open the file by double-clicking it directly.
4. Double-click to open the file, and a dialog box will pop up prompting an error that cannot be opened. In this way, you can prevent others from opening your PDF files at will.
If you want to open a PDF file, you only need to select "Open with" WinRAR or other decompression software to open it.
Method 2: Set PDF “open password”
We can also set an "open password" for the PDF file, so that the PDF file can be opened only by entering the correct password.
To set the "open password" for PDF files, you can use a PDF editor or PDF-related tools.
If you use a PDF editor, after opening the PDF file through the PDF editor, first find [Password Encryption] in the [Protection] list on the menu tab;
After the dialog box pops up, enter the password you want to set twice in the password field, and then click [OK]. The "Open Password" of the PDF file will be set.
You can also use PDF-related tools, such as PepsiNiu PDF Password Recovery Tool. The [Add Open Password] module in the tool can set an "open password" for PDF files.
After selecting the [Add Open Password] module, import the PDF file that requires setting a password, and then you can set it.
It should be noted that if you set an "open password" for the PDF, remember to remember or save the password, otherwise you will not be able to open the PDF file.
What if I accidentally forget it? In this case, we can still use the PDF tool mentioned earlier to solve the problem.
The [Retrieve Password] module in the tool can help us retrieve the forgotten PDF "open password".
After selecting the [Retrieve Password] module, you can see that there are 4 retrieval methods provided. After importing the PDF file into the tool, select the appropriate method and follow the prompts.
The above is the detailed content of How to disable viewing of PDF files? Try these two methods!. For more information, please follow other related articles on the PHP Chinese website!

Ditch the Calculator: Why and How to Use Excel for All Your Calculations I haven't touched a calculator in ages. Why? Because Microsoft Excel handles all my calculations with ease, and it can do the same for you. Why Excel Trumps a Calculator While

Creating tables in Word, although improved, is still cumbersome and sometimes brings more problems. This is why you should always create tables in Microsoft Excel. Why is it better to create tables in Excel? In short, Word is a word processor, while Excel is a data processor. So Word is not built for the best table creation, but its similar product, Excel. Here are just some of the reasons why creating tables in Excel is better than using Microsoft Word: Although it is surprising that you can use many Excel-like features in Microsoft Word tables, in Excel you

Enhance Your Excel Charts: Reducing Gaps Between Bars and Columns Presenting data visually in charts significantly improves spreadsheet readability. Excel excels at chart creation, but its extensive menus can obscure simple yet powerful features, suc

Quick View of AVERAGEIF and AVERAGEIFS Functions in Excel Excel's AVERAGEIF and AVERAGEIFS functions can be used to calculate the average value of a dataset. However, unlike simpler AVERAGE functions, they are able to include or exclude specific values in the calculation. How to use the AVERAGEIF function in Excel Excel's AVERAGEIF function allows you to calculate the average value of a filtered dataset based on a single condition set. AVERAGEIF function syntax The AVERAGEIF function contains three parameters: =AVERAGEIF(x,y,z)

Excel web version features enhancements to improve efficiency! While Excel desktop version is more powerful, the web version has also been significantly improved over the past year. This article will focus on five key improvements: Easily insert rows and columns: In Excel web, just hover over the row or column header and click the " " sign that appears to insert a new row or column. There is no need to use the confusing right-click menu "insert" function anymore. This method is faster, and newly inserted rows or columns inherit the format of adjacent cells. Export as CSV files: Excel now supports exporting worksheets as CSV files for easy data transfer and compatibility with other software. Click "File" > "Export"

Master Microsoft Excel with these essential keyboard shortcuts! This cheat sheet provides quick access to the most frequently used commands, saving you valuable time and effort. It covers essential key combinations, Paste Special functions, workboo

Excel's LAMBDA Functions: An easy guide to creating custom functions Before Excel introduced the LAMBDA function, creating a custom function requires VBA or macro. Now, with LAMBDA, you can easily implement it using the familiar Excel syntax. This guide will guide you step by step how to use the LAMBDA function. It is recommended that you read the parts of this guide in order, first understand the grammar and simple examples, and then learn practical applications. The LAMBDA function is available for Microsoft 365 (Windows and Mac), Excel 2024 (Windows and Mac), and Excel for the web. E

Quick Links Why Use the Camera Tool?


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

Atom editor mac version download
The most popular open source editor

Dreamweaver Mac version
Visual web development tools

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
