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PDF 工具Unlock a Secured PDF Document in Three Steps
unlock pdf There are two types of passwords attached to PDF files. The first type is going to prevent you from opening and viewing the file all together. The second type is going to prevent you from doing anything other than opening the file. This is the permissions password. You will not be able to modify, copy, or print the PDF file without this password. Fortunately, there are easy techniques and programs, like PDF Unlocker to unlock a secured PDF file from password restrictions. Download free trial version of our PDF Unlocker tool and follow the steps below to unlock a secured PDF document with ease: Unlock PDF from Owner/Permission Password Restrictions (Print, Edit, Copy, etc.) Remove Open or User Password from PDF to Access the PDF File Part 1: Unlock a PDF File from Owner Password Restrictions You need to follow these 4 steps to remove owner/permission password from your PDF file and print, edit, copy the content freely.Step 1: Install and launch the program First of all you need to download and install the PDF Unlocke on your computer.
Step 2: Select "Remove Restrictions" mode Now, launch it on your computer and select the "Remove Restrictions" mode.
Step 3: Import secured PDF files Now you will need to click the"Select a File" option to import secured PDF files. Additionaly, you can also drag and drop PDF file into this program.
Step 4: Select the destination path and click the "Convert" button In the end, you need to choose the destination path for output file and click the "Remove" button to unlock your secured PDF from all the password restrictions.Part 2: How to Remove User or Open Password from the PDF File If you don't know the open/user password of the protected PDF file and as a result you can't even open your PDF file, you can use this PDF unlocker to remove the
open password permanently from encrypted PDF file. You need to follow these steps:Step 1: Download and install the program on your computer First of all you need to download and install the PDF Password Remover on your computer.Step 2: Launch the program on your PC and select "Recover Passwords" Now, run the program on your computer and select "Recover Passwords" option. After that import the locked PDF file by clicking the "Select a File" button
Step 3: Select the "Recovery Method" to crack the open password Now, you need to select the appropriate recovery method to crack the password of the protected PDF file. Here the 4-recovery method, you can use to help the software guess the password of the protected PDF file:1. Dictionary Attack: If you have no clue about the password that is used to protect the PDF file, then you should start with the "Dictionary Attack" mode. This mode utilizes a default dictionary which contains a large number of common passwords. It often cracks the common passwords since most common passwords are covered by the available lists, created by various password generation techniques.2. Combination Attack: If you remember some parts of the password, then you should go with the "Combination Attack" method. Suppose you know that the password Includes someone name like "Mark" and the number "1989" but don't remember the exact way they were used in the password, the you can choose this method and provide the information like this: Uppercase Letters: M
Lowercase Letters: a, r, k
Numbers: 1, 9, 8
You can increase the chances of password recovery even more by providing more information like the length of the password, symbols, prefixes & suffixes, etc.3. Dictionary Attack: If you are only certain about the few parameters of the password, then you should go with the "Dictionary Attack." For instance, you know that you usually create a password between 9 to 10 characters without any numerical digits, but always add you birth month "November" in the password, then you should go like this: Password Length: 9-10 characters
Characters not included: numbers
Characters or combinations of characters may be included: November4. Brute Force Attack: If you have no idea about the password that is set on the PDF file, then you should select the "Brute-Force Attack" method. This method will apply all the possible password combinations to crack the password. This method may take a long time depending upon the complexity of the password.
Watch Video Tutorial on How to Unlock a Secured PDF File This video tutorial explains how to unlock a password protected PDF file with our program called PDF Unlocker: https://stackoverflow.com/questions/62977423/unable-to-perform-ocr-for-pdf-files-having-content-copying-set-to-not-allowed