» PDF » How to Edit a Secured PDF Document without User Password 
For the sake of preventing unauthorized person from reusing or misusing the PDF documents, lots of documents all were secured. But, if forgot or lost PDF password, who anyone tell you how to decrypt them? For your convenience, there is a professional PDF password refixer that can help you recover password, so that you can edit encrypted PDF file as quickly as possible.
iSumsoft PDF Password Refixer can instantly find encrypted PDF file password, then you can edit encrypted PDF file ultimately. Here are steps you needed:
Step 1: Download and install PDF Password Refixer. Launch the program on your computer.
Step 2: Click on Open button to import the Secured PDF Document in Encrypted File box.
Step 3: Select a attack method under Type of attack. And then choose parameter options, such as Range, Length, Dictionary, etc.
Note: If you can recall part of the password, you can choose the Mask attack. If you have no idea anything about forgotten or lost PDF password, the Brute-force attack is a better choice. To make it more convenient for you, please refer to 3 powerful password attack types and related setup options below:
1. Brute-force: Range and Length
2. Mask: Range, Length and Mask
3. Dictionary: Default dictionary or Created dictionary
Related link: Dictionary and Mask Attack Password Settings
Step 4: Then click on the Start button to start the recovery process.
Step 5: Once your password has been recovered, a window will pop-up with the password showed there. Copy the password and open Secured PDF file directly and edit it without permissions password in Adobe Acrobat.
When you are asked for a ''Permissions Password'', enter it and click OK. Then edit PDF file.
If you are not asked for a ''Permissions Password'', you can edit encrypted PDF file at once.
