Hello! I have lost my PDF file password, I wonder how I can get it back

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PDF is really a good thing for reading and sharing as it has great reliability.Almost any one on any computer system can view PDF with PDF Reader.

However,due to the copy-right or data protected,when creating PDF,we may put password to prevent from editing,copying and so on. But sometimes,there may be reasons to unlock or crack PDF password.We do have the legal right to use the password protected PDF document,but have unfortunately forgotten the password.


What is PDF password?

Generally speaking, there are two kinds of password provided by Acrobat PDF standard security. "user password " and "owner password ".

"User password" is also called "open password ", it is the password defined by the people who create the PDF file, and it is used for protecting the PDF files from opening by others. Only people who enter the password can open the protected PDF files.

"Owner password " is the password that set to protect the PDF files from changing by others. With an "owner password", the owner can protect the PDF files from printing, editing or selecting text and graphics.

How to remove PDF securty?

There can be lots of situations where you would want to use a password protected file! So how can you unlock secured PDF files ? In this article I will show you how to unlock secured PDF files to edit,copy or print.

You need a PDF password remover. Or Adobe Acrobat is the best if you want to pay lost of money and lost of time.I strongly recomment this alternative: Advanced PDF Password Remover.



You need to downlod the program launch PDF password remover and then add file to begin.When finished it will show you the files securty password has been removed,then you can edit or copy,print etc.

The process just need a few seconds.If you want to know more details, please visit the official website.

PDF encryptionGenerally, PDF files are with a password called User Password, which is used to open the file and view the document. To encrypt a PDF password does not simply mean you can’t open and view the document, but PDF files have five to seven encryption ways to protect the file for office needs. Owner password, the other password of PDF files, is another crucial PDF password, which is to protect the file from maybe being copied (to Clipboard), printed, or modified, etc. So, in speaking of PDF password, it doesn’t necessary mean the one which you use to open the file.
PDF encryption largely relies on the sophisticated algorithm that hardly to be reversed. For example, you are easy to calculate that 1000 plus 1 is 1001, however, the reverse is seemed impossible, for 1001 can be an answer of countless calculations. PDF encryption works in the similar way. In this sense, given a password, it’s easy to deduce and decipher some data; however, the reverse PDF password recovery seems impossible.
Generally speaking PDF encryption with 128 bits key value is much more secure than that of 32 bits. PDF encryption is accomplished by a key value, either 128 or 32 bits in size. When using the key, all the bytes are changed (unless they are decoded back with the same key) into meaningless codes, and the file is impossible to be opened. Only the meaningless codes are calculated back using the correct value is it possible to get the correct password and open the file. 128 bits has a lot more possible values than the one with 32 bits, so it is much more secure. If your password is forgotten and intend to recover PDF password, PDF Password Unlocker software could be faster, for it supports 128 bits encryption, either 128 bits RC4 or 128 bits AES encryption.

PDF files are composed with objects, like image Objects, graphic Objects, and text Objects, etc. The key is calculated for each PDF Object in the PDF file using local data, which is much hard to crack, as the key keeps changing.
Set and remove PDF passwordsAdd a PDF Password1. Click the Secure button in the Tasks toolbar, and choose Password Encrypt.
2. Click “Yes” to the prompt about changing the security, and if necessary, type the Permissions password that lets you change security settings. If you don’t know the password, contact the author of the PDF.
3. In the Password Security - Settings dialog box, set the security options as desired, confirm the password, click OK, and then click OK again.
4. Save the document to apply the security settings.
Note: You can also restrict editing capabilities when you certify a document, or when you apply a policy to a PDF.
Remove PDF passwords and security settingsYou can remove PDF passwords and security policies from an open PDF if you have the permissions to do so. If the PDF is secured with a security policy that resides on a server, the changes can be made only by the author of the policy or by a server administrator.
1. Do one of the following: Click the Secure button in the Tasks toolbar, and choose Remove Security.
Type your password, and click Yes to the prompt about removing the security.
In the Security tab of the Document Properties dialog box, choose No Security from the Security Method menu.
2. When prompted, specify the Permissions password, and then click OK. Recover PDF password in case you forgot it.Every coin has two sides. Even the PDF document is strongly encrypted with passwords, it is impossible to insure that it is secure. Once you forgot PDF password, the data in the encrypted PDF file are on the risk of unavailability. Unless fortunately the password knocks your memory again, you got the data lost or you have to give up the document eventually. With the ever-growing of strong encryption algorithms, decryption algorithms gradually come into existing, too. Though the cracking is far more difficulty than ever before, it is still of help to those expecting to recover PDF password and access the password protected PDF file. Take PDF Password Unlocker, a popular PDF password recovery software, for example, it has adopted the advanced decryption algorithms to crack 40-bit RC4, 128-bit RC4, 128-bit AES, and 256-bit AES encrypted passwords with 3 attack methods, Dictionary attack, Brute-force attack, and Brute-force with Mask attack
Reference: http://www.passwordunlocker.com/knowledge/pdf-encryption-and-pdf-password-recovery.html

What can you do if you have forgotten password for PDF protected file,it appears"Enter the password".You don't have the password .So how to decrypt password protected PDF Files?

SmartDoctor has released PDF Password Recovery 5.0,software said to recover the passwords of protected PDF documents,even when unusually complicated or long.Successfully unlocked documents are accessible without printing,copying or editing restrictions.

The program supports all character encodings, and can recover passwords entered with any input language or keyboard layout.It is easy to use



1.Click "Open" button of the File Name to browse the full path of the PDF file.

2.On the "Recovery" tab, select "Brute-force Attack (Trying All Possible Combinations)".

3.Click "Start" button in the Menu to initiate the program

4. Some time later, a message box pops up to you, showing the User Password expected. Click "Remove All Passwords from the File" to remove all the restrictions placed on the PDF file. Click "OK".

PDF files have become the defacto document standard on the Internet. Why? Well because it is the Portable Document Format. The file you created will look just like you had prepared it, irrespective of the software used to create or read the file or whether the other person has the fonts you used. It also offers hundreds of other options that make it truly great for the power user.
However sometimes you get a PDF file from a friend/colleague or from the Internet that is password protected. Some require a password to open, others have the fonts, images and other content protected and others prohibit you from printing the file. You can of course contact the person concerned to get the password, but there can be plenty of situations where you would want to use a password protected PDF file otherwise! So, here I tell you a wonderful tool PDF Password Unlocker.
PDF Password Unlocker is the PDF password recovery software that allows you to remove PDF passwords and open protected PDF files. PDF Password Unlocker recovers PDF passwords instantly and removes all the restrictions for copying, printing and other actions. It is powerful enough to recover PDF passwords of any strength with a speed higher than most of the existing programs. It's a premium program that unlocks PDF files created by either Adobe Acrobat PDF or any other PDF applications.
Main Features:

All Adobe PDF versions are supported through the latest 9.0

Support PDF files created by other PDF applications

Recover PDF password for opening the file

Instantly remove restrictions and enables copying, printing and other actions, etc.

Powerful enough to recover passwords of high strength

Support 40-bit RC4, 128-bit RC4, 128-bit AES, 256-bit AES encryptions

Available of brute force, brute force with mask and dictionary attacks

Double in speed when compared to similar programs

Up to 4,000,000 passwords/s for single-cored CPU, and 8,000,000 passwords/s for multiple-cored CPU computers.

Able to minimize the recovering time by customizing a password character set if any part of the password is known

Able to create your own dictionary for the program to base on

Automatically save the recovery process and resume if accidentally stopped

Work on both single-cored CPU and multiple-cored CPU computers

Simple utility and easy to use
PDF Password Unlocker is the simpliest PDF password remover for encrypted Adobe Acrobat PDF documents. It is the ever easiest-to-use PDF password recovery tool to recover and remove both the "User Password" and "Owner Password" efficiently and safely, making it possible for you not only to open but to modify the PDF document. Thereafter, instead of locked out of the document, you can open it and perform all the operations as you like, such as select text and graphics, change or add annotations, copy to Clipboard, modify the content, and print the document, etc. Functions as an Adobe Acrobat PDF cracker, it is super easy to use! Just give the full path of your PDF to the program and with a mouse click to the "Start" button on the program will be OK. There is no related knowledge required, even a kid can manipulate successfully.