I need to remove security on a pdf file in order to rpint it . How?

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.

Sometimes we may come across some PDF materials which were download from the internet or sent by others. They are easy to read by free Adobe Reader yet some of them were password protected from opening, copying and printing. It is really tough if you urgently need to copy or print some PDF files. So is there any method to remove PDF password? The answer is yes. But first we need to know some definition about PDF password.

Generally speaking, there are two types of password provided by Acrobat PDF standard security. They are "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 which 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.

So it turns to know how to remove password from PDF. Here is a small and easy-to-use PDF password remover which can help us do this work. Of course first you need to download this PDF password remover and install it on your PC. Then we can get start.

Step 1 Launch PDF Password Remover Double click the start icon to launch PDF password Remover.

Step2 Import PDF files
Click Add and browse the local PDF files need to be decrypted. It allows you to import 200 files at one time. After the files are imported, the file information will be shown in the panel.



Here you need to note that this PDF Password Remover can remove "owner password" directly. While for the PDF files with "owner password", you cannot remove the password unless you know the password. The "owner password" protected PDF files is shown in the pane with a lock beside. If you need to remove the "owner password", just click on the lock beside the file in the pane and key in the correct password in the pop-out small window box and click OK to confirm the password.



Step 3 Decrypt PDF filesClick the Start button, and soon you can get the decrypted PDF files.

Also there is a quicker way to remove PDF password with this PDF Password Remover, just right-click the protected PDF file and choose Decrypt with AnyBizSoft PDF Password Remover in the shortcut menu, you can remove the password from protected PDF file without launching the program!

Sincerely hope this tip can do you much favor to learn how to remove password from PDF.

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