Usually, we download PDF files from the Internet or receive them in emails and much valuable information is contained in the PDF files. We want to open them in Adobe Acrobat and edit them or copy some text, images out of the PDF files. Unfortunately, for some PDF files we cannot edit, copy or even print because they are encrypted. If you want to view or copy those PDF files, get the password firstly, and then, you can edit the PDF files.

http://www.allpdftools.com/pdf-editor.html

Basic knowledge about PDF passwords There are two kinds of password provided by Acrobat PDF standard security. They are “user password” and “owner password”.

User password is for opening PDF file. If you define a user password before generating a PDF file, only entering the password can you open the decrypted PDF file. Owner password is set for limiting the privacy of PDF files. With owner password, owners can protect PDF files not only from adding and modifying text notes but also from printing and copying contents.

Then, find out how to remove PDF passwords. The universal recovery methods like Brute Force Attack are so slow because of the encryption method used in PDF files. For more info, please visit http://en.wikipedia.org/wiki/Brute_force_attack

Want to get back the password? Why not remove them? If you are careful enough, you may find that there are many PDF password remove tools and most of them can be free downloaded.

Below is a list of the PDF password remove tools.

1.PDF Password Cracker Pro, $ 29.95, the trial version can only decrypts the first half pages of the original PDF file. For more info, please visit http://www.crackpdf.com/

2.PDF Password Remover, $9.95, has free 15 days full function trial. For more info, please visit http://www.allpdftools.com/pdf-password-remover.html

3.PDF Password Recovery, $24.95, the demo version will add the watermark "Demoversion" to every page of the result file. For more info, please visit http://www.cadkas.de/downengpdf15.php

4.The password remover above can only run on Windows OS. If you need to remove PDF passwords on Linux, Solaris and SunOS, you may need Guaranteed PDF Decrypter,which charged from $25 to $ 150, and the limitation is that it can only decrypt small files.

For more info, please visit http://www.guapdf.com/

Password removing always causes sensitive problems. So, please make sure that you have not violated the law in using these password removing methods.