Usually, we download PDF files from internet or receive them in the email. The PDF files may contain much information we need. We want to open them in Adobe Acrobat and edit them or copy some text, images out of the PDF files. For some PDF files we cannot edit, copy or even print it, because they are encrypted. If you want to view or copy those PDF files, you need the password of the files.

Basic knowledge about the PDF password
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 the PDF file, people will have to enter the user password to open it. So only the ones who know the user password can open the PDF file.
Owner password is set for changing the rights of the PDF file. With an owner password, the owner can protect the PDF files from printing, copying text and graphics out of the document, modifying document and adding or modifying text notes.

Then, find out how to remove the PDF password.
The universal recovery methods like Brute Force Attack are too slow because of the encryption method used in PDF files.

Want to get back the password? Why not to 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.

 

Software Name	System Requirements	Price	Trail Version Limitation
PDF Password Cracker Pro	Windows	$49.95	only decrypt the first half pages of your original PDF file.
Guaranteed PDF Decrypter	Windows, Linux, Solaris/SunOS	$25-$150	Demo version has some limitations and can correctly decrypt only small files.
A-PDF Restrictions Remover	Windows	$9.99	Free 15 days full function trial.
PDF Password Recovery	Windows	$19.99	The demo version will add the watermark "Demoversion" to every page of the result file.

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

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