Unlock PDF - Knowing the Fact & Tutorial
Do you have encounter with some PDF(Adobe Acrobat) files which can’t be opened, printed, copied, or edited? These PDF Files are encrypted by password security, being added with so many restrictions.
The first question is why people encrypt these PDF files? That is stupid one! Password protecting PDF files ensuring that the content of the PDF could not be available to unless you share the password with them. It is for sure that, the owner doesn’t want to share the PDF file with all people. So, they Use PDF passwords to help to distribute control access, and apply file permissions to restrict printing, copying, or altering.
Then How to add password to a PDF file? Many PDF Creators have this feature; yeah sure, Acrobat would be the best choice. Generally Speaking the following algorithms are used when encrypting a PDF file:
A proprietary encryption algorithm known as RC4. RC4 is a symmetric stream cipher: the same algorithm is used for both encryption and decryption, and the algorithm does not change the length of the data.
PDF’s standard encryption methods also make use of the MD5 message-digest algorithm for key generation purposes.
What are Owner Password and User Password?
Owner password is Permissions Password / Master Password. Set to protect PDF to let you block unauthorized access controlling, such as copying, extracting, or modifying content.
User Password is Open Password. To prevent from opening PDF. You could not open the PDF file if you don’t have the password.
It is very easy for you to remove the Owner Password from secured PDF files. Here I got a free online tool for you. http://www.crackmyPDF.com/
Free tool is a good choice for many people while I have to let you know that there are pros and cons there, and the bad sides are:
Could not unlock the User Password;
Don’t support all kinds of encryptions;
It is not save for you to upload a confidential file;
If you want to unlock the PDF that secured by User Password or if you want to unlock your PDF files in batch then don’t miss my recommendation: PDF Password Remover.PDF Password Remover is a small and easy-to-use PDF cracker to help you decrypt PDF files and remove restrictions on printing, editing and copying.
More Features about PDF Password Remover:
Unlock PDF files protected for copying and printing directly;
Unlock PDF files protected for viewing (with authorized password);
Support batch decrypting 200 PDF files at one time;
Support right-click decryption mode.
Finally, How to unlock PDF Files?
I am going to demonstrate a step by step tutorial to show you how to unlock PDF files with PDF Password remover. To continue with my tutorial below, you have to make sure that you have Download and install PDF Password Remover.
Step 1 Import PDF files
Launch the Program, Click the Add Files button to import PDF files from your divers as you could see as below. If you want to remove a file from the list just select the file then click remove.
Step 2 Choose a folder to save the files
You could just save files in source folder or in another folder. If you want to save in anther folder, just select Customize then click the open button to choose a path.
Step 3 Click Start to trigger the conversion
Pretty easy 123 steps, then you got it!
Well, that is pretty much all the thing about Unlock PDF that I want to share with you. If you have any question about it, please feel free to contact me at nathanpittbro[at]gmail.com
Nathan Pitt
Editor of PDFpie.com