Sometimes you've got legitimate reason to crack a password protected PDF document. For example, you may legally have a right to open the encrypted or password-protected PDF document but had forgotten the password.
There are two types of PDF protection: the first prevents opening or viewing the PDF document, and the other restricts others from editing, printing or using copy-paste.
When it comes to the copying and printing restrictions:
A simple workaround is to open the document and capture the PDF page as an image using any free screen capture software. For multiple pages you may try SnagIt which has auto-scroll capabilities to for capturing the entire document automatically.
You can also purchase solutions such as Advanced PDF Password Recovery or PDF Password Remover. These will remove the restriction but will not recover the original password.
When there are document viewing restrictions:
There are applications, such as Advanced PDF Password Recovery Professionsl, that will use decryption methods such as dictionary attacks or brute force. They will try all character combinations to recover the password. This may take hours or even days, depending on the password length and your computer's speed.
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