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The standard PDF protection can have two different passwords: a document open password and a permissions password. When a document open password (also known as a user password) is set, anyone who tries to open the PDF must type in the password. When a permissions password (also known as a master or owner password) is set, recipients don't need a password to open the document, but they must type the permissions password to set or change the restricted features. PDF security supports encryption with 40, 128 and 256 bit keys.
* GuaPDF is the remover of PDF restrictions (permissions password). It is instant and guaranteed process.
* GuaPDF is also the remover of PDF open password. It is guaranteed only if it has 40-bit key long, it takes about a day.
* Password recovery of 128 or 256-bit PDF encryption is only possible using PDF brute force software.
The primary goal of GuaPDF is to remove restrictions (a.k.a. remove permissions password) on any secure PDF document (you should have the right to do it, for example, if you forgot the password). Any Acrobat version up to 9 is supported, even with 256-bit AES or 128-bit RC4 encryption. PDF restrictions removal is an instant process. Unlocked file can be opened in any PDF viewer without any restrictions so you may edit, copy or print it.
GuaPDF can be also used for removing the PDF open password (a.k.a. user password). Decryption of the file with password for opening is guaranteed for PDF files with 40-bit key only (Acrobat 3, 4 compatible encryption). This process takes 1-2 days on one modern desktop computer.
Note that only standard PDF security is supported, neither third-party plug-ins nor e-books.