guapdf 3

Remove restrictions (unlock) of 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.