Guaranteed PDF Decrypter can be used to instantly remove restrictions on any PDF document. Any Acrobat version up to 9 is supported, even with 256-bit AES or 128-bit RC4 encryption. GuaPDF can be also used forremoving the PDF open 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 several days on one home computer.
Version 3.11: Release notes were unavailable when this listing was updated.