This is an utility to bypass the security on PDF documents (of course, you should have the right to do it, for example, in case of forgotten user/owner password). Only standard PDF security is supported , neither third-party plug-ins nor e-books. Both protection methods are cracked:

restricted operations on file can be disabled (instantly, any Acrobat version up to 7.x, even with 128-bit AES encryption).

password encrypted file can be decrypted (in a several days, Acrobat ver. 3.x, 4.x, 40-bit key);

It also can be used to decrypt files you know password for.

This is GUI utility for Win32 and command-line utility for Linux and Solaris/SunOS.

The standard security provided by PDF consists of two different methods and two different passwords. A PDF document may be protected by password for opening ('user' password) and the document may also specify operations that should be restricted even when the document is decrypted: printing; copying text and graphics out of the document; modifying the document; and adding or modifying text notes and AcroForm fields (using 'owner' password). An examples of restricted and encrypted files you'll find in the GuaPDF distribution archive.

Guaranteed PDF Decryptor Main Features:

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Guarantee of decryption

New PDF 1.6 (Acrobat 7.x) files support, including AES encryption, compressed files and unencrypted metadata

Very high speed (optimized for Pentium II/III, Pentium 4, AMD architecture)

Confidentiality (you crack your secret files, not someone from cracking service)

Version for individual user and network version to use power of distributed clients or dual (dual-core) processors

Portability (DOS, any Windows, Linux and Solaris versions are available)

Running in GUI and keeps running in batch mode (as command-line utility)