Guaranteed PDF Decrypter 3.11

• 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/print it.

• remove 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.
  

• Guarantee of removing restrictions regardless of password and encryption type used
• Newest PDF 1.7 ExtensionLevel 3 (Acrobat 9) files support, including AES encryption, Unicode passwords, compressed files and unencrypted metadata
• Removal of some restrictions in signed or certified files by digital signatures and in PDF forms
• Very high speed (40-bit key searching procedure is optimized for Pentium II/III, Pentium 4, Core 2 and AMD architecture, as well as NVIDIA GPU cards)
• Versions for dual/dual-core/quad-core/multi-GPU processors and network distributed version to use power of distributed clients
• Portability (DOS, Windows, Linux, Solaris, Mac OS versions are available)
• Running in GUI and keeps running in batch mode (as command-line utility)

• GuaPDF is the first PDF password removal software ever!
• Unlike most PDF password crackers, your PDF file is not altered in any way (except the decryption), even the file size is often the same. That minimizes the possible incompatibility of the unlocked PDF file.
• GuaPDF is the first and unique software with GPU acceleration of user password removal.
• GuaPDF has special support of PDF forms.

Used crypto algorithms were being improved with PDF developing - up to PDF version 1.4 only 40-bit keys have been used, then the 128-bit ones came, and starting from version 1.6, AES encryption is being added. In Acrobat 9, 256-bit AES keys were introduced.
However, PDF security system is implemented so that a file with restrictions may be decrypted instantly, irrespective of the password length, even for 256-bit keys. A document with password for opening, using 40-bit key, can be decrypted on a modern computer in less than a day by using guaranteed decryption. To open a document with 128 or 256-bit key, only PDF brute force software can be used.

• DEMO (freeware) version. It demonstrates processing of both security methods but has some limitations and can correctly decrypt only small files. It also doesn't contain distributed computing mechanism.
• Local Quad version (former restriction remover). This version process both security methods (i.e. open and permissions passwords), have support for up to four processors/cores and one GPU card. (from $/€25)
• Distributed (20-clients) version. This version process both security methods (i.e. open and permissions passwords), have support for up to 20 CPU/GPU clients in local network for fast 40-bit key searching. It also can be used on local computer with several GPUs (from $/€39)

• UNLIMITED, most powerful version. It does everything, has no limitations. ($/€150)

	Normal version (for CPU)	Version with NVIDIA CUDA support
Win32, Win64	GuaPDF v. 3.11 Free Demo for Windows, GUI version, CPU client (300K)	GuaPDF v. 3.11 Free Demo for Win32, GUI version, GPU client (400K)
	GuaPDF v. 3.1 Free Demo for Windows, command-line version, CPU+GPU clients (250K)
	If you got error message like "The application has failed to start because the application configuration is incorrect" you should install Microsoft Visual C++ 2005 Redistributable Package
Linux	GuaPDF v. 3.1 Free Demo for Linux, CPU+GPU clients (ELF, 1.5M)
Mac OS X	GuaPDF v. 3.1 Free Demo for Mac OS 10.5.x-10.6.x (Leopard and Snow Leopard, Intel only!, command-line + applescript, CPU + GPU clients, 1500K)
Solaris	GuaPDF v. 3.0 BETA DEMO for Solaris 10 x86 (1M)   GuaPDF v. 2.2 BETA DEMO for Solaris/SunOS (ELF, static, 150K)

Please test your file before purchasing using DEMO version

• Q. I got the error message when starting GuaPDF: "The application has failed to start because the application configuration is incorrect."

  A. Try to install Microsoft Visual C++ 2005 Redistributable Package

• Q: How to use my GPU card?

  A: GPU acceleration is used only if your file has password to open with 40-bit key. Also, you need modern NVIDIA video card (from 8xxx series) and the latest CUDA-capable drivers.
  Under Mac OS 10.6 (Snow Leopard) you may need to boot in 32-bit mode.

• Q: What version should I choose?

  A: If can open PDF file, but can not print, edit etc, get the Local (former restriction remover) version. If you can't even open file, first of all you need to test your file (using DEMO version) if it has 40-bit key encryption. If yes, you may choose any version depending of number of computers you've got.

• Q: I've tested GuaPDF DEMO on my file, but got only blank pages (or some errors)

  A: DEMO version can process small files only. In fact, unlike other PDF decrypion software, GuaPDF don't change anything in your file structure, it only decrypts all encrypted streams and strings. That's why the decryption is guaranteed: your file is not modified (even the file size is often the same after decryption). DEMO version has only one possible limitation: it decrypts only few streams, all others streams remain encrypted. So, if the large files contains more streams than DEMO limitation, the decryption may cause any errors and blanks (non-decrypted) pages.

• Q: Ok, but how can I sure the full version will work on my file?

  A: If DEMO version parses your file with no errors and the key is printed, the full version will work fine, because the decryption with known key is trivial.

• Q: Ok, how long will it take?

  A: Restriction removal is instant (may be few minutes on very large files). To estimate key searching time, run DEMO version (and divide it to the number of your PCs).

• Q: Are non-standard security handlers supported?

  A: No, please run DEMO to make sure your file is supported.