CNET Editors' review
The software world is full of PDF utilities from the four corners of the globe. PSW-soft's Guaranteed PDF Decrypter (GuaPDF) is an example; its developers' page is called Russian Password Crackers, which sounds like something out of the Cold War but in fact is a group specializing in cryptosecurity. GuaPDF is designed to remove various restrictions from PDF files, up to 256-bit key encryption, and to decrypt 40-bit key passwords of any length in any language. It can also harness the processing power of Nvidia CUDA-capable graphics cards to accelerate decryption.
GuaPDF downloads as a ZIP file but opens immediately and runs locally on your PC; there's no need to install anything. This compact program doesn't modify the files it handles in any way, which is part of the decryption guarantee. Right-clicking its System Tray icon accesses the program and an option to choose the decryption's priority in accessing system resources. The interface itself is about as basic as it gets, just a PDF-based interactive dialog with File, Options, and Help menus, progress bars for the key space and the current key, and a main display. We tried several PDFs; GuaPDF quickly identified all characteristics, but the free demo version wouldn't fully decrypt the larger files. Smaller files decrypted instantly, though.
You don't need to be an industrial spy to require PDF decryption; all you need to be is forgetful. We tested GuaPDF in both Windows 7 and Vista with excellent results. It's available in several licensing configurations for regular and commercial users.
Publisher's Description
From PSW-soft:
This is a GUI utility which allows you to instantly remove various operation restrictions on PDF files, such as printing and editing (even with 128 or 256 bit key, Acrobat 8.x-10.x AES encryption and compressed files supported). It also can decrypt PDF files with password for opening (40 bit key only). Supports dual/quad-core computers and distributed processing as well as GPU acceleration on NVIDIA and ATI/AMD card using OpenCL technology.
What's new in this version: Version 3.2 includes OpenCL support for NVIDIA and AMD GPU cards.
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All versions:
1.5 starsout of 4 votes
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Current version:
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Results 1-4 of 4
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"Not up to expectations"
Version: Guaranteed PDF Decrypter (GuaPDF) 3.11
Pros
Did not work for me.
Cons
I'm kinda agree with divedogg review. But, i wouldn't say that the software is an epic fail itself. It did work for me when i tried to use it on a file with low encryption but when i tried it on a pdf file with 128 bit AES encryption, it gave me a error that "128 bit encryption is not supported."
Summary
If you're looking for a pdf decrypter that supports pdf files with 128bit encryption then this software wouldn't serve the purpose for you. Instead of this i do recommend an another software by some estelar group that i tried myself and pretty much satisfied with the results. Here is the link in case if you want to try
http://www.pdfsecurityremoval.com
www.pdfsecurityremoval.com
Updated on Oct 19, 2011 -
"Did not work for the file I tried"
Version: Guaranteed PDF Decrypter (GuaPDF) 3
Pros
Did not work for the file I tried
Cons
I tried several of these protection remover programs on a pdf file. Apparently the file is encrypted in a way that these programs cannot handle. This software gave me an error msg saying that the file uses 128 bit encryption which is not supported.
Summary
Did not work for the file I tried
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"Hard to Evaluate"
Version: Guaranteed PDF Decrypter (GuaPDF) 2.3
Cons
Trial version stops at line 118 which may means that it might not even decrypt a page.
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"Don't waste your time"
Version: Guaranteed PDF Decrypter (GuaPDF) 2.2
Cons
trial decrypts 1 page --- poorly.
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