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Fastest, tested, mostly free password recovery software with benchmarks and review
Other Office → PDF password recovery → Guaranteed PDF Decrypter modified: [2011-10-18]
Parallel Password Recovery
Guaranteed PDF Decrypter (GuaPDF) ver. 3.2
Size: 600K
WinXP-2003; Vista/7; Unix,Linux; Mac
++++ (4.20 / 105 votes)
(16772 downloads)
Release date: [2011-10-16]

by PSW-soft

Benchmarks, passwords/sec

Pentium 4 rate: 12 days (40 bit key) / instantly (removing restrictions)
Core 2 Duo rate: 3* days (40 bit key) / instantly (removing restrictions)
AMD rate : 9 days (40 bit key) / instantly (removing restrictions)
CUDA rate : 1 day
Optimized for Pentium II/III; Pentium 4; Core 2; AMD; Dual; NVIDIA GPU; ATI GPU
 * - on 2 cores
Recommended
fastest
download

buy!
Description:
This is a GUI utility which allows you to instantly remove various operation restrictions on PDF files, such as printing and editing (even with 256-bit key, Acrobat 7.x-10.x AES encryption and compressed files supported). It also can decrypt PDF files with password for opening (40 bit key only), no matter what the length of the password or the language is used. The decryption is guaranteed and takes about 1 day on modern computer. Dual/dual-core/distributed computing and GPU acceleration is also supported.
Attacks:  guaranteed decryption; distributed

Price:  $ 25
    What's new in the latest version:

    Acrobat X encryption support, OpenCL GPU acceleration for both NVIDIA and AMD cards.
Russian Password Crackers review:
First product with GPU acceleration of PDF 40-bit key searching

Users' comments:

User Biddley wrote about ver. 2.3 2007-04-10

The "FREE" version doesn't do anything - just blank pages
My rating:1

User Ice wrote about ver. 2.3 2007-04-04

Very fast and reliable. You don\'t have to worry if you loose your password anymore. I have used it on very small up to big files including over 1000 pages.

User mama wrote about ver. 2.3 2007-04-02

Perfect!
My rating:5

User RD wrote about ver. 2.3 2007-03-23

I have been using it for almost six years. Would never consider using anything else.

R
My rating:5

User Vishal wrote about ver. 2.3 2007-03-22

amazing one...... helped me a lot.... thanx a zillion....
and does it sooo smoothly ...... no hassles.... great !!!
My rating:5

User kpcwa19@gmail.com wrote about ver. 2.3 2007-03-16

smashing
My rating:1

User Way2Cool wrote about ver. 2.3 2007-02-24

Oh my lord! What a great little tool, very small footprint, extremely easy to use, fast and effective. I've see companies paying $100's for similar passware.

Way to go Pavel S. and Sergey L; you guys rock!!

My rating:5

User Margareth Lee wrote about ver. 2.3 2007-02-02

Simply the best! An affordable solution. I am grateful.
My rating:5

User Josh wrote about ver. 2.3 2007-01-28

Does just what it's supposed to do. I work at a print shop & often clients submit documents as PDF that need to be modified in some way before they can be printed. When the restrictions in place prevent me from being able to do that, half of the time I find that the client doesn't himself know the password, and the other half it's the middle of the night & too late to call them. With this product, I'm able to remove the restrictions myself so that I can reshuffle pages or whatever else is required. Thanks!
My rating:5

User Reviewer and now License holder wrote about ver. 2.3 2007-01-05

Demo did not work well due to 600Kb file size of PDF.
However, the licensed version actually works as advertised.
Endusers need to remember that decryption only works on the built in security of Adobe PDF, NOT possible external security add-ons.
A solid shareware application with the most options.
My rating:5

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