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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]
Password recovery tools
Guaranteed PDF Decrypter (GuaPDF) ver. 3.2
Size: 600K
WinXP-2003; Vista/7; Unix,Linux; Mac
++++ (4.20 / 105 votes)
(16736 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 Ed Martinez wrote about ver. 2.3 2008-06-30

Great tool! It took me less than 5 seconds to break a PDF. The price is worth it.
My rating:5

User Mike wrote about ver. 2.3 2008-06-29

Two years ago I created a 200 page PDF, indexed and searchable, with restrictions set on editing and copying. Recently I wanted to update it but I had forgotten the password. This program created a perfect copy with the restrictions removed in seconds. The best $25 I've spent on software in many years. Thank you.
My rating:5

User RTK wrote about ver. 2.3 2008-06-04

Incredible! Where was this when I was in college?
My rating:5

User Ed Davis, NY, US wrote about ver. 2.3 2008-03-02

Awwweesssssommmee!!!!!!!!!

User jh wrote about ver. 2.3 2008-01-21

Removed the restrictions on pdf's version 8 in about half a second, brilliant. Highly recommended!
My rating:5

User kratos wrote about ver. 2.3 2007-12-02

A Mac version is available (command-line, Intel) if you ask the author directly. It works great on my quad-Xeon (2.2 GHz) Xserve. Running four clients on as many CPUs, it can clear the keyspace in less than a day. Fantastic.

User Steve wrote about ver. 2.3 2007-10-18

Excellent program that does exactly as advertised. After evaluating many different options, this program is clearly the best for the price and quality of application.
My rating:5

User skelly wrote about ver. 2.3 2007-09-08

Worked perfectly de-crypting a 54 page Home Information Pack (HIP) document so that I could edit it without having to go back to my HIP supplier. Saved me money and worked right out of the 'box'.. err.. download! :)
My rating:5

User me wrote about ver. 2.3 2007-09-04

Saved me a lot of time and money to open comany files where noone know the password anymore...
My rating:4

User Theodros wrote about ver. 2.3 2007-08-14

I know it is highly helpful. But I could never imagine how i can buy it here in Africa,Ethiopia. I need your help.Please!!

theodros1984@yahoo.com
My rating:5

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