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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)
(16811 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 h_zoellner@yahoo.com wrote about ver. 2.3 2007-01-03

Works great with the standard copy protection one encounters. Well worth its $.
My rating:5

User Rod wrote about ver. 2.3 2006-12-28

Excellent product and excellent support. Highlty recommended.
My rating:5

User info@spe.net wrote about ver. 2.3 2006-12-26

Fantastic program.
I use it since many years and it allows us
to recover many old files where we forgot
the right password.

My rating:5

User Dimitry Andric (NL) wrote about ver. 2.3 2006-12-26

Very nice utility. Does what it has to do, and with the minimum of hassle. Affordable too. :)
My rating:5

User Donnie (United States) wrote about ver. 2.3 2006-12-25

It works very well and has helped me out tremendously. Many thanks!
My rating:5

User Sai wrote about ver. 2.22 2006-10-22

Excellent program. Just what I needed. Many Thanks..please keep upthe good work.

User Derrick wrote about ver. 2.21 2006-09-30

Excellent customer service. Quick response to questions and great support for added features.
My rating:5

User joshcxa wrote about ver. 2.21 2006-09-27

Just what we needed! did the job quite easily. Also thanks for the quick reply when we needed help.

User Doug wrote about ver. 2.21 2006-07-30

I used the demo & it reached its limit on line 139 but the resulting pdf was blank and I got the following Acrobat error when I tired to open it:
"There was an error processing a page. Invalid Function resource."
Before I spend $30 I need confirmation that it will work on my file?
Help Please?

User aptiaa wrote about ver. 2.21 2006-07-18

I still didn't buy it. I tried to open a file and it says:

"This file uses non-standard encryption algorithm in line 16963" Then the program seems to stop working and that's it.

I wonder if it will be able to decrypt this file. I will bouy the program if you tell me it will do it's job.

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