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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
++++ (4.19 / 104 votes)
(16704 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 Andrew wrote about ver. 3.2 2014-07-05

Great software. It is simple to use and has worked everytime.
I used the demo version to test it and then bought the full version.
My rating:4

User AMJ wrote about ver. 3.2 2014-05-23

I love this program! I just bought the full version

User cress.bligg@googlemail.com wrote about ver. 3.2 2014-04-09

would be useful to get the lost password returned too

User lynn8617 wrote about ver. 3.2 2014-03-21

Love this program, so much that I bought it. Thanks for coming up with this.
My rating:5

User BrianW wrote about ver. 3.2 2013-10-06

Excellent! Very fast command line interface and easy to use GUI.Really useful tool.
My rating:5

User chaitanya wrote about ver. 3.2 2013-10-03

it helped me alot thank u veryyyyy muchhhhh......its awesome

My rating:5

User mds wrote about ver. 3.2 2013-08-23

Despite my initial misgivings about buying decryption software, it worked beautifully. I have a 100+ page report with printing and editing password protected using 128-bit security. The password was removed in seconds. Highly recommended.
My rating:5

User Billyray wrote about ver. 3.2 2013-06-19

Very good program. I had the user key, but couldn\'t remove restrictions due to lost password. Thanks!

User Ahn wrote about ver. 3.2 2013-04-30

Good Good
Very Good
It's so useful!~!
My rating:5

User Robert wrote about ver. 3.2 2013-04-12

Didn\'t work on my PDF file. Got the error message \"Not a PDF file. Startxref not found.\" but it *is* a PDF file, it opens in Viewer. :P :P :P

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