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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)
(16777 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 Peter wrote about ver. 3.1 2009-10-28

Just excellent. Demo version was crap. Full version excellent. Why not deliver a limited time full demo version...

User Ber wrote about ver. 3.1 2009-10-23

1. Demo version is useless.
2. Full version is excellent.
3. How to get command line version? I sent 4 emails -- got no reply.

User RB wrote about ver. 3.1 2009-10-19

Works great so far!!!

User jamie wrote about ver. 3.1 2009-09-25

Only one key because of the absurdly slow method of delivery via ShareIt. 'Your software well be delivered between 4 and 24 hours' is not acceptable for a product download.
My rating:1

User Ben wrote about ver. 3.1 2009-07-21

Straightforward, runs great
My rating:5

User Blake wrote about ver. 3.0 2009-06-04

Outstanding product. It works like it says it will and the interface is simple and easy to use. Quick and easy and functional.
My rating:5

User Joshua E. wrote about ver. 3.0 2009-05-22

Does what it says and does it well, with no annoying drawbacks that I've ever encountered.
My rating:5

User Frank wrote about ver. 3.0 2009-05-20

Using v 3.02, works great! did not try the demo version. Also tried v 3.0 with no issues. Highly recommended!!
My rating:5

User Don wrote about ver. 3.0 2009-05-17

Version 3.02 link could not be found for upgrading !
Version 3.0 worked !
My rating:1

User wrs wrote about ver. 3.0 2009-05-03

I agree the demo is dubious, but the full version is great. Very cleanly implemented and reliable. I appreciate CLI version. Thank you Pavel!
My rating:5

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