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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)
(16703 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 Adrian (Australia) wrote about ver. 3.0 2009-04-19

I've been using GuaPDF since 2004. I find it to be an essential tool for when I'm researching a particular topic and I need to extract a paragraph of two out of a pdf document that normally wouldn't allow this. A great program that I wouldn't be without.

User Jeremy B wrote about ver. 3.0 2009-04-15

I've been using GuaPDF for 8 years, and in that time it has never failed. Restrictions removal is basically instantaneous and brute force cracking is very, very fast. Every time the program has created a perfect, unrestricted copy of the original PDF.

Having the ability to edit/modify PDF files directly is far more efficient than the tedious alternatives of printing & handwriting or text/image extraction. In fact I am using GuaPDF today to edit documents for a business transaction.

If you use or work with PDF files with any frequency, GuaPDF is an essential tool. Also take the time to read about what it can and can't do, since there is some misleading information in these reviews. The homepage specifically states that third-party encryption schemes (such as ebooks) are NOT supported.

Hands-down one of the BEST programs I've ever purchased. 5/5
My rating:5

User Harry Scholberg wrote about ver. 3.0 2009-04-09

Seems to be doing exactly what is specified and damned fast at that!

congratulations! Dr Harry P F Scholberg
My rating:5

User claude wrote about ver. 3.0 2009-03-20

La version payante fonctionne parfaitement bien. Du bel ouvrage. Merci. Claude
My rating:5

User Raag Rolfsen wrote about ver. 3.0 2009-01-19

Tried it to decrypt a pdf ebook that I have rightfully bought, but which has entered en encrypted mode so that I can't open it it. The program failed!
My rating:1

User Dave in California, USA wrote about ver. 3.0 2008-11-22

The program worked as advertised, both the trial and the purchase version. I had no problems installing and using the program. Great program! I recommend it highly.
My rating:5

User john parker wrote about ver. 3.0 2008-11-21

Trial version is WORTHLESS!

It did nothing.

FAQ said "the full version will work fine". Why should I buy the full version when the trial version offers NO proof the program will work?

User Tony - Spain wrote about ver. 3.0 2008-10-09

I've tried demo version but it didn't remove editing password (as told in specs). It told me every time that document were not encrypted and didn't do anything else.
My rating:1

User fc_uk wrote about ver. 2.3 2008-07-19

Tool delivers as promised. Only one that does in a reasonable amount of time due to support for multiple cores/distributed computing. Used software for both brute force password cracking and permission removal. Clearly worth the money!
My rating:5

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

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