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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 Harvey Lewis wrote about ver. 3.1 2011-01-05

Got the $25 version. I need to remove restrictions. It tells me the file is not encrypted, which I already knew, but does not remove the restriction - at least not in the 4 times I tried.
My rating:1

User Mitjulia wrote about ver. 3.1 2010-12-25

After purchasing it, they only gave a link to download the program for PCs but didn't ask you if you are using MAC OR PC, What da hell????

I'm using a MAC, why would I want the PC version??

My rating:1

User CG wrote about ver. 3.1 2010-11-23

I have used this software for many years, updating it for new versions of Acrobat. I have tried several and this is the best one around. It allows me to extract pictures from or edit text in 99% of the PDFs I need to.
My rating:5

User Serkan Özkan wrote about ver. 3.1 2010-10-18

The best decrypter that I have met. I didn't meet any crypted PDf file that this program couldn't solve. It worths every penny for it!
My rating:5

User James wrote about ver. 3.1 2010-10-02

I have been using this program since 2006 and can honestly say that it runs flawlessly. I have not come across a PDF file that this program couldn\'t decrypt. On top of that the customer service is the best I\'ve seen in a long time. I ask a question and have an answer almost immediately. All I can do is recommend this as a power user and suggest you get it too.

User adol77@gmail.com wrote about ver. 3.1 2010-08-26

How do I do to run the downloaded demo guapdf from command line (Mac OsX SnowLeopard)?
After moving into decompressed guapdf dir and running the guapdf bash says it is not a known command... even not ./guapdf. Can you help?

User Ben wrote about ver. 3.1 2010-05-02

Great product! Keep up the great work!
My rating:5

User Dan wrote about ver. 3.1 2009-11-14

What a joke and a fraud free demo. I tried opening a 29 thousand K document and the free demo said it made it through 51% then I tried cracking a 650K document (nearly 45 times smaller document) and the free version said it couldn't do the whole thing and could only do 53%. You do the math. THIS IS A SCAM! If you want to gain respect and trust that your product can actually crack a pdf, perhaps you should allow users to actually see that it can do so. I wont purchase unless you can prove it works. I have tried at least 10 crackers that ALL claim to be GUARANTEED and not a single one of them worked on my document
My rating:1

Author P. Semjanov wrote about ver. 3.1 2009-10-31

Ber, I didn't get your e-mail. Please try again.

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...

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