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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]
Password recovery tools
Guaranteed PDF Decrypter (GuaPDF) ver. 3.2
Size: 600K
WinXP-2003; Vista/7; Unix,Linux; Mac
++++ (4.18 / 107 votes)
(16834 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 ciberman wrote about ver. 3.2 2012-07-14

Just purchased to help fix the metadata on pdf E-Books. So far it has removed the restrictions on all the pdf files I have tried it on.
It does exactly what I want it to do. Thanks & Keep Up the good work.
My rating:5

User Patriotgamez wrote about ver. 3.2 2012-06-08

I never give feedback if an application just does its job but this decrypter is awesome and work EVERYTIME!
My rating:5

User New User wrote about ver. 3.2 2012-03-09

Corrupts the File -> Properties -> Description data.
Try it with the encrypted.pdf that comes in the demo!

User Daryl wrote about ver. 3.2 2012-02-14

As a reseller, I need to unlock my providers' applications and pre-fill forms before sending them to my clients for their signatures. Sometimes, I like to even highlight the signature lines and locations where their initials are needed so that the client does not miss one signature. This program has worked like a charm. Exceptionally quick on a Windows 7, 64-bit system -- maybe 2-3 seconds and the restrictions are gone. Voila! Done. Simple. Quick. A focused tool that does what I need with nary a glitch!
My rating:5

User Philip wrote about ver. 3.2 2012-02-14

Top quality software, highly recommended. I use it to remove permissions from secured files so that I can print and extract sections of PDF's in my reports.

User Andy J wrote about ver. 3.2 2011-10-24

Good simple to use... The 3.2 Demo didn't work as well as the full version.

Demo had garbled bookmarks and 1 page only to test program.
My rating:4

User Ratty wrote about ver. 3.2 2011-10-19

Removed printing restrictions in less than 5 secs. V happy :)
Now i don't have to have a laptop to read my notes...
My rating:5

User Mike wrote about ver. 3.1 2011-09-14

Very simple, straightforward, and reliable program. Works every time.

User wrote about ver. 3.1 2011-08-06

Outstanding support. I had a problem removing restrictions which was fixed within 15 min after my first email. I bought my first version of GuaPDF in 2002 and it has helped me many times for removing restrictions (for copying text from PDFs).

User Joey wrote about ver. 3.1 2011-05-11

Removing restrictions: works.
Decrypting: Doesn\'t work (normal 128 bit AES encryption (Adobe Reader 7 and above)), therefore useless for this purpose

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