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From Free PDF Solutions:
Free PDF Unlocker is your solution for unlocking password protected pdf files. Ever forget your password on a pdf file that you absolutely need to get into? Run this free easy to use PDF Unlocker which tries various methods to crack into your document. This program uses the bruteforce and Dictionary method.
Installs TONNES of crapware, took longer to uninstall than install. Plus the actual PDF unlocking program is unbelievably crap, it starts with A through to Z, then does a through to z, then Aa through to Az and so on. It literally tries every single possibility, at about 2 per second. There are billions of possibilities!
installs so much rubbish on your browser, backup software and other junk. affects the registry settings so acrobat pro extended no longer opens. also affects illustrator and other adobe software reg. entries. only way to fix is to roll back to a restore or uninstall all the junk and re-install acrobat cs6
The Kernel for PDF Restriction Removal tool removes all local restrictions from protected PDF files with a single mouse click. Software Compatible with all MS Windows OS platforms. Here is download link http://download.cnet.com/Kernel-for-PDF-Restriction-Removal/3000-2248_4-75871766.html
Still works pretty well, but I've noticed over the last few months that many new files can't be cracked. Looks like it needs an update. Also, go direct to the publisher's website and download it from there, where it's a clean install; getting it from here comes with a bunch of toolbar baloney in the installer.