Description: This video is an introduction to the science behind password cracking. If your curious about what it's all about, then this video is for you!
500 Worst Passwords of all time:
http://www.whatsmypass.com/the-top-500-worst-passwords-of-all-time
Appnimi PDF Unlocker:
http://www.appnimi.com/file/pdf-unlocker
Password complexity cracking stats:
http://www.lockdown.co.uk/?pg=combi
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Most PDF password cracker tools fall in to one or more of three major categories: tools that recover the PDF user password, tools that recover the PDF owner password, and tools that remove the PDF owner password allowing full access to the PDF file.
good for beginners .
http://pcsupport.about.com/od/toolsofthetrade/tp/pdf-password-remover.htm