I have a whole library of Ebooks but I assumed releasing them would be not so legal considering regularly you'd have to pay for them.
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Cryptography, Hardware hacking, one book on Micro coding, ASM, C, C++, D3D, Network hacking, Some books on rootkits AKA subverting the kernel etc., WinAPI, reverse engineering, IP coding, probably no web programming books I figured web programming was a waste of time BS a while ago.
Probably no straight guide to MMO hacking you'll probably need to know a little of all the stuff I mentioned.
I just carry all of the Ebook pdf's and chm's on my Flash drive.
Never actually thought of releasing it, but when I get my account back I'll look for someone to approve.