For those who've been asking for it, maxthebest has finally released the source code for ProtectMe. Some notes from the developer:

I've decided to give up Protectme's develeopement a while ago, and I didn't feel good about having the source code totally unused on my computer while some people were asking me for it.
So, here it is, releazsed under GPL Licence, which I hope you will respect.
Use it well, and don't judge me on a work I made while I was very new to PSP and C developement. The code is a mess, I'm sorry...