Late 90s and early 2000s were the best days for Reverse Engineering. +Fravia, Woodmann's forum and SoftIce flickers in the back of my memory...

And yes, many of the old-school (and entry level) tuts were from the DOS era. ORC's?

The protection scheme where they used a laser to burn a small hole in a specific sector of the disk is just mind boggling to me. How'd they figure out where to make the hole?