I stumbled upon post at ps3iso
apparently TB bypasses the 8001003C error.
I decrypted / resigned the MKAK 1.02 update and Tekken Hybrid.
Both play with TB plugged in but shows 8001003C error when it's not.
Got no TB so donīt know just sharing
Well gone try another machine later for creating a eboot for skyrim.
If that will not work there most be something in my key set of my scetool.