Time Machine and App Serial Numbers/Registrations

Hey everyone,

I recently wiped my hard drive and reinstalled snow leopard from scratch, but not before doing a Time Machine Backup just in case. I did not restore my whole system from time machine because I do not plan on keeping everything I had. Anyways, I just hooked time machine up and restored some of my old applications. When opening these applications it is asking me for the serial numbers or registrations. Does anyone know know where on my old harddrive all the serial numbers and registrations were kept, or how I could restore these another way?

Thanks,
BlizZ10