And remember, anyone that knows your header block protocol can sell replacement software or modules and it would be hard for you to halt it. Think about your unhappy employees that would like to go into business WITHOUT the bother of building the hardware.

The best security proceedure was used by the Egyptians when burying a Pharoah... the burial team were afterwards executed to protect the secret. Adopting this practice may be in violation of OSHA or other laws though, first seek legal advice. ;)

duh