Many of my applications run solely from 3V supply. Some circuits are 
very simple and most of the work has gone into the code development.

I would like to provide a level of protection to each application to at 
least prevent someone directly reading the code via ICSP and then 
programming their own copy of my unit.

First I was considering placing a code in the serial number part of each 
micro controller and have my code read and validate the correct code 
before running the application. (Have not tried it yet).

For the 5V supply projects I could easily just set all the code 
protection bits and if I needed to reprogram the device I just did a 
bulk erase and reprogrammed it.
The problem is that the bulk erase requires 4.5V.

Can I partially protect the code that would prevent all the code being 
read but still enable me to reprogram the chip if I needed to.

Thanks in advance.

Regards

David

Oh yeah, happy New Year to you all.
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