> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Craig Lee
>
> Is should be possible to use an XTAL and free the OSCAL value for
> programming of a special code.  If someone simply copies your program,
> and reproduces it, the OSCAL value will not match.
[cut]
> Another idea is to do a bunch of current measurements at
> production, and store them in eeprom.  Then if the detected current
> at specific stages is in-correct, due to probe load, disconnected
> I/O, etc., the unit could  become evil and inflict it's wrath!
> Craig

You know, thats finally a constructive technique.
I will save your mail under my folder : NiceToRemember

Regards
  Benjamin Petersen