paul13walnut5 said:PIN No- not a great idea. See point about internal memory charge.
As I wrote - you can just hardcode it in some ic when the camera is built, just like Intel used to hardcode a serial number into their PentiumIII processors until they were stopped due to privacy concerns. It's non-changeable and non-erasable, you could just disable it after being entered, and after a battery drain the default setting would be enabled.
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