Modern cameras return a serial number over usb, so that would be an obvious choice. The serial numbers themselves aren't very user friendly, but it it be very easy to map them to numbers or names.
(I'd like to add the ability to optionaly include the serial number in DNG exif at some point anyway)
For the old cameras that don't return a serial, my plan for multicam was just to write a file with a unique id on the camera. I don't see any particular reason it should be in the CHDK menu.
I've seen people use the owner name for book scanners, but you have to set that with canon tools or gphoto.
Started by jphphotography
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General Discussion and Assistance
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DSLR Hack development
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Hotwire! Hardware Mods, Accessories and Insights
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General Help and Assistance on using CHDK stable releases