The current issue is the 2D barcode easy be scratch by pencil or nail. The scratch
always makes scanner failure. For a test, standard needs using the 2H pencil to repeat
scratch barcode and the barcode still could be read.
The invention carving the barcode inside the cover and illumination with light. The
pattern will appear at the outside of cover then barcode could be read by the scanner.
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INC, HP, "LIGHTING BAR CODE", Technical Disclosure Commons, (November 20, 2018)