QR codes can hold arbitrary data (binary, contact info, etc.) and has error correction (you can lose part of it due to sun bleaching, tearing, etc. and it still

QR codes can hold arbitrary data (binary, contact info, etc.) and has error correction (you can lose part of it due to sun bleaching, tearing, etc. and it still scans). https://blog.qrstuff.com/2011/12/14/qr-code-error-correction https://blog.qrstuff.com/2011/12/14/qr-code-error-correction It's a wonderful technology.