First, QR codes are similar to barcodes but are square, hold more information, and are easily scanned with a digital camera lens like the one in your phone. No cumbersome laser scanner needed.
Just download the QR Scanner application that’s commonplace on Japanese phones and catching on here in the states.
is capable of reading a QR i.e. three stickers on a rental movie box. One for good. One for bad. One for ok.