Re: QR Code on QSL card
The qr-code does not contain generic information, but contains the data relating to the Qso to which the QSL refers. Here is a Qsl as currently managed by DARC and as IARU expects it will be managed in the future. Reading the qr-code you will notice that it contains all the information printed on the qsl.
73 de Raoul, ik0rcy