qr-hd.org
QR code compared to VOICEYE - High Density codeWon the Da Vinci Awards. For having their print magazine accessible to people with reading challenges, low vision or blind, through embedding HD codes on their editorial pages. QR vs HD Codes. The difference between QR (Quick Response code). And VOICEYE (High Density code):. The use of QR codes is free of any license. The QR code is clearly defined and published as an ISO standard. Denso Wave. Owns the patent rights on QR codes, but has chosen not to exercise them. Possible characters, default encoding.
http://www.qr-hd.org/