From Mexico.purplecow.org
Standards
There are several standards documents covering the physical encoding of QR Code: http://www.denso-wave.com/qrcode/qrstandard-e.html
License
QR Code is an open format - the format's specification is available royalty-free from its owner, who has promised not to exert patent rights on it. The term QR Code itself is a registered trademark of Denso Wave Incorporated.
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