I've wondered why there are so few local/"off-line" implementations of QR encoding. Does it have something to do with rights retained by the format's originato

I've wondered why there are so few local/"off-line" implementations of QR encoding. Does it have something to do with rights retained by the format's originator (IIRC, a Japanese firm)? I've encountered everal server-based tools, but this is one of the only local, open source implementations I've seen. With respect to that, has anyone done it in Javascript? (I know, I know, if it's an itch I have...)