[TomasHubelbauer]

This is great, thanks for posting it. I've had the same idea myself and started and abandoned this exact same project a few times. Same down to cutting the SDP up into multiple QR codes. I am glad to see this brought to life.

I am also surprised to see @nilknarf has done that in 2014! (As per their comment.) Don't know how I didn't come across his post during my research into this, but checking it now, someone in the comments posted a link to a patent which captures this idea.

http://www.freepatentsonline.com/20160021148.pdf

The patent must be invalid, because it's from 2016 and there is clearly prior art, but it kind of sucks, because it basically means polishing something like e.g. @phiresky has done with the remote pen just means if you succeed in bringing down the time to connect and make it something usable enough for users, you're opening yourself up to a claim if you decide to package it up into an app.

[AquiGorka]

> opening yourself up to a claim if you decide to package it up into an app

Even though there is public domain tech from 2014 using it? (@nilknarf's).

I was under the impression when something is part of the public domain there can't be a patent claim on it.

[TomasHubelbauer]

I think this patent has been mistakenly granted this year:

https://patents.google.com/patent/US20160021148A1 (see the "grant" status line)

I think it should not have been granted there being prior art, but for it to be turned over, I think it would have to be challenged in court. That's my limited understanding as a non-US person without any experience with patents whatsoever.

[AquiGorka]

Oh wow, I am shocked to see the patent was granted and I'm very interested in understanding the repercussions. These might be big.