I saw this which seems to say using a QR code is freely allowed: 
http://www.qrcode.com/en/faq.html

On Thursday, December 28, 2017 at 11:19:27 AM UTC-5, matthe...@gmail.com 
wrote:
>
> Here's the aztec patent that's in the public domain: 
> http://www.adams1.com/patents/US5591956.pdf
>
> For QR it seems that the "patent is not exercised": 
> https://stackoverflow.com/questions/3710937/what-is-the-spec-for-formatting-data-in-qr-codes-i-can-not-find-it-anywhere
>
> So I suggest we do use the aztec code. I've started a github project with 
> the Apache 2.0 license where I'll add an initial API soon: 
> https://github.com/pciet/aztec
>
> Perhaps the central authority could be a blacklist instead of a whitelist? 
> While the report indicates Kenya has no law against drug counterfeiting we 
> could aid in notifying authorities and providing evidence in places that do 
> have these laws.
>
> I'd assume most CA's would remove organizations misrepresenting 
> themselves. But is that the case for all of them?
>
> Matt
>
> On Wednesday, December 27, 2017 at 10:25:07 AM UTC-6, Tamás Gulácsi wrote:
>>
>> Yes, exactly.
>> That's why I think this needs some central authority - maybe 
>> cross-signing the manufacturer's public key is enough.
>
>

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