Look what I found:
"Information technology  Automatic identification and data capture
techniques  Bar code symbology  QR
Code"
http://raidenii.net/files/datasheets/misc/qr_code.pdf

On Thu, Feb 17, 2011 at 2:15 PM, Peter Flynn <pflynn@xxxxxx> wrote:
> On 17/02/11 12:52, Martynas Jusevicius wrote:
>>>> But I can't find the QR code specification. It seems that you have to
>>>> pay to get it from ISO.
>>>> And I was hoping standards were free and open in the 21st century...
>>>
>>> Don't be afraid to get your wallet out...   :)
>>>
>>
>> I was thinking about this transformation as an exercise in XSLT, not
>> smth I'm very interested in commercially.
>> And I don't feel like paying for stuff which I think should be free in
>> the internet age.
>> If I find it somewhere, I'll post a link ;)
>
> QR codes are implemented for LaTeX in the pst-barcode package [1], so
> presumably the authors (Terry Burton and Herbert Vo_) got the doc from
> somewhere.
>
> pst-barcode is implemented in Postscript vectors, and fully documented
> [2], so if your reverse Polish is up to snuff...:-)
>
> ///Peter
> --
> 1. http://www.ctan.org/tex-archive/graphics/pstricks/contrib/pst-barcode/
>
> 2.
>
http://mirror.ctan.org/graphics/pstricks/contrib/pst-barcode/pst-barcode-doc.
pdf