Yeah... don't worry- I had no idea what a QR Code was either. In fact, I still only bearly get it.
From Wiki:
"A QR Code is a matrix code (or two-dimensional bar code) created by Japanese corporation Denso-Wave in 1994. The "QR" is derived from "Quick Response", as the creator intended the code to allow its contents to be decoded at high speed. QR Codes are common in Japan, where they are currently the most popular type of two dimensional codes. Moreover, most current Japanese mobile phones can read this code with their camera."
Anyway, so now people are incorporating design into QR so that they have a cool look- but are fully functional. This is where Murakami comes in for LV. From HighSnobiety:
"Mixing design with technological innovation, SET teamed up Takashi Murakami with Louis Vuitton to create a distinctive code featuring one of the artist’s characters and the classic LV pattern. The agency hopes this will add much needed style and character to the bland world of machine readable codes."
Well, there you go! 
(Edited to fix the image... SET emailed to let me know that I'd posted one that wasn't the current code.)
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hi
would be very grateful if you could switch the code pictured above to the one on our blog now or email me and I will send you a hi-rez version. The one above is not the one being used for the campaign.
thanks
g
Hi
We designed the code that you posted. But the one your using is the wrong color for some reason. Can you please use the one from our blog (url above) or e-mail me and i will send you a JPEG version. It would be much appreciated,
Warm regards
SET
Greg & SET,
Hope this one’s right. The color is much richer in this one. Good work, and thanks for letting me know!
Sarah
i really wish people would stop posting this QR code…. it doesn’t work.
There are so many other good examples of qr codes out there that no one should really care about this Louis Vuitton’s variation.
http://deancollinsblog.blogspot.com/search?q=qr
Cheers,
Dean
Dean, Greg, who designed this code sent this:
“The LV QR code was meant for domestic use only. Consequently in the testing of the code we conducted trials using handsets from the three phone companies, Au, Docomo and Softbank. We literally did not have the time to test it using phones used overseas and there really didn’t seem to be too much point. Scanning blogs from around the planet I have noticed comments from people saying that there phone cannot decode it. But i have noticed just as many, if not more, saying that they have been able to do so. Japanese phones are equipped with higher grade lenses and upgraded software to deal with issues such as macro settings etc. This would account for some of the issues abroad.”
Sarah