(There's got to be a PDF/postscript file/print filter for the pattern somewhere. Anyone? EDIT: Ah, found it here: http://wildsparx.com/eurionize/ -- download has vanished, but source is on github: https://github.com/jplona/code/blob/master/eurionize.pl )
And I easily found some shops carrying shirts:
if you know German, here are some people from AK Vorrat planning a campaign, I don't know whether it's still up to date:
And it has been discussed before, huh:
(This is from Paint Shop Pro, version 8.0, which refuses to edit the above image)
A = B + C
TCN(A) = max(TCN(B),TCN(C)) + 1
All this is implemented using PANDA , which has nice facilities for dynamic taint analysis. I just recorded Paint Shop Pro opening the currency image, and then replayed with the taint analysis to generate the raw data used for that image.
The limitation currently is that the granularity is not great (you can see that there are relatively large rectangular sections of the image with the same compute number). My guess is that this is because a lot of image processing algorithms at the lowest level end up being "multiply the image data matrix by this other matrix and pick out the nonzero entries" or some such -- so all the data there has the same amount of computation done on it. But apparently there is some sort of multi-pass algorithm at work here, which gives rise to the differing amounts of computation done on each region. I'm looking at ways to improve the granularity right now, possibly by incorporating the magnitude of the transformation on the data somehow.
The second (eurion_tcn.mp4) one is simpler, and just tracks the mapping between pixel and compute number  over time.
This patent describes how it is recognized: https://www.google.com/patents/US20060279767 The short version of which is "find all the circles, measure the distance between them; if you find five with the right distances you've found EURion".
"In the late 1980s, a new counterfeit hundred, the most perfect counterfeit yet made, began appearing in circulation. It looked identical to the real thing, betrayed visually, at least, under only the most rigorous forensic testing. (Some minor flaws were visible after enormous copies of the bills were made, but these were probably purposeful. Its makers didn't want to be suckered by their own handiwork.) Although the counterfeit came to America mostly on boats from gangs in China, it was eventually traced to North Korea, where it was believed to have been manufactured by the North Korean government on its own presses. Since then, new generations of the same counterfeit have appeared, including a big-head version, mimicking the redesigned hundred that entered circulation in 1996. This family of bogus notes has been given its own title, one that befits its almost mythical stature: the North Korean supernote."
"Some stories about the supernote sound more like legend than fact — like its being laundered by a bank in Macao called the Banco Delta Asia, or several thousand of them somehow appearing overnight in Lima, threatening to tip over the entire Peruvian economy. But there remains one truth in the supernote's history that has never been forgotten: It was first detected at the Central Bank of the Philippines by a teller, given pause only by the same nebulous flaw that betrays the majority of counterfeits. It just didn't feel right."
Photo attached :)
American banknotes are apparently made from 75% cotton and 25% linen. I'm not sure how the different banknotes internationally and across history stack up in terms of durability but the newer Euro notes (the 5, 10 and 20 notes introduced in 2013, 2014 and 2015 respectively) are supposedly more durable than the older ones.
Cotton money gets all soggy and you can't really use it without drying it out. Plastic money is great for this... wipe it off and buy an ice cream.
Thus why the bridge series was introduced in 2007, to add much needed security features and to make Scottish notes respectable again.
"It is an offence for any person, unless the relevant authority has previously consented in writing, to reproduce on any substance whatsoever, and whether or not on the correct scale, any British currency note or any part of a British currency note."
(This is separate from the actual counterfeiting offence, which requires intent that you or another person will pass off the copy as genuine.)
The art project would probably be OK if you get permission from the Bank of England first: http://www.bankofengland.co.uk/banknotes/Pages/reproappform....
A lot of "stage money" has a washed out fake on the other side just in case it gets caught on film (so at least the colors are right). Same colors, the words are nonsense, and none of the detail remains.
You can't take a lower denomination bank-note and print a higher denomination one on an Euro note: the sizes are different (of course, maybe you can pass one note for the next in sequence, but it is slightly harder)
Also no RFID is mentioned here https://en.wikipedia.org/wiki/Euro_banknotes#Security_featur...
and it says
"This case was the result of an investigation by the U.S. Secret Service, the Minneapolis Police Department, and the Federal Bureau of Investigation."
I think the protection is often done in the hardware (firmware), not drivers. At least it has to be for any printer/scanner that can work as a standalone copier.