Very interesting. It mentions the concept was developed in 2004. I wonder how many versions are affected by this and when they started.

One of our business processes is to scan checks when customers pay and attach the image as part of the record in QuickBooks. We use a sheet of paper folder to redact the numbers of the bottom of the check. Our scanner refuses to color copy some client checks, namely from a govt agency and a startup. Thankfully we can still copy with grayscale. When this happens, we have to fully power off the scanner and boot it back up again. Best I can tell it's this pattern/hologram that triggers it.

For the same reason, I had trouble making a digital copy of my daughter's birth certificate. Before I found the gray scale trick, I ended up taking a photo with our iPhone instead.

Color copiers and color printers check for the EURion constellation too. For decades, at least in Europe.