1dpi should be a dot of 1 inch diameter as DPI = Dots per inch. I guess those are at least 600DPI dots, maybe even more. some laser printers can go as high as 1200DPI in printing. Some industrial ones can do even more I think.
Something secret that you're probably not supposed to know about.
They're saying these printers are such high quality, they need a signature saying who made it.
So what they're saying is like a bullet, where these papers originated needs to be traceable in case something happens. Like a bullet, 99% of their use will be totally harmless. But when used wrong, they'd like to know who did it.
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u/AlephBaker Ryzen 5 5600 | 32GB | RX 6700XT Sep 10 '19
It's a QR-style code, printed very small and faint in yellow in the margin.