I just learned this is actually a thing—not only that it *was* a thing, but still *is* a thing.

Maybe next time I tell you I won’t print your order because it’s clearly marked with a copyright notice prohibiting reproduction and you don’t have written authorization to copy it, I should mention my Canon machines most likely still do this.

#TalesFromThePrintShop

https://en.wikipedia.org/wiki/Printer_tracking_dots

Printer tracking dots - Wikipedia