Paper driving licences (old style) have/had that sort of security feature. It prints the word COPY. If you have one take a look - it basically has a background of thin red lines all vertical. The word COPY is made up from thin red lines that go at angles to the vertical. If you have a linen tester (loupe) you can see it quite easily. Or else take a copy of a licence and you will see it.
This would need to be printed by a specialist printer I believe. I recently did some certificates that needed something similar. I can give you the name of the printers used if you like; they were incredibly helpful and knew their stuff.