It's been there for a long time... (Score 1)

In Germany manufacturers of colour photocopiers are required by law to add a feature which will prevent the user from photocopying bank notes. It has been in effect since colour photocopiers were available and affordable also to smaller companies or individuals. It works by detecting a bank note in the first place and refusing to print. It doesn't add flaws or small inaccuracies, therefore a high resolution printout of a PCB layout - as pointed out before - is no problem at all.