When I worked in marketing communications, we had a policy that anything that could be mistaken as final, approved assets in a printed piece had to be covered w

When I worked in marketing communications, we had a policy that anything that could be mistaken as final, approved assets in a printed piece had to be covered with a big, diagonal, magenta "FPO" label (for position only). Whether it was an inaccurate placeholder image, or a justinsomnia QR code, it had to be obvious it was not the final art.