I use Google Docs (Drive) to share PDFs with my customers.
For each PDF, I've selected "prevent users from downloading" for IP reasons.
When users try to print the document they get an error 404 page. I've tried this myself on all "modern" browsers and the same occurs.
I don't get it. Google displays a printer icon plus it makes the option available in the file menu, but on all occasions printing results in an error 404 page appearing.
I've tried Google's product forums and Twitter to absolutely no avail.