Password Protect Airprint

Not that I'm aware of. You could turn off the printer.

Maybe Adding another router to the network and have his own password protected router he can attach his devices including printer.

That probably won't work as he probably wants to printer directly to the printer and not through a router.

What I mean my apologies is create another network with another router. My roommate does it he has another router and adds devices he needs for work. That one has its own password protection as you would your normal network. If he adds another wifi router it can have its own password and he can use that to support his own devices.

I don't know whether this is relevant or not. Maybe it is just about direct internet access to the printer from "outside".

When I downloaded the firmware update needed by my new 8500A printer, it then printed out a marketing piece on Web-Enabled Mobile Printing. It tells you to create an Allowed Senders List to manage access to your printer. It then says in very tiny print

"If you don't create this list, anyone can send e-mail to your printer."

So there you go. Actually I don't know whether it was downloading the firmware or some other setup thing I did that triggered this printout. Anyhow, HP has assigned an email address to my printer. Holy cow. Maybe that's howcum I got this marketing piece.

So the answer seems to be "yes" about some kind of password protection. (And it sounds like the first sender to protect against might be HP themselves.) But I don't know whether it applies to devices on the same local network or not.

Good luck and let us know.