I now wish I had the ability to create a shape that I can "lockdown"

By lockdown I mean lock in place but still be able to print it and export it. I just don't want anyone, including me, to inadvertently move/delete/alter the shape. Ok, if you must know, a company watermark pattern.

Perhaps the 2019 version can do this?

 Also tried using the page background feature t but then you can't put anything behind it.