You could simply add stroke to that picture
In InDesign, all pictures come in frames, just give attributes to the frame of the picture

Hi David Popham,

you wrote “Have you considered using the Security pane in the Export Adobe PDF dialog to password protect your PDF proofs?”
I use this sometimes and I get a message that its not always secure, some software could override it. Do you know more about that?

I would be very happy to hear
Thank you!

thanks! great idea

I use bleed and put a marker line that will show only on the bleed
I don’t know of something better, anyone has a better idea?

There’s an excellent script for that called “MultiPageImporter2.5_DMD”