One option would be to turn it into an image which is then put into the pdf. Not impossible to change just more work to change.

On Fri, Aug 6, 2021 at 11:48 PM Steve Litt via PLUG-discuss <plug-discuss@lists.phxlinux.org> wrote:
joe--- via PLUG-discuss said on Fri, 06 Aug 2021 16:48:59 -0700

>How to make a pdf read only?
>
>I'm sure I've done this in the past,
>but can't remember how. Searched the
>net but found no solution.
>
>Do not want to convert to an image
>but just want a read-only pdf.

I think it's impossible to make a truly read-only pdf. Somebody could
always open it in Vim and tamper with it, or use one of the several PDF
modification tools to convert it to a form that can be written to. Or
import it into Inkscape, modify it as an image, and convert back to PDF.

If you mean make it so it's not modifyable in Acrobat, there's probably
a way to do that.

SteveT

Steve Litt
Spring 2021 featured book: Troubleshooting Techniques of the Successful
Technologist http://www.troubleshooters.com/techniques
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