How to protect pdf from editing?

Question

Python

Tell me how you can protect pdf from editing?
I made a watermark on pdf, it is removed using Master PDF Editor.
Deletes everything, both the picture and the text.

Answer 1

I found pdftk, and with the help of it I already set a password for pdf.
Implementation in Python3, maybe someone will come in handy. Puts a watermark on pdf and puts a password from editing.
https://github.com/Uonekhton/pdf-watermark

Answer 2

password for editing, etc.
but in general there are no
solutions, only special ones - DRM-like

Answer 3

Make something like a scanned pdf, i.e. save the data as an image, and then put it in pdf