Thank you!
I misunderstood when I posted this question and it was a bit odd, but anyway, now I have achieved what I wanted to do.

I am using Pdfium's PdfViewer in WPF, C#.
I want to prevent copying and pasting text from a PDF. in the default state, selecting text in a PDF and pressing Ctrl+C will copy the text to the clipboard.
How do I set this so that I can't do this?
Either approach is fine, either disable text selection or disable copying to the clipboard.


I want to switch the availability of copying the text from ViewModel, so it would have been ideal if I could set something like TextSelectionEnabled = false in the pdfViewer's DependencyProperty, but it doesn't seem to be possible.