[Fester Bestertester]

Hmmm...

So it sounds as if the user wants to share the document but doesn't want
other users to be able to see the markup at all, they need to copy all
the text into a new document?

Tony Jollans wrote:
Whether or not the document opens this way is (partly) a user-controlled
option. You have no control over what others see in this situation.

If you have the security option you mention cleared both when you save
the document and when you open it you should not see the markup.