Okular, Debian, and copy restrictions

The problem with this is that it restricts what you can do if you're not "in the know". If you are in the know, of course, you'll turn it off right away, but if you don't (and don't know what to look for), you'll be stymied. This isn't a situation where understanding what's going on really is important for, say, system integrity (and hence arguably there should be some kind of knowledge barrier).

A better design, in my view, would be for the program to pop up a notification ("the creator of this file has chosen to forbid copying data") if one tried to do something forbidden, along with options "don't do this", "allow this once", "always allow this for this file", and "always allow this" (or whatever).