Mark S. Miller has advocated what he calls "admonition systems". http://www.caplet.com/security/taxonomy/admonition.html Those are user interfaces which inform the user clearly that the author of the file has requested that you, the user, not do certain things, but which also makes it clear how to direct your software to do as you bid once you have chosen to respect or disrespect the request.
This would be a nice solution to the dilemma of okular -- when an action is attempted that is not allowed by the drm bits, okular could open a dialog box saying "The author of this file has requested that you not copy text from it. The current setting of okular is to disable the copy feature when the author has made such a request. If you wish to enable the copy feature despite this request, please see "Settings > configure okular > obey drm".