Disable paste in HTML editor

Hi

I want to disable cut, copy and paste in HTML editor. For HTML mode I have put this code

 //  For HTML mode$('#<%=editor.ClientID%>').find('textarea').bind("cut copy paste", function (e) {
                e.preventDefault();
            });

and this code works fine. But when I use the same code for design mode it doesn't work (See the code below)

  //  For design mode$('#<%=editor.ClientID%>').find('iframe').bind("cut copy paste", function (e) {
                e.preventDefault();                
            });

Is there any other way to do that