m = 'All rights reserved.';
  
function md(e) {  
  try {
    if (event.button==2 || event.button==3) {
      alert(m);
      return false;
    }  
  } catch (e) { 
    if (e.which == 3) {
      alert(m);
      return false;
    } 
  } 
}

document.oncontextmenu = function() { alert(m); return false; }
document.onmousedown   = md;

// document.ondragstart   = function() { alert(m); return false; }