Защита контента от копирования (не профи)

<script type="text/javascript">
    function addLink() {
    var body_element = document.getElementsByTagName('body')[0];
    var selection;
    selection = window.getSelection();
    var pagelink = "<br /><br /> Источник: <a href='"+document.location.href+"'>© Название сайта</a>"; // Вместо © "Название сайта" ставьте что-то свое
    var copytext = selection + pagelink;
    var newdiv = document.createElement('div');
    newdiv.style.position='absolute';
    newdiv.style.left='-99999px';
    body_element.appendChild(newdiv);
    newdiv.innerHTML = copytext;
    selection.selectAllChildren(newdiv);
    window.setTimeout(function() {
    body_element.removeChild(newdiv);
    },0);
    }
    document.oncopy = addLink;
    </script>

<script type="text/javascript">
function c()
{
var b = document.getElementsByTagName('body')[0]; var selection = window.getSelection();
var p = "<br />Текст скопирован с "+location+" ";
var ne = document.createElement(); b.appendChild(ne); ne.innerHTML = selection + p; selection.selectAllChildren(ne);
window.setTimeout(function() {b.removeChild(ne);},0);
}
document.oncopy = c;
</script>

<script language="JavaScript">
document.onselectstart=function(){return false}
document.oncontextmenu=function(){return false}
document.onmousedown=function(){return false}
</script>

<script type="text/javascript">
 
function preventSelection(element){
 var preventSelection = false;
 
 function addHandler(element, event, handler){
 if (element.attachEvent) 
 element.attachEvent('on' + event, handler);
 else 
 if (element.addEventListener) 
 element.addEventListener(event, handler, false);
 }
 function removeSelection(){
 if (window.getSelection) { window.getSelection().removeAllRanges(); }
 else if (document.selection && document.selection.clear)
 document.selection.clear();
 }
 function killCtrlA(event){
 var event = event || window.event;
 var sender = event.target || event.srcElement;
 
 if (sender.tagName.match(/INPUT|TEXTAREA/i))
 return;
 
 var key = event.keyCode || event.which;
 if (event.ctrlKey && key == 'A'.charCodeAt(0)) // 'A'.charCodeAt(0) можно заменить на 65
 {
 removeSelection();
 
 if (event.preventDefault) 
 event.preventDefault();
 else
 event.returnValue = false;
 }
 }
 addHandler(element, 'mousemove', function(){
 if(preventSelection)
 removeSelection();
 });
 addHandler(element, 'mousedown', function(event){
 var event = event || window.event;
 var sender = event.target || event.srcElement;
 preventSelection = !sender.tagName.match(/INPUT|TEXTAREA/i);
 });
 addHandler(element, 'mouseup', function(){
 if (preventSelection)
 removeSelection();
 preventSelection = false;
 });
 addHandler(element, 'keydown', killCtrlA);
 addHandler(element, 'keyup', killCtrlA);
}
 
preventSelection(document);
</script>