¿Cómo insertar un enlace automáticamente al copiar contenido?

<script type="text/javascript">
//Cambiar mi.DOMINIO.com
var Ancla = ["mi.DOMINIO.com", "DOMINIO.com", document.location.href, document.title];
var Texto = ["Fuente:", "Leer completo:"];

var AnclaRandom = Ancla[Math.floor(Math.random() * Ancla.length)];
var TextoRandom = Texto[Math.floor(Math.random() * Texto.length)];

function addLink() {
var body_element = document.getElementsByTagName('body')[0];
var selection;
selection = window.getSelection();
var pagelink = "<br /><br />"+TextoRandom+" <a href='"+document.location.href+"' href='"+document.title+"'>"+AnclaRandom+"</a>";
var copytext = selection + pagelink;

var newdiv = document.createElement('p');
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 addLink() {
 var body_element = document.getElementsByTagName('body')[0];
 var selection;
 selection = window.getSelection();
 var pagelink = "<br /><br /> Artículo sustraído de: <a href='"+document.location.href+"' Title="ANCHOR TEXT">ANCHOR TEXT</a>"; // Mensaje que aparecerá al copiar
 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 addLink() {
 var body_element = document.getElementsByTagName('body')[0];
 var selection;
 selection = window.getSelection();
 var pagelink = "<br /><br /> Artículo sustraído de: <a href='"+document.location.href+"' href='"+document.title+"'>"+document.title+"</a>"; // Mensaje que aparecerá al copiar
 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>