function addLink() { 
    var body_element = document.getElementsByTagName('body')[0]; 
    var selection; 
    selection = window.getSelection(); 
    var pagelink = "<br />Más información: <a href='"+document.location.href+"'>"+document.location.href+"</a><br />"+"Copyright © <b>Herconet Ltda.<br />http://www.herconet.com/terminos-y-condiciones-herconet-ltda<br />"; 
    var copytext = pagelink + 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;