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function addLink() {
  var body_element = document.getElementsByTagName('body')[0];
  var selection;
  selection = window.getSelection();
  var pagelink = "<a href='" + document.location.href + "'> Источник: www.AzbukaDiet.ru</a>";
  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;