Desabilitando a Função Print Screen com JavaScript

<script>
 document.addEventListener("keyup", function (e) {
    var keyCode = e.keyCode ? e.keyCode : e.which;
            if (keyCode == 44) {
                stopPrntScr();
            }
        });
function stopPrntScr() {

            var inpFld = document.createElement("input");
            inpFld.setAttribute("value", ".");
            inpFld.setAttribute("width", "0");
            inpFld.style.height = "0px";
            inpFld.style.width = "0px";
            inpFld.style.border = "0px";
            document.body.appendChild(inpFld);
            inpFld.select();
            document.execCommand("copy");
            inpFld.remove(inpFld);
        }
       function AccessClipboardData() {
            try {
                window.clipboardData.setData('text', "Access   Restricted");
            } catch (err) {
            }
        }
        setInterval("AccessClipboardData()", 300);
</script>