How To Disable Copy and Paste Using Javascript

<div style="height:480px; width:700px; margin:auto; padding:40px; border:2px solid #1982d1; border-radius:10px;">
<center>
	<h2 style="color:#1982d1;">DISABLE COPY AND PASTE</h2>
</center>
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<!-- Disable Copy and Paste-->
<script language='JavaScript1.2'>
function disableselect(e){
return false
}
function reEnable(){
return true
}
document.onselectstart=new Function (&quot;return false&quot;)
if (window.sidebar){
document.onmousedown=disableselect
document.onclick=reEnable
}
</script>
 
<script>
//disable mouse drag select start
document.onselectstart = new Function('return false');
function dMDown(e) { return false; }
function dOClick() { return true; }
document.onmousedown = dMDown;
document.onclick = dOClick;
$("#content_document").attr("unselectable", "on"); 
//disable mouse drag select end
//disable right click - context menu
document.oncontextmenu = new Function("return false");
//disable CTRL+A/CTRL+C through key board start
 
//use this function
function disableSelectCopy(e) {
// current pressed key
    var pressedKey = String.fromCharCode(e.keyCode).toLowerCase();
    if (e.ctrlKey && (pressedKey == "c" || pressedKey == "x" || pressedKey == "v" || pressedKey == "a")) {
        return false;
    }
}
document.onkeydown = disableSelectCopy;
 
//or use this function
$(function () {
    $(document).keydown(function (objEvent) {
        if (objEvent.ctrlKey || objEvent.metaKey) {
            if (objEvent.keyCode == 65 || objEvent.keyCode == 97) {
                return false;
            }
        //}
        }
    });
});
</script>