How to Disable Source code

set in <body oncontextmenu=”return false” onselectstart=”return false” ondragstart=”return false”>

and set in bottom

<script>

document.onkeydown = function(e) {
if(e.keyCode == 123) {
return false;
}
if(e.ctrlKey && e.shiftKey && e.keyCode == ‘I’.charCodeAt(0)){
return false;
}
if(e.ctrlKey && e.shiftKey && e.keyCode == ‘J’.charCodeAt(0)){
return false;
}
if(e.ctrlKey && e.keyCode == ‘U’.charCodeAt(0)){
return false;
}

if(e.ctrlKey && e.shiftKey && e.keyCode == ‘C’.charCodeAt(0)){
return false;
}
}

</script>

Javascript, Jquery