Disable the ctrl u keyboard shortcut

Blogger - Disable viewing page source

// disable viewing page source
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script>
	document.onkeydown = function(e) {
        if (e.ctrlKey && 
            (e.keyCode === 67 || 
             e.keyCode === 86 || 
             e.keyCode === 85 || 
             e.keyCode === 117)) {
				 alert('Content is protected\nYou cannot view the page source.');
            return false;
        } else {
            return true;
        }
};
	$(document).keypress("u",function(e) {
	if(e.ctrlKey)
	{
	return false;
	}
	else
	{
	return true;
	}
});
</script>

Not working