Just add this javascript below your footer.
JavaScript:
<script language="JavaScript">
/**
* Disable right-click of mouse, F12 key, and save key combinations on page
* By Arthur Gareginyan (arthurgareginyan@gmail.com)
* For full source code, visit https://mycyberuniverse.com
*/
window.onload = function() {
document.addEventListener("contextmenu", function(e){
e.preventDefault();
}, false);
document.addEventListener("keydown", function(e) {
//document.onkeydown = function(e) {
// "I" key
if (e.ctrlKey && e.shiftKey && e.keyCode == 73) {
disabledEvent(e);
}
// "J" key
if (e.ctrlKey && e.shiftKey && e.keyCode == 74) {
disabledEvent(e);
}
// "S" key + macOS
if (e.keyCode == 83 && (navigator.platform.match("Mac") ? e.metaKey : e.ctrlKey)) {
disabledEvent(e);
}
// "U" key
if (e.ctrlKey && e.keyCode == 85) {
disabledEvent(e);
}
// "F12" key
if (event.keyCode == 123) {
disabledEvent(e);
}
}, false);
function disabledEvent(e){
if (e.stopPropagation){
e.stopPropagation();
} else if (window.event){
window.event.cancelBubble = true;
}
e.preventDefault();
return false;
}
};
</script>