This gist can help you to prevent from view page source using ctrl + u. also this helps you to disable right click.

Disable CTRL + C or CTRL+ U || Disable Right Click

<script type="text/javascript">
    // To To Disable ctrl+c, ctrl+u
    jQuery(document).ready(function($){
      document.oncontextmenu = document.body.oncontextmenu = function() {return false;}
      $(document).keydown(function(event) {
        var pressedKey = String.fromCharCode(event.keyCode).toLowerCase();
        console.log(pressedKey);
        // i, c, j  -> open inspect element view
        // ctr + u or c -> pag src
        // f12 - 123
        if ( event.which === 123 || (event.ctrlKey && (pressedKey == "c" || pressedKey == "u")) || (event.ctrlKey && event.shiftKey && (pressedKey == "i" || pressedKey == "c" || pressedKey == "j")    ) ) {
        //alert('Sorry, This Functionality Has Been Disabled!');
        //disable key press porcessing
        return false;
        }
      });
    });
  </script>