Disable Right click using jQuery

Method : 1

$(document).ready(function(){

    $(document).bind("contextmenu",function(e){

        return false;

    });

});

Method : 2

$(document).ready(function(){

    $(document).bind("contextmenu",function(e){

        e.preventDefault();

    });

});

Disable Enter key on page using jQuery

$("#form").keypress(function(e) {

  if (e.which == 13) {

      return false;

  }

});

Disable Cut,Copy and Paste functions for textbox using jQuery

$(document).ready(function(){

  $('#txtInput').bind("cut copy paste",function(e) {

       e.preventDefault();

  });

});

Note : 

Generally why we are using
preventDefault is, it will stop the default behavior of its eventand thus the default action (of showing context menu) is stopped here.

Thanks