< script type = " text/javascript " >

    document.oncontextmenu = function (){

return   false };

    document.ondragstart = function (){

return   false };

    document.onselectstart  = function (){

return   false };

    document.onselect = function (){document.selection.empty();};

    document.oncopy = function (){document.selection.empty();};

    document.onbeforecopy = function (){

return   false };

    document.onmouseup = function (){document.selection.empty();};

< / script>