function noCopy(teclapress) {
 if(navigator.appName == "Netscape") {tecla = teclapress.which;}
 else {tecla = teclapress.keyCode;}
 
 var ctrl = teclapress.ctrlKey;
 
 if (ctrl && tecla==67) {return false;}
 if (ctrl && tecla==86) {return false;}
}

$(document).bind('keydown',noCopy);
$(document).bind('copy',function(){return false;});