title: JavaScript make captcha text not copyable
body: <p>I am using client side captcha for basic spam protection, and my created script generates random numbers. I give background ('noisy')  image to the input where I display my generated numbers  and I have used:</p>
  <pre><code>$('#nrx_txtCaptcha').bind(&quot;contextmenu&quot;,function(e){
            return false;
     });  
  </code></pre>
  <p>to disable right click but when highlight captcha textfiedd's  numbers you can copy that via <kbd>ctrl</kbd>+<kbd>c</kbd>. So how to make it not copyable? Or there is a way I can make it not &quot;highlighable&quot; ?</p>