title: MD5 in ActionScript
body: <p>I am trying to build a web based flash application. I am quite new to flash. I would like to develop it in two forms - demo and paid version. For this application to act as a paid version I need to have some kind of serial key. In order to achieve this I googled and came across something like this</p>
  
  <p><code>MD5(MD5(thisuri)+thisuri)</code>  </p>
  
  <p>I think 'thisuri' points to the current url page but I don't know how to get that url and I don't know whether '+' acts as a character or an operator.</p>
  
  <p>Can you please help me?</p>