title: Android application unique license key
body: <p>I am developing a mobile app which would need constant interaction with the web site using web service. For this purpose I am planning to have some kind of unique mobile ID which can be generated at the time of application download  by the user. This unique ID will be used for website login from mobile and can be sent for validation when user submits any reviews or syncs with the server.</p>
  
  <p>Is it possible to generate some kind of unique license key for each download? And at the same time, pass on that unique key to the web site for user mobile registration. Does android market provides this facility ans if yes, then how?</p>
  
  <p>Rgds,
  Sapan</p>