title: Differences between for sencha Ext Js with the open source and the commercial licenses
body: <p>I will built an applications using Sencha Ext JS. 
  I tried a little application in order to lean it. But I was wonder what are the difference between the GPL and the commercial license?
  I noticed that the code is exactly the same, and the way on programming also.
  So what are the advantages to buy the commercial license?</p>
  
  <p>Thank you</p>