title: How to provide licence for a Qt App?
body: <p>I saw in Qt's download page (http://qt.nokia.com/downloads) that Qt is available under GPL v3, LGPL v2 and a commercial license. I installed Qt with the Windows offline installer, downloaded from that download page.
  I finished my app and i want to make everything perfectly in the licence area.
  My app is closed source, free and links dinamicly, so LGPL v2 is ok for it. But where, and how do I inform the users about the licencing? Do I have to write it in a txt or into the program? Do I have to provide a licence for every qt .dll files? Ow how do I required to do it?
  Anyway, where do i know that im using the LGPL version of Qt and not the GPL v3? Or the two are the same (from the installed QT SDK view), and I can decide which licenc do I want to use when I publish my work?
  So if I change my mind and I want to put my app under a GPL v3 licence, the only thing I have to do is provide a different licence?</p>
  
  <p>(Note: I know there are differeces between the requirments of GPL v3 and LGPL, but now I'm interested in the procedure of licence deploying.)</p>
  
  <p>(Sorry for bad english)</p>
  
  <p>Thanks</p>