title: Seeking FOSS licensing software
body: <p>It doesn't have to be uncrackable, just enough to dissuade casual attempts at hacking.</p>
  
  <p>FOSS - usable in commercial projects.</p>
  
  <p>Limit number of consecutive sessions. </p>
  
  <p>I have my own ideas as to how to code it simply. But why reinvent the wheel?</p>
  
  <hr>
  
  <p>Edit: To limit the number of consecutive session I was thinking of a simple counter in the databse (obfuscated somehow), which increments on login and decrements on logout. The tricky part is when someone closes the browser (and their session) without loggin out.  </p>