title: why symmetricDS community edition ask for license key?
body: <p>i already downloaded symmetric-3.5.19-server.zip for community edition
  after i following this step <a href="http://www.symmetricds.org/doc/3.5/html-single/user-guide.html#tutorial-install" rel="nofollow">http://www.symmetricds.org/doc/3.5/html-single/user-guide.html#tutorial-install</a>
  and finished it, it showing a message Missing license key. Please install a license key before using the web console.
  is the community edition require to buy a license?</p>