Agile Toolkit provides universal way for checking licenses. If
you are building commercial product with Agile Toolkit, then
you need to use unique identifier for $software. Provide the name
of your public key certificate and also supply md5sum of that
certificate as last parameter, to make sure developer wouldn't
simply substitute public key with another one.
Public key must be bundled along with the release of your software
This method will return true / false. If you have multiple public
keys (expired ones), you can call this method several times.
The information about the private key specifically issued to the
user will be stored in configuration file.
