This section outlines simple guidelines that your end users you can follow to detect a real license, and if you don't find one, detect a trial license.
For example, say you have chosen a trial license as a way of providing your potential customer with demo versions of your software, but your end user wishes you might first want to check whether a real license is also available. The user (Note that there is no need to check or use a trial license if your end user has already bought a real one.) For this purpose, you can use the following code example to check out a license from a server, and when it is not available, to check out a trial license. If no license is available licenses at all are available, the user will see the "Unable to checkout from trial license:\n" message, as shown below.
...