Both the Bayes Server User Interface and the Bayes Server APIs operate in trial mode until a license key is activated.
You can activate a license key in the user interface, by clicking the License button on the Start page, or by opening the About dialog.
Bayes Server API
You can activate a license key in the API by calling
BayesServer.License.Validate("<license-key-goes-here>") at the start of your program, passing in your license key.
If you are using a distributed version of Bayes Server (e.g. running on Apache Spark) you will need to make sure this is called on each machine.