http://your-server/rest/getLicense.view
Since 1.0.0
Get details about the software license. Takes no extra parameters. Please note that access to the REST API requires that the server has a valid license (after a 30-day trial period). To get a license key you can give a donation to the Subsonic project.
Returns a <subsonic-response> element with a nested <license>
element on success. Example.