You don't need a licence for the gateway - whether you take it from our packages or from source... its totally open source. There are no licences at all for the gateway.
Licences are required for the dashboard, however, and the dashboard is proprietary software and the source is not available for that. We do give licences away for free however, at a smaller scale, and they are fully commercial licences.
Also, anything you can do in the dashboard, you can do from the command-line/files - there are no features of the gateway restricted to the dashboard.
Hope that helps.