Hi @drdevil44, okay thanks for letting us know. Interaction based applications developed with our SDK comes with no requirement for the analytical licence, so if your project is for that purpose you need not worry.
However, the use of the 4C for analytical purposes under any circumstance does require this licence to proceed correctly I’m afraid, regardless of the interface used to gather the gaze data. In fact this requirement extends at all our Tobii Range of Tracks not just the 4C, so is not tied to one particular SDK.