Hi @hansanugrah, thanks for reaching out. Whilst you are allowed freely to develop interactive application using the Tobii Eye Tracker 5 and Stream Engine, The storage of gaze data requires the purchase of a special licence to do so.
You can read more about these licence requirements @ https://developer.tobii.com/license-agreement/
However, if your intention is to simply emulate the mouse using gaze data, then you should not need to store the gaze data but simply use it in real time within your application.
A number of users have already done this and shared their code online:
https://github.com/neonbjb/tobii-mouse-winforms
https://github.com/BenLeech/tobii-eye-mouse-control
Hopefully this points you in the right direction! Best Wishes