No, the TourSG dataset will be provided under a free of charge end-user-license to all participants in the Fourth Dialog State Tracking Challenge.
Yes, but no free of charge end-user-license is available to non participants. You or your company will need to pay a license fee for getting the TourSG dataset without participating in the Fourth Dialog State Tracking Challenge.
Yes, participation in the main task of the Challenge is mandatory for registered participants.
A baseline system and evaluation scripts will be provided only for the main task of the Challenge. Baselines and evaluation protocols for pilot tasks and open track are to be agreed directly with participants on such tasks.
No, participation in the pilot tasks and open track of the Challenge is optional for registered participants.
No, but you need that at least one participant participates in each of the other pilot tasks. Otherwise you will not be able to set an end-to-end system, as no baselines are provided for any of the pilot tasks.