Map box access token technique

Hello All,

Currently we have installed Vector tiles in our own server and we can Access those from mapbox SDK i.e mapView.setStyleUrl("http://ourserveraddress.com/styles/bright/style.json");

but as you can see this url is open and any one can access it.

Since we are not using Mapbox Access Token , how can we protect our Url from public to abuse ? I would be greatfull if any one give me some lights on this. Thanks