What is the license model of modules bougth in DoliStore?

Is it allowed to use modules bought from DoliStore in multiple Dolibarr instances and projects or do I need to buy it for every instance separately? We plan to offer Dolibarr Saas and are wondering, if we are alloowed to include modules we bought once in every instance of the software maintained by us. Or do we need to contact every module seller first for license info?

Thanks,
Irgi