An External Connector license permits access by any number of external users, as long as that access is for the benefit of the licensee and not the external user. Each physical server that external users access requires only one EC license. One can purchase individual CALs or an EC license for external users. This decision on whether to acquire CALs or an EC for external users is primarily a financial one. The right to run instances of the server software is licensed separately; the EC, like the CAL, simply permits access.