EmpowerID is licensed modularly for both its on-prem and SaaS deployment options. Most modules are licensed per a non-deleted managed human person, while some are licensed per Admin Person or by Managed Server. The per non-deleted human person license model allows a customer to have more user accounts managed by the system than Person objects. Each person may be the owner of many user accounts, and some user accounts will not require a person object and are managed simply as technical directory objects.
A consolidated listing of all modules is provided below. Modules bundled in base architecture are provided cost-free by default when you pay for any other modules. 
An updated list of modules and pricing can be found here at EmpowerID Cloud SaaS Pricing.
Key Takeaways:
EmpowerID can be licensed for on-prem deployment or a SaaS
Most EmpowerID modules are licensed per non-deleted named person object
EmpowerID offers modules for IGA, Access Management, and PAM