Parallels Remote Application Server licenses can be split into one or more subsets of licenses (hereafter referred to as sublicenses), each has its own license key and supports a certain amount of concurrent connections. Each sublicense has its own date of expiration.
Main license pool
In a subscription with no sublicenses, all product licenses remain in a single array, named the main license pool. After creating a sublicense, some licenses can be used via that sublicense, while other licenses still remain in the main license pool and can be distributed to other sublicenses or used for a product activation via the primary subscription license key.
Reading the sublicense properties on the product details page
Total number of licenses
The total number of concurrent users for the subscription.
The type of the sublicense: Primary (the main key which is split into sublicenses) or Reserved (sublicense with reserved number of licenses, taken from the main license pool).
The maximum number of concurrent users that can connect with the usage of the corresponding sublicense (it’s initially set at the time of sublicense creation and can be changed later).
The sublicense expiration date.