Your product uses one of the following types of licenses (some products allow you to choose more than one type). It is important that you are aware of which types of licenses your company has purchased and how they are consumed. This ensures that you do not run out of licenses. The license types are:
With XenDesktop 5 Service Pack 1 or later and XenApp 6.5 or later, the license server can assign licenses to a user or a device and monitor license consumption. When assigned to a user, the license allows access from an unlimited number of devices. When assigned to a device, the license allows access from the device by an unlimited number of users.
A licensed device requires a unique device ID and is authorized for use by any individuals to access instances of XenDesktop. Use this type of license for shared devices, such as classroom, hospital, or clinical workstations.
A licensed user requires a unique user ID, such as an Active Directory entry. When assigned to a user, the license allows the user to connect to their desktops and applications with multiple devices, such as desktop computer, laptop, netbook, smartphone, or thin client. A licensed user can connect to multiple instances of XenDesktop concurrently.
The license server determines how to minimize license consumption based on the users and devices connected. The license server optimizes every 5 seconds until there are 5000 uses on distinct pairs (user/device) checked out. At 5000 uses optimization occurs every 5 minutes, which might delay status information until the next optimization.
Examples of uses on pairs:
Optimization occurs every 5 seconds for 1-4999 uses and every 5 minutes for 5000 or more uses.
5000 users * 1 device each = 5000
5000 devices * 1 user each = 5000
2500 users * 2 devices each = 5000
When users or devices connect to an application or desktop, they consume a license for the 90 day license assignment period. The assignment period begins when a connection is made, is renewed to the full 90 days during the life of the connection, and expires (allowing reassignment) 90 days after the last connection terminates (logs off or disconnects). If you have to manually end a license assignment before the 90 day period elapses (for example, an employee consuming a User license leaves the company), use the udadmin command line tool.
Concurrent user licenses
This type of license is not tied to a specific user. When a user launches a product, the product requests the license and it is checked out to the specific computer or device that the user is using. When the user logs off or disconnects from the session, the license is checked back in and is available for another user. Using this logic, keep the following scenarios in mind:
Concurrent system licenses
This type of license is similar to a concurrent user license; however, it is tied to a system, not a specific computer or device that the user is using.
When a user boots a computer or device and a system is launched (for example, an operating system or a virtual machine instance), a license is requested and checked out to the computer or device. The license remains in a checked out state until the system is no longer running (the computer or device is powered off or the virtual machine instance is stopped). Unlike a concurrent user license, the concurrent system license is not affected by a user logging on or off from a session; it is tied to the system's power state (on or off).
Licenses are purchased on a per system basis; one license per running system is required.
Using this logic, keep the following scenarios in mind:
Named user licenses
When a product requests a license, it is checked out to the user until a preconfigured period of time expires. This type of check-out is not tied to a computer or device; once the license is checked out, the user can run multiple sessions on different computers without checking out more licenses.