I assume, everyone has faced challenges understanding XenDesktop licensing. It is a bit tricky, especially considering all the components available with XenDesktop Platinum. Some of them are licensed with Citrix License server, some of them have individual licensing. In addition, there are also some regulations through the End User License Agreement (EULA).
More importantly, understanding how a Citrix License server failure or connection loss affects the components is always good to know in order to consider this as part of a XenDesktop implementation.
The recently published whitepaper “Citrix XenDesktop Licensing Explained” provides insights into this and should help to license your XenDesktop implementation appropriately.