IGEL thin clients from the Universal Desktop product range (e.g. UD5) are supplied with an installed license. This license enables you to use various firmware functions and is linked to the MAC address of the thin client. Manually created thin clients or hardware from other manufacturers "converted" using the UDC may not have a license. The license must therefore be added to the firmware later on. Upgrade licenses too can be rolled out later on using the UMS license management system.