TESSY is available with a node-locked license or with a floating license.
The node-locked license restricts the use of TESSY to the PC the license is issued for. The node-locked license is not transferable to another PC. It is not a dongle license.
One or more floating licenses are administrated by a Floating License Server (FLS). At the same time, you may use TESSY as many times as the amount of licenses the FLS disposes over.