A physical hardware key used to unlock full paid features of Livestream Studio software on a Windows PC without requiring an active recurring subscription login.: Works exclusively with Windows computers. Must be plugged into a USB 2.0 port rather than a USB 3.0 port for proper functionality. The physical dongle must remain plugged into your computer at all times while running the software. One dongle provides a full license for a single computer. If you run Studio on multiple systems simultaneously, you need one dongle per system.