The Steinberg Key (USB-eLicenser) is a copy protection unit (sometimes called "dongle") which is needed to use Steinberg's software range. With the host applications Cubase 7, Nuendo 4 and WaveLab 8, the Steinberg Key (USB-eLicenser) is already included in the product package. For updates and upgrades, you may need to purchase a key yourself.
The Steinberg Key (USB-eLicenser) is also required to run Steinberg VST instruments, but is not included in the product boxes and must be purchased separately if no Steinberg Key (USB-eLicenser) is already present on the system.