The license information of Asprova and Asprova NLS/DS is recorded in the protector. There are two types of protector, a USB protector, which is a hardware key, and an e-Protector, which is a software key.
License update (application of magic number) is required when updating the Asprova maintenance contract or adding modules or options.
There is also a Backup Version protector for emergencies when the protector fails.
For details, please refer to the following.