With the Volume:CSVLK key, you can activate the specified editions of Windows 10.
The system activated with this key will be your personal KMS server.
KMS key server activation Volume:CSVLK is performed only by phone.
Confirmation ID (CID) will be dictated by the auto-informant.
Or you can easily get an individual Confirmation ID using the CIDMS utility (Get Web)
KMS server activation is permanent.
If you additionally install "Active Directory Domain Services", then you can activate client Win 10 with Volume:GVLK keys on many other computers.
P.S. Here's another similar key:
#6.934