A Key Management Service (KMS) host inside your firewall ensures that individual installation features keys never leave your network. Your servers only send a KMS request to your internal host, not Microsoft. The privacy statement notes that KMS activations transmit no personally identifiable information except a generic count of activated clients.
: A Globally Unique Identifier (GUID), your PC's manufacturer, BIOS name, revision date, and a hashed version of your hard drive's volume serial number. A Key Management Service (KMS) host inside your
may vary by language and region, they generally cover several core "privacy-impacting" features that users can configure during installation. Key Installation Features and Privacy your PC's manufacturer