noun
closed user group
A computing term for a restricted-access user group, typically in network or telecommunications contexts.
このサービスは閉域利用者グループ向けに提供されています。
This service is provided for closed user groups.
Compound of 閉域 (closed area/domain) + 利用者 (user) + グループ (group), likely a calque from English 'closed user group'.