noun
closed user group service
A telecommunications or network service that restricts communication to a defined set of users. Technical term used in computing and networking contexts.
このシステムは閉域接続を利用して、許可された端末だけがアクセスできる。
This system uses a closed user group service so that only authorized terminals can access it.
Compound of 閉域 (closed area/domain) and 接続 (connection). The exact historical derivation is uncertain; the term is a modern technical coinage.