security label
A label attached to a resource (file, document, etc.) that indicates its security classification or access control attributes. Used in computing and information security.
This file has a security label assigned.
Access control is performed based on the security label.
Synonymous loanword from English; 安全保護ラベル is a more Japanese-native compound but less common in modern IT parlance.
message security labelling
Compound of 安全 (safety), 保護 (protection), and ラベル (label). A technical term likely calqued from English 'security label'.