It can be applied to web responses, email bodies and attachments, uploads, downloads, messaging, or other supported content at gateways, services, applications, and endpoints.
Decisions may use file type and structure, keywords, labels, malware scan results, data classification, reputation, or user and device context. Effective controls define the content and actions in scope, place enforcement where it has adequate visibility, and provide review paths for consequential decisions.
Key points
Policy designMatch rules and actions to data sensitivity, user role, destination, legal requirements, and business purpose instead of treating every content match alike.
Enforcement coverageCoordinate gateway, application, cloud-service, and endpoint controls so uploads, downloads, encrypted sessions, and unmanaged routes do not create unexplained gaps.
Privacy and resilienceMinimize inspected and retained data, restrict access to inspection records, use Transport Layer Security (TLS) interception only when justified after evaluating alternatives and its trust, privacy, and failure effects, and define fail-open or fail-closed behavior.
Important limitationClassification and detection produce false positives and false negatives; encryption, encoding, transformations, and unsupported protocols reduce visibility. Allowed content is not necessarily safe, and blocked content is not necessarily malicious.