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SURF tracks several things while in use. The user actions in SURF, the SDU/CTRs opened, and the Detections hit on any files. All this data is hashed, encrypted in transit, and no Personal Identifiable Information (PII) is collected. Every user and SDU/CTR is given a unique hash and that is the only data transmitted to Sophos.

However, for Sophos TSEs, your internal username is transmitted with your telemetry data for KPIs.