PII is information that can be tied back to a specific individual. In AI systems it shows up in three places: training data, prompts, and outputs. Each requires its own controls.
Common patterns: detect-and-redact PII before sending to a third-party model, use enterprise tiers that contractually exclude your data from training, log redacted versions of prompts (not raw), and surface PII detection events to a security review queue. Regulations like GDPR and HIPAA make PII handling a compliance issue, not just a best practice.
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