PyCon26: LLM Governance, Guardrails, and Presidio When the Guardrail Leaks PII (petrostechchronicles.com)

Part 1/7 of my PyCon Greece 2026 talk, From Prompt to Proof: a Presidio guardrail masked the ΑΦΜ(tax number in Greece) label but leaked the actual tax identifier to the LLM while returning HTTP 200.

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