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Meta Privacy Aware Infrastructure (PAI)¶
Definition¶
Privacy Aware Infrastructure (PAI) is Meta's umbrella initiative to embed first-class privacy constructs directly into the company's software infrastructure, announced publicly in January 2024 and detailed technically in the August 2024 Meta Engineering post on purpose limitation. PAI's anchor technology is Policy Zones — an information flow control (IFC) mechanism that enforces privacy constraints on data in transit and at rest at runtime — plus the Policy Zone Manager (PZM) UX and automation suite that makes rollout tractable across Meta's polyglot, multi-thousand-engineer codebase.
Scope¶
From the 2024-08-31 post:
- Runtime enforcement primitive — IFC (Policy Zones) rather than point-checking or out-of-band audits.
- Integrated systems named: HHVM (function-based web/middle/backend), Presto (SQL interactive), Spark (batch).
- Host languages for PAI runtime libraries: Hack, C++, Python.
- Rollout UX: PZM — a four-step workflow (identify assets → discover flows → remediate violations → continuously enforce + monitor).
Seen in¶
- sources/2024-08-31-meta-enforces-purpose-limitation-via-privacy-aware-infrastructure — canonical wiki surfacing. "PAI offers efficient and reliable first-class privacy constructs embedded in Meta infrastructure to address complex privacy issues."
Related¶
- systems/meta-policy-zones — PAI's anchor IFC technology.
- systems/meta-policy-zone-manager — rollout UX tooling.
- systems/meta-data-classifier — ML-based auto-discovery of sensitive data assets, integrated with PZM Step 1.
- concepts/purpose-limitation — the privacy principle PAI currently enforces.
- concepts/information-flow-control — the classical primitive Policy Zones implements.
- companies/meta