# Meta details PrivacyLib, a shared library enforcing privacy checks at data access

> Original title: PrivacyLib: Privacy Controls at the Data Access Boundary

- Source: Engineering at Meta
- Published: 2026-10-27T16:00:12.000Z
- Bad Influence: https://badinfluence.news/items/se75d6z643j91bo88oh11r0nb
- Original: https://engineering.fb.com/2026/10/27/security/privacylib/

## Summary

Meta says PrivacyLib is a common library running inside the clients of hundreds of its data and processing systems, so privacy requirements are implemented once as modules rather than separately in each system. The library performs billions of checks every second, and tool calls from internal AI agents on supported paths carry agent context to it. Meta describes the library as the final enforcement and monitoring stage of its Privacy Aware Infrastructure.