It sits between your users and your LLM (OpenAI/Anthropic) and strips out sensitive data before it leaves your server. The Tech (Zero AI Inference): Instead of asking an LLM "is this safe?", I use: 152 PII Types: My custom engine covers everything from US Social Security Numbers to Indian Aadhaar cards and HIPAA identifiers. Shannon Entropy: To detect high-entropy strings (API keys, passwords) that regex misses. Deterministic Rules: 100% consistency. No "maybe."