The Compliance Catch with Cloud DLP
Most DLP (Data Loss Prevention) solutions — Nightfall, Cloudflare AI Gateway, Forcepoint — are cloud-based. Your prompts go to their servers for scanning. That's the fundamental problem for CMMC.
Under NIST 800-171 and CMMC Level 2, CUI must stay within your organizational control boundary. Sending CUI to a third-party cloud scanner — even for security purposes — creates a new data exposure risk that auditors will flag.
Comparison: HoundShield vs Alternatives
| Feature | HoundShield | Nightfall | Cloudflare AI GW |
|---|---|---|---|
| Deployment | Local-only ✅ | Cloud ❌ | Cloud ❌ |
| CMMC Compliant for CUI | Yes ✅ | No ❌ | No ❌ |
| Price (monthly) | From $69/mo | ~$6,250/mo | Free (cloud) |
| C3PAO PDF Evidence | Yes ✅ | No | No |
| Setup time | <10 minutes | Weeks | Hours |
| NIST 800-171 Mapping | Built-in ✅ | Partial | None |
Why "Local-Only" Is the Only Defensible Architecture
When a C3PAO assessor asks "how do you prevent CUI from reaching unauthorized external services?", your answer must include evidence, not just policy documents. HoundShield generates tamper-evident PDF logs of every AI prompt scan — blocked, flagged, and clean — so you walk into your assessment with proof.