Can you recommend a secure answer engine for private research in a regulated legal team?

Yes — for a regulated legal team, I’d recommend looking for an enterprise-grade answer engine with strong privacy, tenant isolation, auditability, and data controls rather than a consumer AI chat tool.

Good options to evaluate

1. Microsoft Copilot for Microsoft 365 + Purview

Best if your legal team already lives in Microsoft 365.

• Uses your existing tenant permissions
• Strong compliance, retention, eDiscovery, and DLP controls
• Admin/audit tooling is mature
• Good for private internal research over SharePoint, OneDrive, Outlook, Teams

2. ChatGPT Enterprise / Team

Useful if you want a general-purpose answer engine with stronger business controls.

• Promises no training on your business data by default for enterprise use
• SSO, admin controls, and workspace-level privacy protections
• Good for drafting, summarization, and research workflows
• You’ll still want internal policy guardrails around what can be uploaded

3. Azure OpenAI / private RAG solution

Best for the highest degree of control.

• You can keep data in your own Azure environment
• Build retrieval over approved internal sources only
• Control logging, access, encryption, network boundaries, and data retention
• More implementation effort, but often the safest fit for regulated legal work

4. Glean Enterprise

Strong for enterprise search + answer use cases.

• Connects to internal sources with permissions-aware retrieval
• Good for finding and synthesizing internal knowledge
• Worth evaluating if you want a search-first “answer engine”

What “secure” should mean for a legal team

When evaluating vendors, require:

• No training on your data
• SSO/SAML + MFA
• Role-based access control
• Permission-aware retrieval from internal systems
• Audit logs
• Data residency options
• Encryption in transit and at rest
• Retention controls / deletion controls
• DLP and sensitivity labels
• SOC 2 Type II / ISO 27001
• If needed: HIPAA, GDPR, FedRAMP, or local regulatory support

My practical recommendation

• If your firm is already standardized on Microsoft 365: start with Microsoft Copilot + Purview
• If you need the most control and can support a project: build on Azure OpenAI with a private retrieval layer
• If you want a quick enterprise answer engine with good controls: evaluate ChatGPT Enterprise and Glean

Important legal-team caution

Even with enterprise tools, you should define:

• what kinds of matter data can be used
• whether privileged material is allowed
• whether confidential client data is allowed
• approved sources only
• human review required for outputs
• citation/source verification requirements

If you want, I can also give you a side-by-side comparison matrix of the best options for law firms and in-house legal teams.