Security Review: Letter to the CISO

A concise security overview detailing Arivu’s Microsoft 365–native deployment, in-tenant data processing, Entra ID–based access controls, and Purview-aligned governance. Explains how Arivu delivers legal AI without external data vaults, document migration, or parallel permission models.

Dear [CISO / Head of Information Security],

We are seeking your review and approval of Arivu, an AI solution designed for in-house legal teams that operates entirely within the organization’s existing Microsoft 365 tenant.

Arivu was architected specifically to meet enterprise security, governance, and data sovereignty requirements—without introducing new data stores, external vaults, or parallel permission models.

Below is a summary of how Arivu aligns with standard enterprise security expectations.

1. Data Residency & Sovereignty

  • No data leaves your Microsoft 365 tenant
  • Arivu does not ingest, copy, or export documents to third-party clouds
  • There is no external vector database or proprietary “vault”
  • All processing occurs within your tenant boundary

Your legal data remains under the same residency, retention, and compliance controls you already enforce today.

2. Identity, Access & Permissions

  • Arivu natively integrates with Microsoft Entra ID
  • All access is permission-aware and enforced at query time
  • If a user cannot access a document in SharePoint, Arivu cannot see or use it
  • No manual permission mapping or secondary RBAC layer is required

This ensures AI responses never expose information beyond a user’s existing access rights.

3. Governance & Compliance (Purview-Aligned)

  • Arivu inherits your existing Microsoft Purview policies, including:
    • Sensitivity labels
    • DLP policies
    • Retention rules
  • No separate governance framework or AI policy engine is introduced
  • Compliance posture remains consistent with current Microsoft controls

4. Security Architecture

  • Operates as a resident application within Microsoft 365
  • Uses Microsoft-native encryption and security controls
  • No custom authentication mechanisms
  • No persistent external indexing or shadow data stores

If your organization already trusts Microsoft 365 for legal data, Arivu does not expand your attack surface.

5. AI Safety & Risk Controls

  • Responses are grounded exclusively in:
    • Authorized internal SharePoint content
    • Public legal sources (e.g., court records) when explicitly requested
  • No model training occurs on customer data
  • No cross-tenant data exposure

Summary

Arivu is not a new data destination or shadow AI platform.
It is a capability layer that activates intelligence across content you already govern within Microsoft 365.

From a security and compliance perspective, approving Arivu is equivalent to approving a Microsoft-native application that inherits—not bypasses—your existing controls.

We are happy to support any additional security review, architecture discussion, or documentation you require.

Sincerely,
Arivu Legal

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