Audit log immutability SHALL be enforced through cryptographic or append-only storage mechanisms.

Evaluation methodology as specified by the assigned method code.

This is a conditional control. Non-compliance with this ACR may result in conditional certification with a mandated remediation period. The Authorized Verification Body will specify the remediation timeline and required evidence for the condition to be cleared. If remediation is not completed within the specified period, the conditional certification will be revoked.