Privilege, in a legal setting, is the protection that keeps confidential attorney-client communications and related case material from being disclosed without permission. For law firms, this can cover emails, draft filings, strategy notes, evidence reviews, and other documents tied to legal advice.
In cyber security, privilege matters because a breach can expose not just data, but legally sensitive data. Attackers often target document stores, email accounts, shared drives, and case management systems where privileged material is kept. Defenders must protect these assets with strong access controls, encryption, logging, and careful incident response. If privileged content is accessed during an intrusion, firms may need legal review before disclosure, because the handling of that material can affect client trust, regulatory duties, and court proceedings. In practice, privilege is both a legal concept and a security concern.