Law firm compliance: GDPR, professional secrecy & AI Act

Why the 'Lawyers' sector is concerned

By its very nature, the legal profession handles sensitive data: health information, criminal records, family circumstances, and financial assets. Professional secrecy, the cornerstone of the profession, operates alongside GDPR: both protect confidentiality, but GDPR adds formal obligations (client information consistent with secrecy requirements, security, retention periods, and subcontracting).

The security and hosting of case file data are critical: use of supervised service providers (hosting, business tools), protection against data leaks, and vigilance over dematerialised exchanges.

Legal AI tools (research, drafting, case-law analysis) generally fall under limited risk. High risk targets AI intended to assist a judicial authority; a judicial decision-support tool raises specific issues.

GDPR & professional secrecy

The firm acts as data controller for the data in its case files. GDPR articulates with professional secrecy: data subject information is provided in compliance with that secrecy, security must be strengthened, retention periods adapted to record-keeping obligations, and sub-processing (hosting, tools) properly governed.

File data is frequently sensitive, which raises the level of compliance requirements.

Key obligations

• The firm's processing register.
• Enhanced security of case file data.
• Information in compliance with professional secrecy.
• Oversight of service providers (hosting, business tools).

AI Act — legal AI

AI tools used by lawyers for research, drafting and analysis generally fall under limited risk. High risk targets AI intended to assist a judicial authority in interpreting facts and law. Vigilance focuses on reliability and on the confidentiality of case-file data fed into these tools.

Key obligations

• Classify AI uses (often limited risk).
• Supervising the reliability of outputs.
• Protecting the confidentiality of case file data.
• Transparency on AI usage.

Comparative overview of regulations

How these regulations interact

For lawyers, GDPR and professional secrecy converge: both protect confidentiality, with GDPR adding formal obligations (security, retention periods, subcontracting, records). Professional secrecy does not exempt from GDPR obligations; it reinforces them.

Legal AI introduces a new risk: injecting case file data into an external tool may conflict with professional secrecy and GDPR. Maintaining control over the confidentiality of transmitted data is therefore essential.

Application timeline

• 1GDPR. In force.
• 2AI Act. Progressive transparency; high risk reserved for assistance to judicial authorities.

Applicable penalties

GDPR fines of up to €20M or 4%, on top of profession-specific disciplinary sanctions in the event of a breach of confidentiality. A data leak from case files combines GDPR, disciplinary, and reputational risk.

Compliance roadmap

• 1Map. Inventory the firm's processing activities.
• 2Securing records. Strengthen security and hosting of sensitive data.
• 3Aligning GDPR and confidentiality. Adapt information handling to comply with professional secrecy.
• 4Frame legal AI. Protect the confidentiality of injected data and supervise outputs.
• 5Govern service providers. Sign DPAs with hosting providers and business software vendors.

How Data Comply One supports the sector

Data Comply One covers GDPR and AI Act on a single platform, with an outsourced DPO, and supports law firms on the GDPR / professional secrecy articulation and the controlled use of legal AI.

DCO offers tailored templates (practice register, vendor management framework, AI usage policy respecting professional secrecy).

Frequently asked questions