Is it legal to sell your company's data to AI companies?

Short answer: yes, licensing data your company owns to AI companies is generally legal, provided you deal with personal data properly and don't breach any contracts. Most of the risk is concentrated in a few places. This guide covers each one, with a UK and EU focus.

This is general information, not legal advice.

1. Personal data and GDPR

Business systems are full of personal data: customer contacts, employee names, email threads, notes about individuals. Under UK and EU GDPR you can't simply sell this. The key distinction is:

• Anonymised data can no longer be linked to an individual by any means reasonably likely to be used. It isn't personal data, and GDPR doesn't apply to it.
• Pseudonymised data has identifiers replaced with codes but could be re-linked. It is still personal data, and selling it needs a lawful basis and safeguards.

For almost every company data sale, the goal is genuine anonymisation before anything reaches a buyer. See how to anonymise business data.

Special category data

Health, biometric, genetic and similar data have extra protections. Unless it's robustly anonymised, treat it as out of scope.

2. Contracts and confidentiality

The most overlooked risk. Before selling, check:

• Client contracts: confidentiality clauses, data-use limits and ownership of deliverables.
• NDAs with partners, suppliers and customers.
• Software terms: some SaaS terms limit how exported data can be used, and data you processed for a client may belong to them.
• Employment contracts and policies, if employee-generated content is included.

Data you processed as a processor on behalf of a client (for example a payroll bureau processing client payroll) generally isn't yours to sell.

3. Sector-specific rules

• Financial services: regulator confidentiality rules and client-money records.
• Legal: privilege and professional conduct rules on client confidentiality.
• Healthcare: patient confidentiality on top of GDPR.
• Semiconductors and advanced materials: export controls on some technical data.

4. Protect yourself in the licence

A well-drafted licence reduces your risk after the sale. Look for:

• A ban on re-identification and on combining the data to re-identify people.
• Use restricted to the stated purpose (for example AI training and evaluation).
• No onward sale or sublicensing without your consent.
• Security obligations and deletion at the end of the term.
• Warranties you give that are limited to what you can actually stand behind.

More in AI data licensing agreements.

A pre-sale legal checklist

1. List every data source and confirm your company owns or controls it.
2. Review key client contracts and NDAs for confidentiality and data-use limits.
3. Identify all personal data, including in free text and attachments.
4. Document your anonymisation approach and test for re-identification risk.
5. Check sector rules and export controls.
6. Record your lawful basis and assessment (a short legitimate interests assessment is common).
7. Negotiate a licence with clear use restrictions.