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Can a law firm license its data to AI labs?

By Marin Data team · Updated 2026-10-19

A law firm can license some of its records, but client matter files carry duties that most companies do not have. ABA Model Rule 1.6 protects all information relating to a representation. The ABA has read that broadly, including information already in a public record. In practice, a firm can license its own operational records more easily than its clients’ files, and client files generally need each client’s informed consent. This guide explains the rules and what buyers accept. If you want to know whether your firm’s records are worth the effort, get a confidential estimate.

This is general information about the ABA Model Rules and published buyer terms. It is not legal advice, and it is not an ethics opinion. Your state’s rules of professional conduct govern, and some differ from the Model Rules. Consult your state bar’s ethics counsel or your firm’s general counsel.

What does Rule 1.6 say?

ABA Model Rule 1.6(a) says a lawyer “shall not reveal information relating to the representation of a client unless the client gives informed consent, the disclosure is impliedly authorized in order to carry out the representation or the disclosure is permitted by paragraph (b).” Rule 1.6(c) adds a duty to make reasonable efforts to prevent unauthorized disclosure of that information.

Licensing matter files to an AI buyer is not impliedly authorized to carry out a representation, and none of the paragraph (b) exceptions is written for it. That leaves informed consent. Accounting firms face a similar consent rule for tax files under IRC section 7216, covered in can an accounting firm sell its data to AI labs?

What does ABA Formal Opinion 480 add?

Formal Opinion 480, issued Mar 6, 2018, dealt with lawyers’ blogs and public commentary. Its reasoning reaches further. It holds that information relating to a representation stays protected by Rule 1.6(a) even when it appears in a public record such as a court filing. Commentators have read it to make even a client’s identity confidential in many cases (Holland & Knight, Mar 2018).

For data licensing, this matters in two ways. “It’s already public” is not a defence for licensing filed pleadings from a matter. And de-identifying a file does not obviously take it outside the rule, because the duty attaches to the information and not only to the names.

What does ABA Formal Opinion 512 add?

Formal Opinion 512, issued Jul 29, 2024, covers lawyers’ use of generative AI tools. It says that before entering information relating to a representation into a self-learning AI tool, a lawyer needs the client’s informed consent. Commentators note it treats boilerplate consent in an engagement letter as insufficient (Minnesota Lawyer, Aug 21, 2024).

Licensing records for AI training goes further than using a tool. If informed consent is needed for a lawyer’s own prompt, it is hard to see a lower bar for licensing a matter file to a training-data buyer.

What about privilege?

Frankfurt Kurnit Klein & Selz warns that a sale of company data may waive privilege over legal communications and weaken trade-secret protection (FKKS, Oct 1, 2026). For a law firm, the privilege belongs to the client. A waiver would harm the client, which is one more reason consent comes first.

So what could a law firm license?

Think in three groups.

Client matter files are the hardest

Pleadings, correspondence, drafts, discovery and deal documents. These need each client’s informed consent at a minimum. A firm with institutional clients may find some willing to consent for a share of proceeds or for a specific, limited use. Expect most to decline.

Firm work product needs case-by-case review

Internal templates, checklists, practice guides and training materials written by the firm’s lawyers. Many templates began as client documents, so each needs review before it goes anywhere.

Firm operations are the simplest

Intake workflows, conflicts-check processes, matter management, billing operations and staffing patterns, with client information removed. Buyers want records of how work is done. A firm’s operations are that record, even without client content. Billing data still contains client information and needs the same care.

Which buyers accept law firms?

  • Mode accepts law firms from 6 employees, against 30 for most businesses (Mode, observed Oct 16, 2026). Mode buys email, documents, chat, calls, CRM and billing data. It markets the program to law firms as BizBuyData, which Above the Law covered on Oct 16, 2026. Mode told the site its tools remove names and other identifying details. Removing names does not replace the client-consent step described above, and privileged material still stays out.
  • Mercor lists legal among the industries it buys from (Mercor, observed Oct 16, 2026).
  • Turing lists legal and contracts among the areas Project Lazarus buys (Turing, observed Oct 16, 2026).

Most other programs set floors of 20 to 40 employees. micro1 asks for 30+ (micro1), and Scale AI prefers 40+ (Scale). A 10-person firm has few direct routes outside Mode.

A sequence that keeps the firm safe

  1. Decide what you are considering: operations only, firm-authored work product, or client files.
  2. Have the firm’s ethics counsel review it against your state’s Rule 1.6 and any state opinions on AI.
  3. For client files, draft a specific consent letter: what records, which buyer, what use, what de-identification, what deletion. Get it signed per client.
  4. Exclude anything under protective order, court seal or a client’s outside counsel guidelines that bar it.
  5. Ask the buyer to de-identify inside your environment, and review a sample before signing.
  6. Put field of use, no re-identification and deletion into the license.

Marin Data does not give legal or ethics advice. We help firms work out what is worth licensing and to whom, and we tell you where counsel is needed. It costs the firm nothing.

Get a confidential estimate.

Sources

Common questions

Does Rule 1.6 stop a law firm from licensing its files?

ABA Model Rule 1.6(a) bars a lawyer from revealing information relating to the representation of a client without the client's informed consent, implied authorization or an exception. Matter files are that information, so licensing them generally requires each client's informed consent. Check your state's version of the rule.

If the files are de-identified, is that enough?

Not on its own. ABA Formal Opinion 480 (Mar 6, 2018) treats information relating to a representation as protected even when it appears in a public record. Removing names may not remove the duty, and your state bar may take its own view.

Which buyers accept small law firms?

Mode accepts law firms from 6 employees, against 30 for most businesses (Mode, observed Oct 16, 2026). Mercor lists legal among its industries, and Turing lists legal and contracts among the areas it buys.

Could licensing waive privilege?

It could. Frankfurt Kurnit Klein & Selz warns that a sale of company data may waive privilege over legal communications (Oct 1, 2026). For a law firm, that risk falls on clients, which is why their consent matters.

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