Identifying Trade Secrets With Reasonable Particularity (CCP 2019.210)

Last updated: November 2026

Code of Civil Procedure section 2019.210 requires a plaintiff suing for trade secret misappropriation under California's Uniform Trade Secrets Act to identify the trade secret with reasonable particularity before commencing discovery relating to it. (Code Civ. Proc., § 2019.210.) The identification is served early, usually under a protective order, and a dispute over its adequacy is often the first contested motion in the case. Kolmogorov Law, P.C. prepares and challenges these statements in trade secret cases in Orange County, Los Angeles, and across California.

Call (909) 235-6116 or contact us online to discuss a trade secret identification you need to serve or want to challenge.

What the statute says

The text is one sentence. In any action alleging misappropriation under the Uniform Trade Secrets Act, the party alleging it shall identify the trade secret with reasonable particularity before commencing discovery relating to the trade secret. The identification is subject to any orders that may be appropriate under Civil Code section 3426.5. (Code Civ. Proc., § 2019.210.)

Three things follow from that sentence. The obligation belongs to the party alleging misappropriation, which can be a cross-complainant as easily as a plaintiff. It is triggered before discovery relating to the trade secret, so discovery on unrelated claims may proceed. And the identification is made subject to the court's power to protect the secret during litigation by protective orders, in camera hearings, and sealing. (Civ. Code, § 3426.5.)

Why the rule exists

The Court of Appeal has described four purposes. The rule promotes well-investigated claims and discourages meritless ones. It prevents a plaintiff from using discovery to learn the defendant's trade secrets. It helps the court frame the scope of discovery. And it lets the defendant form a complete defense without waiting until the eve of trial. (Brescia v. Angelin (2009) 172 Cal.App.4th 133, 144-145.)

In my experience the second purpose is the one that drives most disputes. A competitor who sues on a vague theory of "confidential business information" and then demands the defendant's engineering files is doing something the statute was written to stop.

What reasonable particularity means

The standard is flexible. The plaintiff does not have to define every minute detail of the secret at the outset, and the court does not hold a miniature trial on the merits before discovery begins. The plaintiff must make a showing that is reasonable under the circumstances, one that lets the court control the scope of discovery, protects both sides' proprietary information, and gives each side a fair chance to prepare its case. (Brescia v. Angelin, supra, 172 Cal.App.4th at pp. 145-146.)

The required detail varies with the subject. Where the claimed secrets are incremental advances in a specialized technical field, a more exacting level of particularity may be needed to separate them from what skilled people already know. (Brescia, supra, 172 Cal.App.4th at pp. 145-146.) But the plaintiff is not required in every case to explain how the secret differs from the prior art. That explanation is required only when the details alone are not enough for the defendant to discern the boundaries of the secret or for the court to shape discovery. Doubts about adequacy are resolved in favor of letting discovery go forward. (Brescia, supra, 172 Cal.App.4th at p. 143.)

So a statement listing "customer information, pricing, and business methods" fails. A statement identifying the specific customer database, the fields it contains, the pricing model for a named product line, and the particular process steps at issue usually passes. The question of whether those things are actually trade secrets is for later; our page on what counts as a trade secret covers that.

How the dispute plays out

The plaintiff serves the identification, often as a separately captioned "trade secret statement" designated confidential under a stipulated protective order. The defendant objects that it is too general. The parties meet and confer. If they cannot agree, the defendant moves for a protective order staying trade secret discovery, or the plaintiff moves to compel.

The ruling usually results in an amended statement rather than a dismissal. But a plaintiff who cannot identify a secret after several attempts has a problem that goes beyond discovery, and the inability becomes an argument for summary judgment and for a bad faith fee award. (Civ. Code, § 3426.4.) For the accused, this is the first place to test whether there is any secret in the case. Our page for someone accused of taking company data explains the defense side.

Federal court and the DTSA

Section 2019.210 is a California procedural statute, and federal courts in California are divided on whether it applies to claims under the federal Defend Trade Secrets Act or to CUTSA claims heard in federal court. Many federal judges require an early identification anyway through case management orders, so a plaintiff choosing between forums should assume some version of the requirement will apply. Our page on DTSA and CUTSA claims compared covers the forum decision.

Drafting a statement that survives

A few habits make the difference. Describe each claimed secret separately and number them. Use the categories in the statutory definition (formula, compilation, process, and so on) and then say what the specific item is. Avoid "including but not limited to" and similar hedges; courts read them as an attempt to reserve the right to expand the case later. Identify a document or database by name, date, and fields; for a process, list the claimed steps and parameters rather than the general technique.

For the defense, the objection should be concrete. Explain what you cannot tell from the statement: which customers, which version of the code, which parameters. A generic objection that the statement is "vague" gets the same treatment as a generic statement.

What to bring to the first meeting

If you are the plaintiff, bring the documents that embody the secret, a plain-language description of what makes it valuable and not generally known, and the agreements and access controls that protected it. If you are the defendant, bring the complaint, the trade secret statement if one has been served, and your own account of what you know and how you learned it.

Frequently asked questions

What is CCP 2019.210?

A California procedural statute requiring a party alleging trade secret misappropriation under the Uniform Trade Secrets Act to identify the trade secret with reasonable particularity before commencing discovery relating to it. (Code Civ. Proc., § 2019.210.) The identification is served subject to protective orders that keep the secret confidential during the case.

What does "reasonable particularity" require?

A description detailed enough to let the court control the scope of discovery and let the defendant understand the boundaries of the claimed secret and prepare defenses. It does not require every minute detail or a pretrial ruling on whether the information is actually secret. (Brescia v. Angelin (2009) 172 Cal.App.4th 133, 145-146.) Technical secrets in crowded fields may need more detail.

Does the plaintiff have to explain how the secret differs from public information?

Not in every case. The explanation is required only when the details of the identification are not enough on their own to let the defendant discern the boundaries of the secret or let the court fashion discovery. (Brescia v. Angelin (2009) 172 Cal.App.4th 133, 143.) Doubts are resolved in favor of allowing discovery.

Does section 2019.210 apply in federal court?

Federal courts in California are split. Some apply it to CUTSA claims in federal court; others treat it as a state procedural rule that does not govern federal discovery. Expect some form of early identification in either forum.

What happens if the trade secret statement is inadequate?

The court typically stays discovery relating to the trade secret until an amended statement is served. Repeated failure to identify a secret supports summary judgment and can support a finding that the claim was brought in bad faith, which exposes the plaintiff to the defendant's attorney fees. (Civ. Code, § 3426.4.)

Talk to a California trade secret attorney

If you need to prepare or challenge a trade secret identification, call (909) 235-6116 or contact us online. Kolmogorov Law, P.C. is at 327 Magnet, Irvine, CA 92618, and litigates trade secret cases in Orange County, Los Angeles, and throughout California. See also our trade secret attorney page and our misappropriation guide.

This page provides general information about California law and is not legal advice. Outcomes depend on the information claimed, the quality of the identification, and the court.