By Pavel Kolmogorov, California Business Litigation Attorney (State Bar No. 321018). Founder of Kolmogorov Law, P.C., recognized in Chambers and Partners 2026 Spotlight Guide for Litigation: General Commercial in Orange County.

Trade secrets are among a company's most valuable assets—and among the most vulnerable. A 2026 report by the Commission on the Theft of American Intellectual Property estimated that trade secret misappropriation costs the U.S. economy between $225 billion and $600 billion annually. For California businesses, where non-compete agreements are unenforceable (Bus. & Prof. Code § 16600), trade secret protection is often the primary legal tool available to prevent departing employees and competitors from exploiting proprietary information.

This guide covers what qualifies as a trade secret under California law, how to protect trade secrets proactively, and how to pursue claims when misappropriation occurs.

What Qualifies as a Trade Secret in California?

California's trade secret law is codified in the California Uniform Trade Secrets Act (CUTSA), Cal. Civ. Code § 3426 et seq. Under CUTSA, a trade secret is information that derives independent economic value from not being generally known or readily ascertainable, and is subject to reasonable efforts to maintain its secrecy (§ 3426.1(d)).

Both elements must be satisfied. Information that has economic value but is not kept secret—or that is kept secret but has no competitive value—does not qualify.

Trade secrets can encompass a wide range of business information:

What Counts as “Misappropriation”?

Under CUTSA § 3426.1(b), misappropriation includes acquisition of a trade secret by someone who knows or should know it was obtained by improper means (theft, bribery, misrepresentation, breach of a duty to maintain secrecy, or espionage), disclosure or use of a trade secret without consent by someone who used improper means to acquire it, and disclosure or use by someone who knew or should have known the secret was derived from a person who owed a duty of secrecy.

Common scenarios in practice: A departing employee downloads customer lists, pricing data, or technical files to a personal device before leaving. A former employee joins a competitor and uses proprietary knowledge to solicit your clients. A vendor or business partner shares your confidential processes with a third party in violation of an NDA. A competitor hires your employees specifically to gain access to your proprietary methods.

The “Reasonable Efforts” Requirement: Where Most Claims Fail

The most litigated element in trade secret cases is whether the business took “reasonable efforts to maintain secrecy.” Courts do not require Fort Knox-level security, but they do expect meaningful, documented protective measures. If you cannot show that you treated the information as secret, a court will not treat it as one either.

Measures California courts have found to be “reasonable efforts” include written confidentiality and non-disclosure agreements (NDAs) with employees, contractors, and vendors; restricting access to trade secrets to employees who need the information for their job (the “need-to-know” principle); password-protecting electronic files and using role-based access controls; marking documents as “Confidential” or “Proprietary”; conducting exit interviews that remind departing employees of their confidentiality obligations; implementing employee handbooks that clearly define trade secrets and confidentiality policies; and using physical security measures (locked cabinets, restricted areas) for sensitive materials.

Measures that are NOT sufficient alone: A general statement in an employee handbook that “all company information is confidential” is typically too vague. Courts want to see specificity—that the company identified particular categories of information as trade secrets and took concrete steps to protect them.

Remedies for Trade Secret Misappropriation Under CUTSA

Injunctive Relief (§ 3426.2). The court can issue an injunction prohibiting the defendant from using or disclosing the trade secret. The injunction can last for as long as the trade secret retains value, plus an additional period to eliminate any unfair commercial advantage. In practice, emergency Temporary Restraining Orders (TROs) and Preliminary Injunctions are often critical—by the time a case reaches trial, the damage from ongoing use of the trade secret may be irreversible.

Compensatory Damages (§ 3426.3). Damages may include the plaintiff's actual losses caused by the misappropriation and the defendant's unjust enrichment that is not accounted for in the actual loss calculation. If neither actual loss nor unjust enrichment is provable, the court may award a reasonable royalty—what a willing buyer and seller would have agreed to for the use of the secret.

Exemplary (Punitive) Damages (§ 3426.3(c)). If the misappropriation was willful and malicious, the court may award exemplary damages up to twice the compensatory damages. This serves as both punishment and deterrent.

Attorney Fees (§ 3426.4). The court may award reasonable attorney fees to the prevailing party if the misappropriation claim was made in bad faith, a motion to terminate an injunction was made or resisted in bad faith, or the misappropriation was willful and malicious. This is a two-way provision—a bad faith trade secret claim can result in a fee award to the defendant.

Federal Option: The Defend Trade Secrets Act (DTSA)

Since 2016, trade secret owners also have the option of filing in federal court under the Defend Trade Secrets Act (18 U.S.C. § 1836 et seq.). The DTSA offers one tool CUTSA does not: an ex parte seizure order that allows federal law enforcement to seize misappropriated material without prior notice to the defendant (§ 1836(b)(2)). This is reserved for extraordinary circumstances where the defendant would destroy evidence if given advance notice. Filing under the DTSA also provides the strategic advantage of federal court procedures, which are often faster than California state courts for complex commercial cases.

DTSA Whistleblower Immunity Notice. Under 18 U.S.C. § 1833(b), employers must include a notice of whistleblower immunity in any NDA or confidentiality agreement. Failure to include this notice means the employer cannot recover exemplary damages or attorney fees against an employee in a trade secret action. If your NDAs do not include this provision, have them updated immediately.

Proactive Protection: Steps to Take Before a Problem Arises

1. Audit your trade secrets. Identify exactly what information qualifies as a trade secret. Create an internal register of trade secrets with descriptions, locations, and access controls.

2. Update your NDAs. Every employee, contractor, and vendor with access to proprietary information should have a current NDA that specifically identifies the categories of confidential information and includes the DTSA whistleblower immunity notice.

3. Implement technical controls. Use access logging, data loss prevention (DLP) software, and USB/download restrictions. If an employee's last act before resigning was downloading 10,000 files to a thumb drive, your IT logs will be the strongest evidence in the case.

4. Conduct exit procedures. When employees leave, conduct a documented exit interview that covers the return of company property and devices, a reminder of ongoing confidentiality obligations, collection of access credentials, and confirmation that no company data was retained.

5. Monitor for misuse. After a key employee departs, monitor for signs of misappropriation: sudden loss of customers to the competitor the employee joined, market appearance of products suspiciously similar to yours, or solicitation of your employees by the former employee.

Statute of Limitations

The statute of limitations for trade secret misappropriation under CUTSA is 3 years from the date the misappropriation is discovered or should have been discovered (Cal. Civ. Code § 3426.6). Continuing misappropriation constitutes a single claim, so the statute runs from the last act of misappropriation, not the first.

Frequently Asked Questions

Q: Can I sue a former employee who takes clients to a new job?

A: It depends. In California, employees are generally free to compete after leaving your company (Bus. & Prof. Code § 16600). However, if the employee uses your trade secret customer information—such as confidential pricing, purchasing patterns, or non-public contact lists—to solicit those clients, that may constitute trade secret misappropriation. The critical question is whether the employee used protected information or simply their own relationships and general industry knowledge.

Q: Are customer lists trade secrets?

A: They can be, but it depends on the specifics. A customer list that is easily compiled from public sources (like a Google search or industry directory) is unlikely to qualify. A list that includes non-public details such as pricing history, purchasing preferences, contract terms, and key decision-maker contacts—developed over years of business relationships—is much more likely to be protected.

Q: What if the employee signed a non-compete agreement?

A: Non-compete agreements are generally void and unenforceable in California (Bus. & Prof. Code § 16600). However, non-disclosure agreements (NDAs) and non-solicitation agreements that protect trade secrets are enforceable. The key is that the restriction must be tied to the protection of trade secrets, not merely to preventing competition.

Need help? Contact Kolmogorov Law, P.C. at (909) 235-6116 or visit the contact us page to schedule a consultation with our business litigation team in Irvine, California.