US Trade Secret Protection: What Are the Key Points on 2026 DTSA Litigation, Requirements for Preliminary Injunctions, and Evidence Preservation? Evidence Preservation Often Determines the Outcome

In US trade secret enforcement, the outcome is often decided not at trial, but on two things: whether you can obtain a temporary restraining order (TRO/Preliminary Injunction) within a few days, and whether you can lock down the data before the other side destroys the evidence. In 2026, federal courts have become more sophisticated in applying the Defend Trade Secrets Act (DTSA). The threshold for ex parte temporary restraining orders remains high, but electronic evidence preservation orders are being issued with increasing speed. One wrong step, and you will spend the rest of the case plugging holes.

DTSA federal jurisdiction is not automatic; first consider the product-related threshold.

The DTSA codified the definition of a trade secret in 18 U.S.C. § 1839, requiring information to satisfy three elements at the same time: that it is not generally known to the public, that it has independent economic value, and that reasonable measures have been taken to maintain its secrecy. Many Chinese companies expanding overseas overlook the third element when filing suit for the first time: if employees did not sign confidentiality agreements upon departure, server permissions were not tiered, and the code repository had no access logs, the judge will directly find that you lacked reasonable measures to maintain secrecy, and any later discussion of misappropriation becomes meaningless. In practice, we generally recommend conducting an internal confidentiality system audit before filing suit and compiling access records, watermarks, and employee departure handover forms; these materials are far more useful at a preliminary injunction hearing than statements by counsel.

Among the four elements of a preliminary injunction, the hardest to satisfy is irreparable harm.

The Federal Circuit continues to use.eBay v. MercExchangeThe four-factor framework that follows: likelihood of success on the merits, irreparable harm, balance of hardships, and public interest. The DTSA expressly authorizes injunctive relief under 18 U.S.C. §1836(b)(3)(A), but courts' findings on "irreparable harm" have tightened noticeably since 2024. Simply saying "customers will be lost" is not enough; you need specific quantification: for example, the decline in gross margin for a particular product line, year-over-year changes in a customer's purchase volume, or the time gap between source code leakage and a competitor's product launch. A temporary restraining order (TRO) typically lasts 14 days and can be extended once; a preliminary injunction has no fixed duration, but is often scheduled within 30 to 60 days. In cases we have handled, the question judges ask most often is: "If I don't issue the injunction, how much will you lose next month?" If you can't answer that, you're basically hanging.

Evidence preservation: How are Rule 65 and Rule 34 of the Federal Rules of Civil Procedure used?

Rule 65 of the Federal Rules of Civil Procedure (FRCP) allows an ex parte TRO to be sought before notifying the opposing party, but you must explain in writing why notice should not be given and must provide security. What truly determines the outcome is evidence preservation. There are two practical paths: first, file an Ex Parte Motion for Expedited Discovery simultaneously with the complaint, requiring the opposing party to mirror servers and seal devices within 3 to 7 days; second, serve a document request under FRCP Rule 34, but this is too slow—by the time the other side responds, the data is long gone. In 2026, many federal district courts have begun accepting "electronic evidence preservation order" templates, requiring defendants to complete mirroring through a third-party forensic firm within 24 to 72 hours, with costs typically advanced by the applicant and ultimately borne by the losing party. This tactic is especially important for cross-border e-commerce, because much of the infringement evidence exists only in platform backends and cloud servers—wait a week and there is nothing left to verify.

The criminal track is not an alternative option; 18 U.S.C. §1832 can proceed in parallel.

Many people focus only on the civil side and overlook that the DTSA also amended the Economic Espionage Act. 18 U.S.C. § 1832 contains criminal provisions for trade secret theft committed with intent to benefit a foreign government or foreign instrumentality, punishable by up to 10 years in prison. Civil and criminal tracks can proceed in parallel. Once a criminal case is opened, the FBI’s evidence-gathering capabilities are unmatched by private litigation. But the criminal threshold is high: intent must be proven, and an ordinary employee moving jobs with source code usually does not meet it. We generally advise that only when the other party has government ties or the matter involves national defense or critical technology is it worth pursuing the criminal route; otherwise, concentrating resources on civil injunctions is more efficient. For related cross-border enforcement planning, refer to an overall overseas intellectual property strategy.

Whether confidentiality measures have been implemented determines whether you can get through the door of federal court.

The DTSA does not require trade secrets to be locked in a safe, but it does require measures to match the value of the information. Commonly available evidence includes: NDA execution rates, VPN and permission-level logs, code repository audit trails, exit interview records, and non-compete agreements (note that California and other states enforce non-competes extremely strictly). Conversely, if a company has not even set up post-departure automatic forwarding blocking for employee email, it is hard for a judge to believe you valued this information. In practice, we generally recommend that companies expanding overseas establish a separate confidentiality regime for their U.S. entity rather than directly applying domestic templates, because U.S. courts look at actual implementation records, not paper documents. When a multi-country arrangement is involved, one may combineUS and EU trademark and patent filing page.Conduct a unified review.

Interim Injunctions: Security and Counter-Security Risks—Don’t Just Look at the Odds of Winning.

Applying for a TRO requires posting security, the amount of which is set by the court, commonly ranging from $5,000 to $50,000, and potentially higher in complex cases. If you ultimately lose, the defendant can claim damages for a wrongful injunction—this is the counter-security risk. In 2026, several rulings pushed counter-security amounts into the six figures because the injunction took an entire product line off the market. So before filing, you need to do the math: does the market share protection gained from the injunction cover the potential damages? We generally advise clients to conduct a "injunction cost-benefit analysis" before applying, listing the possible counter-security exposure, and then deciding whether to pursue an ex parte TRO or instead seek a preliminary injunction after notice.

Pitfalls of Cross-Border Evidence Collection and the Hague Convention: Time Costs Must Be Calculated in Advance

If the evidence or witnesses are in China, a U.S. court order to take evidence cannot be enforced directly; it must proceed through the Hague Evidence Convention or China-U.S. judicial assistance channels, a process that usually takes 6 to 18 months. This time gap is enough to render a preliminary injunction meaningless. Workarounds include using the extraterritorial application provisions of the DTSA to obtain evidence concerning acts committed within the United States, or obtaining data through platforms, such as Amazon and Shopify back-end records, which usually respond relatively quickly. When third-country parties are involved, reference may be made to the coordination pathways for intellectual property legal services in other countries. Many clients encountering this for the first time assume that once they obtain a U.S. judgment, it can be enforced globally. In reality, cross-border enforcement is another hard battle.

Guangdong Zhiming Law Firm’s foreign-related intellectual property team has long handled trademark, patent, copyright, and trade secret litigation in the United States and the European Union. If you need to assess the feasibility of filing a DTSA lawsuit or develop a strategy for seeking a preliminary injunction, please call the hotline 0755-25986969 to schedule a consultation.

Disclaimer: This article provides only a general interpretation based on current U.S. federal law and published case law and does not constitute legal advice for any specific case. Trade secret cases depend heavily on factual details and the court with jurisdiction; before taking formal action, please retain an attorney licensed to practice in the United States to provide a case-specific opinion.