What is the litigation takeaway from In re Mitsubishi Heavy Industries America, Inc.?

To successfully protect trade secrets or proprietary business information in discovery, you must do more than simply object; you must provide a detailed privilege log and formally request an in-camera inspection. Failing to provide the trial court with the specific documents for review waives your ability to seek mandamus relief, as the appellate court cannot find an abuse of discretion without a record of the specific evidence at issue.

What is the summary of In re Mitsubishi Heavy Industries America, Inc.?

In re Mitsubishi Heavy Industries America, Inc. involved a discovery dispute where a relator sought to shield alleged trade secrets from production. The Beaumont Court of Appeals analyzed the burden-shifting framework of Texas Rule of Evidence 507 and the procedural requirements of Rule of Civil Procedure 193.3, concluding that the relator provided only general categorical descriptions of documents rather than a specific privilege log. The court held that the relator's failure to affirmatively request an in-camera inspection prevented the trial court from making a reasoned determination on the privilege, thereby rendering the petition for mandamus relief premature.

What is the burden of proof for asserting a trade secret privilege in Texas discovery?

Under Texas Rule of Evidence 507, the party resisting discovery must first establish that the information qualifies as a trade secret. Once established, the burden shifts to the requesting party to demonstrate that the information is necessary for a fair adjudication of its claims, after which the court must weigh the need for the information against the potential harm of disclosure.

What procedure must a party follow to properly withhold privileged material under Texas Rule of Civil Procedure 193.3?

Per Texas Rule of Civil Procedure 193.3, a party must state in its discovery response that responsive material has been withheld, identify the specific request to which the material relates, and identify the privilege asserted. The requesting party may then serve a written request for a 'privilege log' that identifies the specific information and material withheld.

What types of information qualify as 'trade secrets' under Texas Civil Practice and Remedies Code Section 134A.002(6)?

Section 134A.002(6) defines a trade secret as information, including technical, financial, or engineering data like designs, supplier lists, and project specifications, that derives independent economic value from not being generally known and is subject to reasonable efforts to maintain its secrecy. Texas courts often require affidavit testimony to establish these elements when a party seeks a protective order.

What does a party have to show to prove discovery is 'necessary' to overcome a trade secret privilege in Texas?

To overcome the trade secret privilege, the requesting party must demonstrate that the information is necessary to the case and that its absence would impair the presentation of the claim such that an unjust result is a 'real, rather than a merely possible, threat.' This heightened burden ensures that trade secrets are not disclosed unless they are essential to a fair adjudication.

When can a party seek a writ of mandamus to challenge a discovery order involving trade secrets?

Mandamus relief is available in Texas when a trial court clearly abuses its discretion by erroneously ordering the disclosure of privileged information or trade secrets, as an ordinary appeal does not provide an adequate remedy once the confidential information has been disclosed. However, the request may be considered premature if the trial court has not yet definitively ordered the production of specific, identified privileged documents.

Is a Texas trial court required to perform an in-camera inspection before compelling the production of documents claimed to be privileged?

If a party asserting a privilege makes a prima facie showing of that privilege and tenders the documents to the trial court, the court must conduct an in-camera inspection of the documents before it can decide to compel their production. This is a mandatory step to ensure that privileged material is not improperly exposed to the factfinder or the opposing party.

In re Mitsubishi Heavy Industries America, Inc.

In re Mitsubishi Heavy Industries America, Inc., 09-26-00079-CV, February 20, 2026.

Synopsis

The Beaumont Court of Appeals denied a petition for writ of mandamus as premature because the relator failed to meet its evidentiary burden to establish that discovery documents warranted a protective order. The court held that a general affidavit listing categories of sensitive information is insufficient to preserve a claim of trade secret privilege when the relator fails to provide specific descriptions of the withheld documents or request an in-camera inspection.

Relevance to Family Law

In high-net-worth divorce litigation, the valuation of a closely held business often necessitates the production of sensitive proprietary data, including customer lists, profit margins, and software algorithms. Family law practitioners frequently rely on Rule 507 of the Texas Rules of Evidence to shield this data from a spouse who may be a business competitor or whose motives for disclosure are punitive. This case serves as a critical warning: the "trade secret" objection is not self-executing. If you do not follow the technical requirements of Rule 193.3 and affirmatively request an in-camera inspection, you may be compelled to produce your client’s most valuable intellectual property to the opposing party without any protective restrictions, and you will have no recourse in the court of appeals.

Case Summary

Fact Summary

The underlying litigation involved a personal injury suit where the plaintiffs, the Vazquezes, sought discovery of various documents from Mitsubishi Heavy Industries America, Inc. regarding the design and construction of an unloading rack. Mitsubishi resisted production, asserting that the requests sought confidential trade secrets and proprietary information. While Mitsubishi expressed a willingness to produce some documents, it conditioned that production on the entry of a specific protective order. The parties reached an impasse regarding the terms of that order, leading Mitsubishi to file a motion for a protective order. To support its motion, Mitsubishi submitted an affidavit from a corporate president who categorized the responsive materials into broad groups, such as engineering designs, project plans, and supplier lists. However, Mitsubishi did not identify the specific titles or nature of the documents being withheld and did not request that the trial court review the documents in camera. Following a non-evidentiary hearing, the trial court found that Mitsubishi failed to meet its burden and ordered the immediate production of the documents without any protective measures.

Issues Decided

The central issue was whether a trial court abuses its discretion by denying a motion for a protective order when the party asserting a trade secret privilege provides only a categorical description of the materials and fails to request an in-camera inspection of the specific documents at issue.

Rules Applied

The court applied Texas Rule of Evidence 507, which protects trade secrets if the allowance of the privilege will not tend to conceal fraud or otherwise work injustice. The court utilized the burden-shifting framework established in In re Continental Gen. Tire, Inc., which requires the resisting party to first establish that the information is a trade secret before the burden shifts to the requesting party to show that the information is necessary for a fair adjudication. Additionally, the court looked to Texas Rule of Civil Procedure 193.3, which outlines the procedure for withholding privileged information, requiring a party to state that responsive material is being withheld and to identify the specific privilege asserted. Finally, the court relied on the standard set in In re E.I. DuPont de Nemours & Co., which mandates an in-camera inspection once a party makes a prima facie showing of privilege and tenders the documents.

Application

The court’s analysis centered on the procedural failures of the relator at the trial level. While Mitsubishi provided an affidavit from an executive describing the general nature of its business and the broad categories of documents it wished to protect, it failed to provide a specific "privilege log" or description of the actual documents withheld as required by Rule 193.3. The court noted that the mandamus record was devoid of any specific titles or descriptions of the documents. More importantly, the court emphasized that Mitsubishi never asked the trial court to conduct an in-camera inspection. Because the trial court was never given the opportunity to review the specific documents to determine if they truly constituted trade secrets, the relator could not demonstrate that the trial court's denial was arbitrary or unreasonable. The court reasoned that a prima facie showing of privilege, which triggers the duty for an in-camera inspection, requires more than just general assertions; it requires a nexus between the specific documents and the privilege claimed.

Holding

The Court of Appeals held that mandamus relief was premature because the relator failed to establish its entitlement to a protective order through the proper procedural channels. The court determined that without a request for an in-camera inspection or a specific identification of the documents, the trial court did not abuse its discretion in finding that the relator failed to meet its burden of proof. The court further held that the mere submission of a proposed protective order and a categorical affidavit is insufficient to preserve a trade secret claim for appellate review. Because the relator did not tender the documents or move for an inspection, the appellate court had no basis to conclude that the trial court's order compelling production was a clear abuse of discretion.

Practical Application

For the family law litigator, this case reinforces the necessity of technical precision during the discovery phase of a property division. When a business-owner client is served with a request for production that touches on "secret sauce" business information, counsel must do more than simply object. You must serve a response that complies with Rule 193.3, and if the opposition moves to compel or if you move for a protective order, you must be prepared to tender the specific documents to the court in a sealed envelope. Relying on an affidavit that describes "categories" of documents is a high-risk strategy that likely fails the Continental General Tire test. This case also suggests that the lack of a court reporter at the hearing (as noted in the opinion’s footnotes) can be fatal to a mandamus petition, as the appellate court cannot determine what evidence or arguments were presented.

Checklists

Preserving Trade Secret Protection in Business Valuations

Comply with Rule 193.3:
- State specifically that responsive information is being withheld.
- Identify the request to which the information relates.
- Explicitly assert the "Trade Secret Privilege" under TRE 507.
Prepare the Evidentiary Record:
- Draft an affidavit that goes beyond "categories"; link the specific harm of disclosure to the specific types of documents in the case.
- Draft a privilege log that identifies each document by title, date, and author.
The "Must-Haves" for the Hearing:
- Bring a physical or digital copy of the withheld documents in a sealed envelope for the judge.
- Make a formal, on-the-record request for an in-camera inspection.
- Ensure a court reporter is present to transcribe the arguments and any evidentiary offerings.
- If the court denies the protective order, request a stay of the production deadline to allow for the filing of a petition for writ of mandamus.

Avoiding Premature Mandamus

Check the Record for Completeness:
- Confirm the record contains the specific descriptions of the documents withheld.
- Ensure the record reflects a clear request for an in-camera inspection that was either ignored or denied.
- Verify that the "necessity" prong of the trade secret test was argued and that the burden was properly shifted to the requesting party.

Citation

In re Mitsubishi Heavy Industries America, Inc., No. 09-26-00079-CV (Tex. App.—Beaumont Feb. 20, 2026, orig. proceeding) (mem. op.).

Full Opinion

View Full Opinion Here

Family Law Crossover

This ruling can be weaponized in a Texas divorce when an business-owning spouse attempts to "hide the ball" by claiming that financial records or operational data are too sensitive to produce. If the owning spouse fails to provide a specific 193.3 identification or fails to request an in-camera inspection, the non-owning spouse can move to compel production, citing In re Mitsubishi for the proposition that the trial court must deny the privilege claim for failure to meet the procedural burden. Conversely, for the spouse protecting a business, this case is the roadmap: you cannot win on mandamus if you don't force the trial judge to look at the documents. In a custody context, this could also apply to sensitive psychological records or private business communications that a party claims are proprietary—procedural compliance is the only way to ensure the appellate court can protect those records from disclosure. ~~6337550b-1cc8-4b7a-99bb-4dcb41b19377~~