Trade Secrets

Smith v. Dravo: When Sale Talks Create a Duty of Confidence

The Seventh Circuit held that a would-be buyer who received a target's secret designs during acquisition negotiations and then built a competing product had breached a confidential relationship the law implied from the dealings themselves.

July 9, 2025
Two business representatives reviewing engineering blueprints across a conference table
Smith v. Dravo treated the disclosure of blueprints during purchase negotiations as creating an implied duty not to use them competitively. Shutterstock
Educational content, not legal advice. This article explains general legal concepts. It does not create an attorney–client relationship. For your specific situation, consult a licensed attorney.

In Smith v. Dravo Corp., 203 F.2d 369 (7th Cir. Apr. 10, 1953), the United States Court of Appeals for the Seventh Circuit answered a question that recurs in nearly every failed merger and abandoned acquisition: when a company opens its books and hands over its secret designs to a prospective buyer, and the buyer walks away and builds a competing product using what it learned, has the buyer done anything wrong? The district court had said no, reasoning that the disclosures came with no express promise of secrecy. Judge Walter Lindley, writing for the Seventh Circuit, reversed. A confidential relationship, he held, need not be spelled out in a contract; it can be implied from the circumstances of the disclosure itself. The decision remains a foundational statement of the “duty of confidence” branch of trade-secret misappropriation.

At a glance

  • Case: Smith v. Dravo Corp., 203 F.2d 369
  • Court: U.S. Court of Appeals for the Seventh Circuit
  • Author: Circuit Judge Walter C. Lindley
  • Decided: April 10, 1953
  • Posture: Appeal from a judgment for the defendant; the Seventh Circuit reversed and remanded
  • Jurisdiction and governing law: Diversity (plaintiffs from Wisconsin; defendant a Pennsylvania corporation); the court applied Pennsylvania law on trade-secret liability, guided by the Restatement (First) of Torts § 757
  • Holding: A confidential relationship sufficient to support a misappropriation claim may be implied from the parties’ conduct—here, the disclosure of secret designs during negotiations to sell the business—without any express promise of secrecy
  • Significance: A leading authority that the duty not to use or disclose another’s trade secret can arise implicitly from the context of the disclosure, especially in acquisition negotiations

The plaintiffs were connected to the business of Leathem D. Smith, who had developed a successful and valuable design for shipping freight containers, sold through the Safeway Container enterprise. After Smith’s death, those controlling the business sought to sell it. The Dravo Corporation, a Pennsylvania concern, expressed interest in buying. To let Dravo evaluate the acquisition, the sellers furnished it with a detailed package of confidential information about the container business—including patent applications, blueprints, and customer and cost data. Dravo studied the materials, then declined to buy. Shortly afterward, it began manufacturing freight containers that closely resembled Smith’s and incorporated his design features. The plaintiffs sued for misappropriation of their trade secrets.

The problem: no express promise

Dravo’s defense was straightforward and, under a narrow view of contract law, plausible. No one had asked Dravo to sign a nondisclosure agreement. No clause in any document forbade Dravo from using what it saw. The sellers had simply handed over the information, hoping to make a sale. If a duty of confidentiality must be created by an express promise, Dravo owed none, and was free to exploit publicly unprotected information as any competitor might.

The Seventh Circuit rejected the premise that confidentiality must be express. The controlling question, the court reasoned, was not whether Dravo had promised secrecy in so many words, but whether the parties’ dealings created a relationship in which the disclosure was understood to be for a limited purpose. The materials were not broadcast to the world; they were delivered to a single prospective purchaser, for the specific and limited end of appraising a possible acquisition. That context, the court held, carried with it an implied understanding that Dravo would not turn the disclosures to its own competitive advantage.

How a duty of confidence is implied

The opinion grounds itself in the Restatement (First) of Torts § 757, which imposes liability on one who uses or discloses another’s trade secret where the secret was disclosed to him in confidence. The doctrinal move in Dravo is to read “in confidence” functionally rather than formally. A confidence can be reposed without ceremony. When a business opens its proprietary designs to a counterparty for evaluation in a transaction, the surrounding circumstances—the limited audience, the limited purpose, the commercial expectations of both sides—supply the confidential character the Restatement requires.

The court drew support from the practical realities of dealmaking. Acquisitions cannot happen unless targets disclose; targets will not disclose if disclosure means forfeiture. To hold that a prospective buyer may freely exploit everything it learns during due diligence, absent a signed agreement, would make every sale negotiation a trap for the seller and would chill the very transactions the law should facilitate. Implying a duty of confidence from the negotiation context aligns the legal rule with the reasonable expectations of commercial parties. That the parties were also discussing a possible license or patent arrangement reinforced, rather than undercut, the conclusion: the disclosures were plainly made for transactional evaluation, not as a gift to a competitor.

Two features of the analysis deserve emphasis. First, the duty arises from the relationship, not from the secrecy of each datum considered in isolation; what matters is that the package of designs and data was confidential and was furnished for a constrained purpose. Second, the breach lies in the use—Dravo’s manufacture of competing containers embodying Smith’s features—not merely in the receipt of the information. Misappropriation by an implied-confidence theory thus turns on the defendant’s exploitation of what it was trusted to evaluate.

Use, not just acquisition

Dravo is a useful corrective to the intuition that misappropriation is fundamentally about how a defendant got a secret. Dravo obtained the designs entirely properly: they were handed over voluntarily. The wrong was in what Dravo did next. The case thus sits at the “acquisition/use/disclosure” core of misappropriation doctrine, illustrating that a defendant who lawfully receives a secret in confidence still misappropriates it by using it for an unauthorized purpose. The later Uniform Trade Secrets Act codified exactly this structure, defining misappropriation to include use or disclosure of a secret acquired “under circumstances giving rise to a duty to maintain its secrecy”—language that reads almost as a summary of Dravo.

Open questions

The decision establishes that confidentiality can be implied but does not exhaustively specify when. Several boundaries remain contested in its wake. How much “context” is enough—does any disclosure during negotiations carry an implied duty, or only disclosures of plainly proprietary material to a single, identified counterparty? What happens when the parties’ communications are ambiguous about purpose, or when some of the disclosed information was independently available? And how does the implied-confidence theory interact with a sophisticated counterparty’s failure to demand an NDA—does the availability of an express protection weaken the inference of an implied one? Modern transactional practice has largely answered the prudential version of these questions by making written confidentiality agreements ubiquitous, but Dravo still governs the cases where the paperwork is missing, incomplete, or predates the critical disclosure.

Implications

  • Disclosure for a limited purpose implies a limited license. Handing secret information to a counterparty for evaluation does not authorize competitive use; the law can imply a duty of confidence from the transaction itself.
  • A signed NDA is not a prerequisite to a misappropriation claim. While written agreements are strongly advisable, their absence is not fatal where the circumstances show the disclosure was confidential.
  • Misappropriation can lie in use, not just acquisition. A defendant who lawfully receives a secret may still be liable for exploiting it beyond the purpose for which it was shared.
  • Due-diligence disclosures are high-risk. Sellers should treat every data-room disclosure as a potential exposure and protect it contractually; buyers should assume that information received in negotiations may carry use restrictions even absent explicit terms.
  • The rule is now codified. The UTSA’s “duty to maintain secrecy” language tracks Dravo, so its reasoning remains directly applicable under modern statutes.

Frequently asked questions

Did Dravo steal or improperly obtain the designs? No. Dravo received the blueprints and data voluntarily, as part of legitimate acquisition negotiations. The misappropriation lay not in how Dravo acquired the information but in its subsequent use of that information to build competing containers, in breach of an implied duty of confidence.

Was there a written confidentiality agreement? No. The absence of an express promise of secrecy was the crux of Dravo’s defense. The Seventh Circuit held that a confidential relationship could be implied from the circumstances of the disclosure, so no signed agreement was required to support liability.

What is the practical lesson for companies exploring a sale or merger? Disclosures made to evaluate a transaction can carry implied use restrictions, but relying on implication is risky. Sellers should require a written nondisclosure and non-use agreement before opening a data room, and buyers should recognize that information received in diligence may not be free for competitive use.

Authorities and sources