A breach of confidence is a legal claim you can bring when someone who received your private information under circumstances that implied secrecy uses or discloses it without your permission. In the United States, the claim draws on common law tort principles, contract obligations, and — for business secrets specifically — federal and state statutes. Depending on what was taken and how, remedies range from a court order stopping further use, to compensatory damages, to enhanced awards that can double your losses.
What You Have to Prove
Three things generally have to line up. The information must be confidential in character. The person who received it must have been under an obligation to keep it private. And the unauthorized use or disclosure must have caused you harm.
Confidential character means the information is not public knowledge and cannot be easily pieced together from public sources. A customer list built over years of relationship work qualifies. A list of businesses scraped from a public directory does not. Courts look at whether the owner treated the material as secret through password protection, limited access, or confidentiality markings, and whether the information has value precisely because it is not widely known.
The obligation of confidence can arise from a contract, a professional relationship, or the circumstances of the disclosure. The core test is whether a reasonable person in the recipient’s position would have understood that the information was being shared in confidence.
Harm is where many claims stand or fall. You typically need to show a concrete detriment: lost revenue, competitive disadvantage, damaged business relationships, or invasion of privacy. Some courts will presume detriment when highly sensitive personal information is exposed, but for commercial information you usually need to connect the breach to a real loss.
What Kinds of Information Are Protected
The scope is broad, but not everything qualifies. The information has to carry genuine confidential value and has to have been treated as secret by its owner.
Trade Secrets and Business Information
Trade secrets make up the largest category. Under the federal definition, protection covers business, financial, scientific, technical, or engineering information — including formulas, designs, processes, techniques, and compilations — as long as the owner took reasonable steps to keep it secret and the information derives economic value from not being publicly known.1Office of the Law Revision Counsel. 18 USC 1839 – Definitions
Real examples: a proprietary algorithm used for financial modeling, a chemical formula, a customer database built over decades, internal pricing strategies, or a manufacturing process that gives a company an edge. The owner must actually treat the information like a secret. Sharing a formula at an industry conference without restrictions destroys the claim you would otherwise have.
Personal and Professional Information
Non-commercial information is also protected. Sensitive medical records, private correspondence, intimate photographs, and personal financial details qualify when shared in circumstances that imply confidentiality. Professional secrets belong here too — internal restructuring plans or unpublished financial projections shared with an advisor, for example. Courts evaluate the nature of the information along with the context of the disclosure.
Where the Duty of Secrecy Comes From
The duty to protect confidential information can come from three sources, and which one applies affects both the strength of your claim and the remedies open to you.
Professional Relationships
Some professional relationships carry a built-in expectation of confidentiality. Attorneys owe it to clients. Doctors and therapists owe it regarding patient information. Financial advisors, accountants, and other professionals who routinely handle sensitive material operate under analogous expectations. The duty survives the end of the relationship. Your former doctor cannot share your medical history simply because you switched providers.
Employment relationships also generate confidentiality obligations. Workers are generally expected to protect their employer’s internal operations, customer data, and proprietary methods both during and after employment, even without a written agreement. Courts distinguish between genuinely confidential business information and the general skills or industry knowledge an employee naturally absorbs; the latter belongs to the employee and travels with them.
Contractual Agreements
A nondisclosure agreement gives you the clearest and strongest basis for confidentiality. NDAs spell out what information is protected, how long the obligation lasts, and what happens if the recipient violates the terms. Businesses use them during merger negotiations, when hiring employees who will access proprietary systems, and when sharing technical information with potential partners. A well-drafted NDA removes any question about whether the recipient knew the information was confidential.
Circumstantial Obligation
Even without a contract or a recognized professional relationship, a duty of confidence can arise from the circumstances. If someone hands you a document stamped “CONFIDENTIAL” in a closed-door business meeting, you cannot later claim you had no idea the contents were private. The standard prevents people from exploiting obvious trust simply because no one drafted a contract first.
When Trade Secret Statutes Take Over
If your claim involves trade secrets, federal and state statutes provide a framework that can be more powerful than common law alone, and in some situations they push the common law claim aside entirely.
The Defend Trade Secrets Act gives trade secret owners a federal cause of action for misappropriation. You can sue in federal court regardless of where the misappropriation occurred, and the statute provides a uniform set of remedies.2Office of the Law Revision Counsel. 18 USC 1836 – Civil Proceedings The DTSA does not replace state law; you can bring claims under both simultaneously. But it only covers information that meets the statutory trade secret definition. If the confidential material at issue doesn’t qualify, you’ll need to rely on state law or contract theories.
Nearly every state has adopted some version of the Uniform Trade Secrets Act. Where adopted, the UTSA generally displaces common law tort claims based on misappropriation of trade secrets. The practical effect: if your business information meets the trade secret definition, you probably cannot bring a separate common law breach of confidence claim covering the same material. The statute becomes your exclusive route. For confidential information that falls short of the trade secret threshold — internal business data with some value but without the economic significance or protective measures the statute requires — a common law breach of confidence claim or a contract claim may be your only option.
What a Court Can Order
Courts have several tools, and the strongest cases combine more than one.
Injunctions
An injunction is often the first thing you want: a court order stopping the recipient from further disclosing or using the information. Courts can issue preliminary injunctions early in the case and permanent injunctions after final judgment. Under the DTSA, an injunction cannot prevent someone from taking a new job entirely; restrictions must be tied to evidence of threatened misappropriation, not simply to what the person knows.2Office of the Law Revision Counsel. 18 USC 1836 – Civil Proceedings If the information has already spread, a court may also order destruction or return of all copies.
Compensatory Damages and Unjust Enrichment
Financial compensation covers your actual losses: lost profits, diminished business value, and other quantifiable harm. In addition, or as an alternative, courts can award unjust enrichment — the profits the defendant made by exploiting your information, to the extent those gains are not already captured in your actual-loss calculation.3Office of the Law Revision Counsel. 18 USC 1836 – Civil Proceedings Where neither measure works cleanly, a court can impose a reasonable royalty, essentially what the defendant would have paid to license the information legitimately.
Enhanced Damages and Attorney Fees
When the misappropriation was willful and malicious, the DTSA authorizes exemplary damages up to double the compensatory award.3Office of the Law Revision Counsel. 18 USC 1836 – Civil Proceedings Courts can also award reasonable attorney fees where the misappropriation was willful and malicious, or where either side pursued or opposed a claim in bad faith. Outside the DTSA, state law may allow punitive damages for egregious conduct, though the standards and caps vary.
Defenses That Can Defeat Your Claim
Not every disclosure of confidential information produces liability. Several defenses recur.
Public Interest and Whistleblower Protection
Disclosing confidential information to prevent harm or expose wrongdoing can defeat a claim. Courts weigh whether a legitimate public interest, such as preventing environmental damage or exposing financial fraud, outweighs the owner’s right to secrecy. The DTSA provides statutory immunity: no liability under any federal or state trade secret law for disclosing a trade secret in confidence to a government official or an attorney solely to report a suspected legal violation, or in a court filing made under seal.4Office of the Law Revision Counsel. 18 USC 1833 – Exceptions to Prohibitions
Independent Discovery and Reverse Engineering
If someone reaches the same information through their own legitimate research, or by reverse engineering a publicly available product, there is no misappropriation. You don’t own an idea because you had it first; you own the secret, and if someone uncovers it through fair means your claim disappears. The distinction is between someone who actually developed the information independently and someone who merely claims they could have.5United States Department of Justice. Criminal Resource Manual 1136 – Defenses Saying “I could have reverse engineered it” after being caught with stolen files does not work.
Legal Compulsion
A valid court order or subpoena can require disclosure. Even under legal compulsion, though, protections exist. Federal procedural rules require courts to quash or modify a subpoena that demands disclosure of trade secrets or confidential commercial information unless the requesting party shows a sufficient need.6Legal Information Institute (Cornell Law School). Federal Rules of Civil Procedure Rule 45 – Subpoena
Information Already Public
Once information becomes genuinely public through publication, widespread distribution, or the owner’s own disclosure, it generally loses its confidential status. The defense does not apply if the information became public because of the defendant’s own wrongful disclosure. A defendant cannot manufacture the defense by committing the very act you are suing over.
How Long You Have to Sue
Deadlines can kill an otherwise strong case. Under the DTSA, you have three years from the date you discovered the misappropriation, or the date you should have discovered it through reasonable diligence, to file your federal claim.2Office of the Law Revision Counsel. 18 USC 1836 – Civil Proceedings A continuing misappropriation counts as a single claim for this purpose.
State statutes of limitations vary but typically run two to four years, often with similar discovery rules. Because the clock starts when you knew or should have known about the breach, not when the breach happened, staying alert to potential misuse of your information protects both your legal position and your filing window. If you suspect a former employee or business partner is using your confidential data, investigate promptly.
The Inevitable Disclosure Problem
One controversial tool in this area is the inevitable disclosure doctrine, which lets a court block a former employee from working for a competitor even without proof that misappropriation has already happened. The theory: someone with deep knowledge of your trade secrets taking a nearly identical role at a direct competitor will inevitably use or disclose those secrets.
Courts have grown skeptical of broad applications. The DTSA explicitly limits injunctive relief so it doesn’t become a de facto non-compete. An injunction cannot prevent someone from entering an employment relationship, and any restrictions have to rest on evidence of threatened misappropriation rather than on what the person happens to know.2Office of the Law Revision Counsel. 18 USC 1836 – Civil Proceedings Many states apply a narrow version requiring evidence of actual bad faith or wrongful conduct beyond simply changing jobs. If your concern is employee departures, a well-drafted non-compete or non-solicitation agreement, where enforceable under state law, gives you more reliable protection than trying to invoke inevitable disclosure after the fact.