Are Confidentiality Agreements Enforceable? When Courts Enforce an NDA and When They Do Not

Are confidentiality agreements enforceable in the US?

Generally yes. An NDA is an ordinary contract, so a court will enforce it if it was validly formed and its terms are lawful and reasonable. A company that can show you agreed to keep defined information secret, that you disclosed or misused that information, and that it suffered harm as a result has a breach of contract claim. Many companies also have a parallel claim for trade secret misappropriation, which exists even without a contract.

Courts treat NDAs differently from non-competes for a simple reason. A non-compete stops you from working; a confidentiality agreement only stops you from using or sharing specific information. Because the burden on you is smaller, judges are more willing to enforce it. That is also why companies sometimes try to stretch confidentiality language until it does the work of a non-compete, which is where many enforceability fights happen.

What makes an NDA legally binding?

The basic requirements are the same as for any contract. There must be an agreement, usually shown by a signature or a clear electronic acceptance. There must be consideration, meaning each side gets something: access to information, a job, a business opportunity or payment. The terms must be definite enough that a court can tell what information is protected and what you promised to do with it. And the purpose must be lawful.

Consideration is the most common technical problem in employment NDAs signed after the job has started. States differ on whether continued employment alone is enough to support a new restrictive agreement signed mid-employment; some require something extra, such as a raise, a bonus or a promotion. For a pure confidentiality agreement this rarely decides a case, because courts can also protect trade secrets without a contract, but it can matter for any non-solicit or non-compete bundled into the same document.

When is a confidentiality agreement not enforceable?

Even a validly signed NDA can be unenforceable in part. The most common reasons are:

• The information is not confidential. Material that is public, that you already knew, that you developed independently or that you received lawfully from someone else is usually not protectable, and many courts read these exclusions in even when the NDA leaves them out.
• The definition is so broad it restrains trade. In Brown v. TGS Management Co. (2020) 57 Cal.App.5th 303, a California appeals court held that confidentiality provisions claiming essentially all information usable in the securities industry operated as a de facto non-compete and were void under Business and Professions Code section 16600.
• The term is unreasonable for the information. Some courts will not enforce a perpetual confidentiality duty over ordinary business information that has lost its value, while still protecting genuine trade secrets indefinitely.
• It blocks reports to government. Under 18 U.S.C. 1833(b) an individual is immune from trade secret liability for confidential disclosures to government officials or an attorney made solely to report or investigate a suspected violation of law, and SEC Rule 21F-17 bars enforcing a confidentiality agreement to stop someone communicating with SEC staff.
• It covers sexual harassment or assault disputes. The Speak Out Act of 2022 (42 U.S.C. 19401 to 19404) makes nondisclosure and non-disparagement clauses agreed before a dispute arises generally unenforceable in a later sexual assault or sexual harassment dispute.
• It suppresses protected workplace speech. The National Labor Relations Act protects most non-supervisory private-sector employees who discuss pay and working conditions, and several states, including California, limit confidentiality terms about unlawful acts in the workplace.

Do courts enforce NDAs with no end date?

Sometimes, and it depends on what is being protected. Trade secrets remain protectable for as long as they stay secret and valuable, so an indefinite duty to protect a real trade secret is generally fine. For ordinary confidential business information, such as last year's prices or a pitch deck, courts in some states have declined to enforce an obligation that never ends, reasoning that the information no longer needs protection. The safest drafting, for both sides, is a fixed term of two to five years for general information plus continuing protection for trade secrets.

What happens if you break an enforceable NDA?

The other side can sue for breach of contract and, if trade secrets are involved, for misappropriation under state trade secret law or the federal Defend Trade Secrets Act. Most states have adopted a version of the Uniform Trade Secrets Act; New York is a notable exception that relies on common law. The remedies available depend on the claim and the facts.

How do courts decide whether a clause is reasonable?

Where an NDA is challenged, judges usually ask whether the restriction protects a legitimate interest and is no broader than needed. They look at how the agreement defines confidential information, whether it includes the standard exclusions, how long the duty lasts, and whether the restriction leaves the person free to use general skills and knowledge. A definition tied to specific, non-public categories such as source code, customer lists, pricing models and unreleased product plans is far easier to enforce than one that covers "all information relating to the business".

What happens to an overbroad clause varies. Some courts strike only the unreasonable part, some narrow it, and some refuse to enforce the provision at all. You usually cannot predict which approach a court will take, which is why narrowing the language before you sign is more reliable than hoping a judge fixes it later.

Are NDAs enforceable against employees and contractors?

Yes, and employee and contractor NDAs are among the most frequently enforced. Two federal points are worth knowing. First, the whistleblower notice requirement in 18 U.S.C. 1833(b) applies to agreements with employees and to people working as contractors or consultants. If the notice is missing, the agreement is still enforceable, but the employer cannot recover exemplary damages or attorney fees under the Defend Trade Secrets Act against a person who did not receive it. Second, under 18 U.S.C. 1836, a DTSA claim generally must be brought within three years after the misappropriation is discovered, or should have been.

For employees, also check whether the confidentiality agreement includes non-compete or non-solicit terms. Those are judged under different, usually stricter, state rules, and a court may refuse to enforce them even while it enforces the confidentiality promise.

A worked example

Daniel, a sales engineer, signs a confidentiality agreement when he joins a software company. It protects "all information relating to the Company's business, whether or not marked", has no exclusions and no end date. Two years later he leaves for a company in a different software niche. His former employer sends a letter claiming his new role breaches the agreement because he "knows how the Company sells software". A court is unlikely to treat general sales skills and industry knowledge as confidential, and in California a definition that broad risks being treated as a void restraint on his work. But if Daniel had downloaded the customer list and pricing model before leaving, the same agreement, and trade secret law, would very likely be enforced against him. The line courts draw is between specific secret information and the general experience a person carries from job to job.

How can you make sure your NDA will hold up?

Whether you are signing or sending an NDA, the same drafting choices make it both fairer and more likely to be enforced. Our free one-way NDA template uses this structure.

For a short, mutual, standard NDA, many people sign after a careful read. If the NDA is long, one-sided, perpetual, bundled with restrictive covenants, or tied to a large deal or a settlement, have it reviewed. An automated review can flag the clauses courts are most likely to refuse to enforce, and the ones you should negotiate anyway, before you decide whether a lawyer is worth the cost. State rules on confidentiality in employment and settlements change often, so confirm the current position as of 2026 for your state.

• Define confidential information by category and require marking, or written confirmation of oral disclosures.
• Include the four standard exclusions and a carve-out for disclosures required by law, with notice.
• Set a fixed term for general information and continuing protection only for trade secrets.
• Include the 18 U.S.C. 1833(b) whistleblower notice and a clear statement that nothing prevents reports to government agencies.
• Keep non-solicit and non-compete promises out of the NDA, or at least clearly separated and reviewed under your state's rules.
• Use a liquidated damages figure only if it is a genuine estimate of likely loss.