A non-disclosure agreement, or NDA, is a legally binding contract that creates a confidential relationship between the people who sign it. One side, or both, agrees not to share specified sensitive information with anyone outside the agreement. You’ll run into NDAs most often when starting a new job, entering business negotiations, or settling a legal dispute. The document turns a verbal promise of secrecy into something a court can enforce, with real financial consequences if someone breaks it.
How an NDA Works
The deal is simple. One side gets access to valuable information, and in exchange, the other side promises to keep it confidential. That exchange of value is what contract law calls consideration, and it’s what makes the agreement enforceable. When you sign an NDA on your first day at a new job, the consideration is straightforward: you get the job, and the company gets your promise of secrecy. It gets murkier when an employer hands you an NDA years into your tenure, because a promise that you’ll keep the job you already have isn’t always enough to count as consideration in every jurisdiction.
Once signed, the agreement gives the information-sharing party legal standing to sue if the other side leaks protected details. Without a written contract, proving someone violated your confidence is far harder; you’d need to show an implied duty existed, which courts treat skeptically. The written agreement eliminates that ambiguity and spells out what’s off-limits, for how long, and what happens if someone breaks the rules.
Unilateral and Mutual NDAs
A unilateral NDA flows in one direction. One party shares sensitive information and the other agrees to keep it secret. This is the version most employees sign: the company discloses its trade secrets, and you promise not to share them. The company takes on no reciprocal duty to protect your information.
A mutual NDA binds both sides equally. Each party shares confidential information and each promises to protect what it receives. These show up in merger talks, joint ventures, and partnership negotiations where both companies need to open their books. The agreement typically defines each side as both a Disclosing Party and a Receiving Party, with the same confidentiality rules running in both directions.
Both types often extend the secrecy obligation beyond the people who actually sign. Lawyers, accountants, consultants, and affiliated companies that need access to the information are usually covered, which closes off leaks through secondary channels.
What Information an NDA Covers
NDAs most commonly protect trade secrets, meaning the proprietary information that gives a business its competitive edge. Under federal law, a trade secret includes any business, financial, scientific, or technical information that the owner has taken reasonable steps to keep secret and that derives economic value from not being publicly known.1Office of the Law Revision Counsel. 18 U.S. Code 1839 – Definitions That’s a wide net. It can cover manufacturing formulas, software code, customer lists, pricing strategies, and internal financial projections.
An NDA isn’t limited to trade secrets, though. It can cover almost any information the parties agree to keep confidential: business plans still in development, the terms of a pending settlement, unpublished research data, even the existence of the negotiations themselves. What matters most for enforceability is specificity. The agreement needs to define clearly what counts as confidential. Vague language like “all business information” invites a court to toss the agreement as overly broad. Well-drafted NDAs typically include a schedule or exhibit listing specific categories of protected information so the signer knows exactly what’s off-limits.
Standard Exclusions
Not everything can be locked behind an NDA. Certain categories of information are carved out of nearly every agreement, and without these exclusions, NDAs would be unreasonably restrictive.
- Information that’s already public, so long as it didn’t become public because the receiving party leaked it.
- Information the receiving party can show it already knew before signing.
- Information the receiving party develops independently, without using or referencing the confidential material.
- Information the receiving party legitimately gets from a third party who had no duty of secrecy.
A court is far more likely to enforce an agreement that acknowledges these standard carve-outs than one that tries to claim ownership over general industry knowledge or information already in the public domain.
How Long the Obligation Lasts
Every NDA has two time components. The contract term covers how long the parties will be actively sharing confidential information, often the length of an employment relationship or a specific project. The survival period is what matters more: it’s how long the secrecy obligation continues after the relationship or project ends. Most NDAs set survival periods between two and five years, depending on the industry and how sensitive the information is.
Trade secrets are the exception. Because a trade secret only retains its value as long as it stays secret, many NDAs impose indefinite confidentiality obligations for that category of information. The Defend Trade Secrets Act backs this up by giving trade secret owners a federal right to sue for misappropriation.2Office of the Law Revision Counsel. 18 U.S. Code 1836 – Civil Proceedings The practical effect is that your obligation to protect a genuine trade secret can outlast the NDA’s stated term by years.
What Happens If You Break It
Violating an NDA exposes you to several forms of legal liability at the same time. The injured party doesn’t have to pick one remedy.
Monetary Damages
The most direct consequence is a lawsuit for money. Compensatory damages aim to cover the direct financial harm caused by the leak: lost profits from a competitor gaining access to proprietary information, lost business deals, and the cost of investigating and containing the breach. Consequential damages reach further, covering foreseeable secondary harm like damaged client relationships or canceled contracts, though the injured party has to show those losses were a predictable result of the breach.
Many NDAs also include a liquidated damages clause, which sets a predetermined dollar amount owed if a breach occurs. These clauses spare the injured party from having to prove exact financial losses, but courts will only enforce them if the amount represents a reasonable estimate of potential harm rather than a penalty.
Injunctions
Money often can’t undo the damage from a confidentiality breach. Once a trade secret is out, it’s out. Courts can issue injunctions ordering the breaching party to stop disclosing the information immediately. The injured party typically has to show irreparable harm, meaning the kind of damage money alone can’t fix. NDAs routinely include a clause where the signer acknowledges in advance that a breach would cause irreparable injury, though courts in some jurisdictions still require independent proof.
Attorney Fees
Under the default rule in the United States, each side pays its own legal costs regardless of who wins. Many NDAs change that with a fee-shifting clause that forces the losing party to cover the winner’s attorney fees. If you breach an NDA with this provision and lose in court, you’re paying for both sides’ lawyers. Some agreements make the clause one-sided, allowing only the disclosing party to recover fees, though a handful of states automatically convert one-sided fee clauses into mutual ones.
When an NDA Will Not Hold Up
NDAs are not bulletproof. Federal law carves out several situations where confidentiality obligations simply cannot apply, and courts will refuse to enforce agreements that cross these lines regardless of what the contract says.
Whistleblower Protections
No NDA can stop you from reporting suspected illegal activity to the government. Under the Defend Trade Secrets Act, you have explicit immunity from civil and criminal liability for disclosing a trade secret to a government official or an attorney when the disclosure is made solely to report or investigate a suspected violation of law.3Office of the Law Revision Counsel. 18 U.S. Code 1833 – Exceptions to Prohibitions The same immunity applies when trade secrets are disclosed in a court filing made under seal.
The SEC takes this further for securities violations. Federal regulations make it illegal for any person to take any action to impede someone from communicating directly with SEC staff about a possible securities law violation, including enforcing or threatening to enforce a confidentiality agreement.4eCFR. 17 CFR 240.21F-17 – Staff Communications With Individuals Reporting Possible Securities Law Violations An NDA that requires you to get your employer’s permission before contacting regulators, or that forces you to waive whistleblower awards, is unenforceable and can trigger SEC enforcement action against the company.
Sexual Harassment and Assault
The Speak Out Act, which took effect in December 2022, makes predispute NDAs unenforceable when sexual harassment or sexual assault is alleged.5Office of the Law Revision Counsel. 42 U.S. Code 19401 – Speak Out Act The key word is predispute. If you signed an NDA before the harassment occurred, such as the standard confidentiality agreement in your employment contract, it cannot be used to silence you about what happened. NDAs signed after a dispute arises, such as a confidentiality clause in a settlement agreement, are treated differently and may still be enforceable.
Employee Rights Under the NLRA
The National Labor Relations Board ruled in its McLaren Macomb decision that employers violate the National Labor Relations Act by offering severance agreements with overly broad confidentiality or non-disparagement provisions that prevent employees from exercising their rights to discuss working conditions and organize with coworkers.6National Labor Relations Board. Board Rules That Employers May Not Offer Severance Agreements Requiring Employees to Broadly Waive Labor Law Rights Simply offering such an agreement is itself a violation, even if the employee never signs it. This ruling primarily protects non-supervisory, non-managerial employees covered by the NLRA.
Overbreadth and Other Defects
Even outside those federal protections, courts regularly strike down NDAs that are unreasonably broad. Common reasons an agreement fails include language so vague it sweeps in virtually all information rather than specific categories, no defined time limit on the secrecy obligation, attempts to protect information that was never actually confidential, and provisions that require illegal conduct such as concealing regulatory violations. If an NDA is drafted to muzzle you rather than protect legitimate business secrets, it’s vulnerable to challenge.
What to Check Before Signing
Most people encounter an NDA as a take-it-or-leave-it document handed over with a stack of employment paperwork. That doesn’t mean you should sign without reading it. A few things are worth checking closely.
Start with how the agreement defines confidential information. A well-drafted NDA identifies specific categories: customer databases, product development timelines, financial records. A poorly drafted one says something like “all information related to the company’s business,” which could cover everything you learn during your employment down to the office coffee brand. The broader the definition, the harder it is to know what you’re actually agreeing to.
Check the survival period next. A two-year obligation after you leave a job is common and generally reasonable. An indefinite obligation covering all information, not just trade secrets, is aggressive and potentially unenforceable, but challenging it means going to court, which costs time and money.
Look for a liquidated damages clause and understand the dollar amount you’d owe for a breach. Look for fee-shifting provisions that could put you on the hook for the company’s legal costs. Confirm that the agreement includes the standard exclusions for public information, prior knowledge, and independent discovery. If those carve-outs are missing, the agreement is overreaching.
Having an attorney review an NDA before you sign it typically costs a few hundred dollars. That’s a small price next to the potential liability you’re accepting, especially if the agreement covers high-value trade secrets or includes steep liquidated damages.