A non-disclosure agreement, or NDA, is a legally binding contract in which one or both parties agree not to share specified confidential information with anyone outside the agreement. Businesses use NDAs to protect trade secrets, customer data, financial strategies, and other proprietary information, and the same contract shows up in job offers, freelance engagements, merger talks, and investor pitches. Done well, an NDA gives the disclosing party real legal tools when a secret leaks. Done poorly, it can leave valuable information unprotected or trip the drafter into regulatory trouble.
The Three Types of NDAs
Which NDA fits depends on who is sharing information with whom.
A unilateral NDA runs one way: one party discloses, the other agrees to keep quiet. This is the common form used when hiring employees, onboarding contractors, or pitching an idea to an investor.
A mutual NDA binds both sides because both are sharing. Joint ventures, merger discussions, and partnership negotiations almost always use a mutual NDA, since each company is opening its books or technology to the other.
A multilateral NDA covers three or more parties under a single agreement. Research collaborations and multi-investor deals use this structure to avoid drafting a separate bilateral contract between every pair of signers.
What an NDA Can Protect
NDAs can cover almost any kind of business information, but the strongest legal footing applies to material that qualifies as a trade secret under federal law. The Defend Trade Secrets Act defines a trade secret as business, financial, scientific, technical, or engineering 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 USC 1839 – Definitions That reaches software source code, manufacturing processes, customer lists, pricing models, and unpublished patent applications, among much else.p>
Protection isn’t limited to trade secrets. Companies routinely use NDAs to shield marketing strategies, internal financial projections, employee compensation data, and draft business plans. What matters is that the agreement describe the protected material with some precision. An NDA that vaguely covers “all business information” is harder to enforce than one that names specific categories.
What No NDA Can Lock Down
Even broad language cannot cover information that doesn’t genuinely need protection. Courts and standard practice carve out several categories:
- Information already public through no fault of the receiving party. A feature described in a press release or a figure in an SEC filing is fair game.
- Information the receiving party can prove it already knew before signing. Experienced companies document their prior knowledge before entering NDA talks for this reason.
- Information lawfully obtained from a third party who had no confidentiality obligation.
- Work the receiving party develops independently, without reference to the disclosed material. Companies working on similar technology often insist on a broad independent-development carve-out.
- Disclosures compelled by a court order or subpoena. A private contract cannot override a legal obligation, though most NDAs require prompt notice so the disclosing party can seek a protective order.
Courts have also long held that an employee’s general skills and professional experience are not trade secrets, even if those skills were sharpened on the job. An NDA that effectively bars someone from working in their field is likely to face enforceability problems.
What a Workable NDA Contains
A short list of provisions does the heavy lifting. Miss one and the whole agreement can wobble.
Parties and Purpose
The agreement names the disclosing party and the receiving party, and in a mutual NDA each side plays both roles. It should also state why the information is being shared, because that stated purpose limits how the receiving party can use it. Information shared for evaluating a potential acquisition cannot be repurposed for a competitor’s product development.
Definition of Confidential Information
This is the most negotiated section and the one most likely to decide enforceability. Language like “all proprietary information” gives the disclosing party broad theoretical coverage but often collapses in court. The sturdier approach names specific categories and, where practical, requires written disclosures to be marked “Confidential” and oral disclosures to be confirmed in writing within a set number of days.
Duration
Two clocks run. The disclosure period says how long the parties will exchange information under the agreement. The survival period says how long the duty of confidentiality lasts after the relationship ends. Three to five years is common, though agreements protecting trade secrets sometimes impose obligations that last indefinitely, since a trade secret’s value can persist as long as it stays secret.
Return or Destruction of Materials
A well-drafted NDA requires the receiving party to return or destroy all confidential materials when the agreement ends. Destruction clauses typically require written certification that all copies, including notes and derived documents, have been eliminated. Most agreements carve out an exception for routine backup copies or those legally required to be kept, with the understanding that retained copies stay subject to the NDA.
Remedies
The remedies clause spells out what happens if someone breaches. It determines whether the disclosing party can get emergency court relief or has to settle for slow monetary damages. The details are below.
What Makes an NDA Enforceable
An NDA is a contract, so it has to meet the usual contract requirements. The most important is consideration: each side must receive something of value. When an NDA is signed at the start of a job, the job itself is the consideration. For NDAs signed mid-employment, some jurisdictions treat continued employment as enough; others require something extra, such as a raise, a bonus, or access to new proprietary information. The split matters, because an NDA signed without adequate consideration can be thrown out entirely.
Each signer also needs the legal capacity to understand what they are agreeing to, and the signing has to be voluntary. An NDA signed under threat, or by someone without authority to bind their organization, won’t hold up. Both parties should sign through authorized representatives, and each side should keep a signed copy.
Federal Rules That Limit What an NDA Can Do
An NDA cannot be used to silence someone reporting illegal activity. Several federal rules draw hard lines around how far a confidentiality obligation can reach.
The Required Whistleblower Immunity Notice
Any NDA between an employer and an employee that covers trade secrets or confidential information must include a notice of whistleblower immunity under the Defend Trade Secrets Act. The notice tells the employee that they cannot be held criminally or civilly liable for disclosing a trade secret to a government official or an attorney solely to report a suspected legal violation, or for filing it under seal in a lawsuit.2Office of the Law Revision Counsel. 18 USC 1833 – Exceptions to Prohibitions
The employer doesn’t have to use the exact statutory language. A cross-reference to a company policy document that explains reporting procedures satisfies the requirement. Skipping the notice carries a real cost: an employer who fails to provide it forfeits the right to recover exemplary damages (up to double actual damages) and attorney fees if it later sues that employee for trade secret misappropriation.2Office of the Law Revision Counsel. 18 USC 1833 – Exceptions to Prohibitions This is where a lot of template NDAs downloaded from the internet fall short.
SEC Whistleblower Rule
The Securities and Exchange Commission prohibits anyone from taking action to impede an individual from communicating directly with the SEC about a possible securities law violation, which includes enforcing or threatening to enforce a confidentiality agreement to block such communication.3eCFR. 17 CFR 240.21F-17 – Staff Communications with Individuals Reporting Possible Securities Law Violations The SEC has brought enforcement actions against companies whose NDAs required employees to get company approval before contacting regulators, waive their right to a whistleblower award, or notify the company after filing a report. These provisions are not just unenforceable; including them can trigger an independent violation.
NLRB Limits on Severance Agreements
The National Labor Relations Board’s 2023 decision in McLaren Macomb held that severance agreements with overly broad confidentiality or non-disparagement clauses violate employees’ rights under Section 7 of the National Labor Relations Act.4NLRB. Board Rules that Employers May Not Offer Severance Agreements Requiring Employees to Waive NLRA Rights Section 7 protects employees’ right to organize, bargain collectively, and engage in concerted activity for mutual aid or protection.5NLRB. Interfering with Employee Rights – Section 7 and 8(a)(1) In practice, a severance confidentiality clause that keeps an employee from talking to the NLRB, a union, the media, or coworkers about workplace conditions is unlawful. Narrowly drawn clauses protecting genuine trade secrets or the financial terms of a settlement remain permissible. The ruling applies to NLRA-covered employees, which excludes supervisors, managers, and independent contractors.
Tax Penalty for Sexual Harassment Settlements
Employers that attach an NDA to a sexual harassment or abuse settlement face a tax consequence that is easy to overlook. Under Section 162(q) of the Internal Revenue Code, no deduction is allowed for a settlement payment or related attorney fees connected to sexual harassment or sexual abuse if the payment is subject to a non-disclosure agreement.6Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses The rule applies regardless of the employer’s size. The confidentiality benefit has to be weighed against the loss of a potentially substantial deduction on both the payout and the legal fees.
What Happens When Someone Breaches an NDA
When an NDA is broken, the disclosing party generally has two avenues: a court order to stop the damage, and money to compensate for harm already done.
Injunctions
The most powerful remedy is an injunction, a court order that either stops the breaching party from continuing to disclose or compels specific protective steps. Under the Defend Trade Secrets Act, a court can issue an injunction to prevent actual or threatened misappropriation, though it cannot use the injunction to bar someone from taking a new job entirely.7Office of the Law Revision Counsel. 18 USC 1836 – Civil Proceedings Many NDAs include a provision in which the receiving party agrees in advance that a breach would cause irreparable harm, which makes emergency relief easier to obtain.
Monetary Damages
The DTSA allows recovery of actual losses from the misappropriation plus any unjust enrichment the violator gained that isn’t already captured in the actual-loss figure. The court can instead measure damages as a reasonable royalty for the unauthorized use. If the misappropriation was willful and malicious, the court can add exemplary damages of up to twice the compensatory award, plus attorney fees.7Office of the Law Revision Counsel. 18 USC 1836 – Civil Proceedings
Liquidated Damages
Some NDAs set a predetermined dollar amount payable on breach. These clauses are enforceable only if actual damages would be hard to calculate and the figure is a reasonable estimate of likely losses. A number set arbitrarily high as a deterrent will be struck down as an unenforceable penalty. A number set too low creates the opposite problem: the receiving party may decide that paying is cheaper than keeping the secret.
NDAs Compared to Non-Competes
NDAs and non-compete agreements overlap in purpose but work differently. A non-compete restricts where someone can work after leaving a company. An NDA restricts what information they can share, without limiting their employment choices. The FTC attempted to ban most non-competes in 2024, but a federal court blocked the rule before it took effect, leaving enforcement unsettled. The FTC itself identified NDAs as a viable alternative for protecting trade secrets and sensitive business information. For employers, a well-drafted NDA paired with clear trade-secret policies can offer more durable protection than a non-compete that may be invalidated down the line.