A non-disclosure agreement, often shortened to NDA, is a contract in which one or more parties promise not to disclose specified confidential information. Businesses use them to protect trade secrets, product plans, customer lists, and other sensitive material shared during employment, negotiations, or partnerships. An NDA does not protect information that is already public or that the recipient already lawfully knew. Its value depends on how clearly it defines what is confidential and how reasonably it limits the recipient's freedom.
What an NDA Does
At its core, an NDA creates a duty of confidentiality. The recipient agrees to keep certain information secret, to use it only for stated purposes, and to limit who else inside their organization may see it. If the recipient breaks that duty, the disclosing party may seek damages or ask a court for an injunction. Some agreements add a clause requiring the recipient to return or destroy the confidential material when the relationship ends.
Unilateral and Mutual NDAs
| Type | Who is bound | Typical use |
|---|---|---|
| Unilateral | One party agrees to keep the other's information confidential | An employer sharing plans with a new hire, or a company sharing data with a vendor |
| Mutual | Both parties agree to protect each other's information | Business negotiations, joint ventures, and merger talks |
Key Elements of an Enforceable NDA
Courts look for the basic elements of any contract: an offer, acceptance, consideration, and a lawful purpose. Beyond that, a workable NDA usually includes:
- A clear definition of confidential information. Vague terms invite disputes, so the agreement should describe categories or examples.
- Exclusions. Information that is already public, was known before disclosure, is independently developed, or is required to be disclosed by law.
- Obligations. How the recipient must protect the information and who may access it.
- Term. How long the duty lasts, often a set number of years, though trade secret protection may last longer.
- Remedies. Whether the disclosing party can seek an injunction and attorney fees.
- Governing law and venue. Which state's law applies and where disputes will be heard.
Common Exclusions and Carve-Outs
Most NDAs carve out information that the recipient can show was already in the public domain, was in the recipient's possession before disclosure, was received from a third party without a duty of confidentiality, or was independently developed. Another common carve-out permits disclosure when required by law, court order, or a government investigation, sometimes with advance notice to the disclosing party. Whistleblower protections may also override confidentiality clauses in certain contexts, so those limits should be addressed directly.
Where NDAs Are Used
NDAs show up in many settings: new employees and contractors, business partnership and acquisition talks, software and technology licensing, investor discussions, real estate transactions, and settlements of disputes. In employment, an NDA is often paired with a non-compete or non-solicitation clause, but the three are different. An NDA restricts disclosure of information. A non-compete restricts where a person may work. A non-solicitation clause restricts recruiting employees or customers. Each is governed by its own rules and, in many states, by specific statutes that limit enforceability.
Enforceability and State Variation
Contract law is primarily state law, so NDA rules differ across the country. Courts generally refuse to enforce a clause that is unreasonably broad in scope, duration, or geography, and some states scrutinize employment NDAs closely. A federal law known as the Speak Out Act limits the enforceability of pre-dispute nondisclosure clauses that cover sexual harassment or sexual assault claims. Rules on non-competes have also been changing at both the federal and state level, so anyone relying on one should confirm the current law in the relevant state. Trade secret protection is separately governed in most states by a version of the Uniform Trade Secrets Act and at the federal level by the Defend Trade Secrets Act, which also includes whistleblower immunity provisions.
NDAs and Trade Secrets
An NDA is one tool for protecting trade secrets, but it is not the only one. Trade secret law protects information that has independent economic value and is subject to reasonable efforts to keep it secret. A well-drafted NDA can show those reasonable efforts, which supports a trade secret claim. In some cases, a party can sue for trade secret misappropriation even without an NDA, but a written agreement makes the obligations clearer and can provide additional remedies.
Common Mistakes to Avoid
Parties often run into trouble by using a generic template without tailoring it to the deal. A definition of confidential information that is too broad may be unenforceable, while one that is too narrow may leave key material unprotected. Failing to mark or track confidential information, or sharing it too freely inside an organization, can undermine a later claim. Assuming an NDA covers non-competition or non-solicitation is another frequent error, because those restrictions need their own clauses and must satisfy separate legal standards.
Practical Tips
- Define confidential information precisely and mark materials when practical.
- Keep the term reasonable and match it to the sensitivity of the information.
- Make sure both sides receive something of value, so consideration is clear.
- Review the governing law clause; it decides which state's rules apply.
- Do not assume an NDA covers conduct it does not name, such as soliciting customers.
- Have a lawyer review any agreement tied to a job, a sale of a business, or a settlement.
Where to Learn More
Cornell's Legal Information Institute at law.cornell.edu offers free summaries of contract and trade secret law. Federal statutes, including the Defend Trade Secrets Act and the Speak Out Act, are available at govinfo.gov and congress.gov. Because enforceability is largely a matter of state law, check your state's statutes and court decisions, and consult a licensed attorney before signing or enforcing an NDA.
This guide is general legal information, not legal advice. The enforceability of an NDA depends on its terms, the facts, and the applicable state law, so consult a licensed attorney for advice about a specific agreement.