What Is an NDA? Non-Disclosure Agreement Explained
February 25, 2026
What Is an NDA?
An NDA (Non-Disclosure Agreement), also called a confidentiality agreement, is a legal contract between two or more parties that establishes the confidential nature of information shared between them and restricts its disclosure to third parties. NDAs are standard in business partnerships, employment, investment discussions, product development, and any situation where sensitive information is exchanged.
Types of NDAs
Unilateral (One-Way) NDA
Only one party discloses confidential information; only the receiving party has confidentiality obligations. Common in employment (employee signs to protect employer's information) and vendor relationships.
Bilateral (Mutual) NDA
Both parties share confidential information and both have confidentiality obligations. Common in partnerships, joint ventures, and M&A discussions.
Key NDA Clauses Explained
Definition of Confidential Information
The most important clause — what exactly is protected? Broad definitions like "all information disclosed in any form" are common. Most NDAs carve out:
- Information already in the public domain
- Information independently developed without reference to disclosing party's info
- Information received from a third party without confidentiality obligation
- Information required to be disclosed by law (with required notice to the disclosing party)
Obligations of Receiving Party
- Use information only for the stated purpose (e.g., evaluating a business relationship)
- Protect with same care as own confidential information (typically "reasonable care")
- Restrict access to employees/contractors on a need-to-know basis
- Not copy or reproduce beyond necessity
Duration
How long does the confidentiality obligation last? Common terms:
- 2-3 years from disclosure date (standard for general business info)
- 5 years (for technical or more sensitive information)
- Indefinitely (for trade secrets — legally required by most courts anyway)
Note: Even after the NDA expires, trade secrets remain protectable under separate trade secret law.
Return or Destruction
Upon termination or request, the receiving party must return or certify destruction of confidential information (including copies). This clause is increasingly difficult to enforce practically but remains standard.
Remedies
NDAs typically specify that breach will cause irreparable harm, entitling the disclosing party to injunctive relief without posting bond — making it faster to get a court order to stop unauthorized disclosure than in typical civil litigation.
What NDAs Cannot Do
- Protect information that is already public
- Prevent someone from working in their field after employment (that requires a separate non-compete)
- Prevent reporting illegal activity to authorities (illegal NDA in most jurisdictions)
- Override a court order to disclose
Extract NDA Data Automatically
Legal and compliance teams reviewing large volumes of NDAs use Legal Doc Pro to extract key NDA terms automatically — party names, scope, duration, jurisdiction, and key clauses — from PDF confidentiality agreements. Structured output for contract management systems.