Types of non disclosure agreements (NDAs)

Key takeaways:

• Determine which NDA type fits your situation by analyzing information flow – use unilateral agreements when only one party discloses confidential information (such as with employees or contractors), bilateral agreements when both parties exchange sensitive data (such as in mergers or partnerships), and multilateral agreements when three or more parties need protection.
• Include five essential elements in every NDA to ensure enforceability – a clear definition of what qualifies as confidential information, specific obligations for the receiving party, exclusions from confidentiality (like publicly available information), the duration of confidentiality obligations, and remedies for breach.
• Protect confidential information during preliminary negotiations before the NDA is signed by discussing sensitive data only in general terms (such as trade secrets or confidential data) rather than revealing actual substance or specifics.
• Consider multilateral NDAs when three or more parties need to share and protect information, as one agreement eliminates the need for multiple bilateral contracts, reduces administrative costs, and ensures consistent terms across all relationships.

A non-disclosure agreement (NDA) is one of those foundational business documents that seems simple on the surface but can get surprisingly nuanced once you dig in. Whether you’re hiring a new contractor, exploring a potential partnership, or getting ready to share your latest product roadmap with a vendor, understanding which type of NDA fits your situation is the first step to keeping your confidential information safe.

There are three main types of NDAs: unilateral, bilateral, and multilateral. Each one serves a different purpose depending on who’s sharing information and who needs to keep it confidential. In this guide, we’ll walk through what makes each type unique, when to use them, and how to manage them effectively with the right tools.

What is an NDA?

A non-disclosure agreement (NDA) is a legally binding contract between two or more parties that prevents the sharing of confidential information. Also known as confidentiality agreements (CAs), proprietary information agreements (PIAs), or confidential disclosure agreements (CDAs), NDAs create legal obligations around what information can and cannot be shared outside the relationship.

NDAs protect sensitive business information like trade secrets, client lists, financial data, and proprietary processes. When one party shares confidential information with another—whether an employee, contractor, vendor, or business partner—an NDA establishes clear boundaries around how that information can be used.

If someone violates an NDA by sharing or using protected information without permission, courts can provide remedies including financial damages, injunctions, and other legal relief. This legal protection makes NDAs essential tools for protecting competitive advantages—trade secret theft costs the U.S. over $300 billion annually—and maintaining trust in business relationships.

The three types of NDAs

NDAs fall into three main categories based on how many parties share confidential information. Understanding which type fits your situation determines how you structure the agreement and what obligations each party accepts.

• Unilateral NDAs require only one party to share confidential information with another party who must protect it. These one-way agreements are the most common type, used in employer-employee relationships, vendor evaluations, and client consultations.
• Bilateral NDAs require both parties to share confidential information with each other and protect what they receive. Also called mutual NDAs, these two-way agreements appear in mergers and acquisitions, joint ventures, and partnership negotiations where both sides disclose sensitive business information.
• Multilateral NDAs involve three or more parties where at least one party shares confidential information that the others must protect. These multiparty agreements eliminate the need for separate bilateral agreements between each pair of parties.

Unilateral NDAs

A unilateral NDA is a one-way confidentiality agreement where only one party shares confidential information that the other party must protect. The receiving party agrees not to disclose or use the shared information beyond the agreed purpose.

Unilateral NDAs are the most common type of NDA. You’ll encounter them whenever a company needs to share confidential information with employees, contractors, advisors, clients, or potential business partners who don’t need to share their own confidential information in return.

Here are the most common types of unilateral NDAs:

Employer-employee NDAs

Employers often require employees to sign these NDAs once they are hired. These agreements restrict the employees from using and disseminating confidential company information, such as:

• Trade secrets
• Business and development plans
• Pricing data
• Supply sources
• Operation plans
• Merchandising systems
• Technical information such as projections and inventions

Company-contractor NDAs

Companies can use these NDAs to limit contractors from sharing confidential company information. Like employer-employee NDAs, company-contractor NDAs limit contractors from sharing critical business information that could reduce the competitiveness of the company.

Companies may also add conflict of interest clauses and non-competition clauses to these NDAs to limit contractors from applying what they’ve learned to competing work. Because contractors are independent workers with more flexibility and autonomy than employees, companies typically impose stricter limitations to prevent them from using or sharing information that could affect competition.

Inventor-evaluator NDAs

Inventors can use unilateral NDAs to protect their inventions from being patented, used, or marketed by the evaluator. These NDAs also limit evaluators from using and disclosing the inventor’s:

• Business operations including the inventor’s financial information, vendor information, internal cost information, external business contacts, and the methods and manners of conducting business
• Customer information including the names of the customers, their contact information, and the data they provided
• Intellectual property including test data and test results, status and details of research and development of services and products, patents, copyrights, and trade secrets
• Service information including all data related to the inventor’s products and services
• Accounting information including all balance sheets, company liability information, expense reporting, and profit and loss reporting

Seller-buyer NDAs

Sellers can use NDAs to limit the buyer from sharing confidential information that they were exposed to during the sale of goods or services. They usually limit buyers from sharing the following:

• Business operations Such as the seller’s financial and internal information
• Intellectual property Such as the information relating to the seller’s proprietary rights and the status and details of research and development
• Production processes Including the processes used in the creation, manufacturing, and production of the seller’s products and services
• Computer technology Including all technical and scientific information pertaining to any process or machine used by the seller

Bilateral NDAs

A bilateral NDA is a two-way confidentiality agreement where both parties share confidential information with each other and both agree to protect what they receive. Also called mutual NDAs, these agreements create reciprocal obligations so each party can safely disclose sensitive business information.

Bilateral NDAs commonly appear in situations where both parties need to exchange substantial private information during negotiations. Corporate takeovers, joint ventures, and mergers and acquisitions all typically require bilateral NDAs since both sides must evaluate each other’s financial data, operations, and strategic plans.

Multilateral NDAs

A multilateral NDA is a confidentiality agreement involving three or more parties where at least one party shares confidential information that the others must protect. These multiparty agreements establish protection obligations among all parties in a single contract.

The key advantage of multilateral NDAs is efficiency. Instead of creating three separate bilateral NDAs between parties A and B, B and C, and A and C, you can use one multilateral NDA covering all three parties. This reduces administrative burden—the average cost of a low-risk contract has risen 38% in recent years—and ensures consistent terms across all relationships.

Multilateral NDAs are often found in complex, negotiation-heavy deals. A typical example is a multiparty confidentiality agreement where three or more companies ensure each party only discloses information needed to determine whether further agreements make sense.

Key elements of an NDA

Every NDA should include several core components regardless of type. These elements create the legal framework that makes the agreement enforceable and protect both parties’ interests.

Definition of confidential information

The NDA must clearly define what information counts as confidential. Be specific about categories like trade secrets, financial data, customer lists, technical specifications, and business strategies. Vague definitions create enforcement problems later.

Obligations of the receiving party

The agreement should spell out exactly what the receiving party can and cannot do with confidential information. This includes restrictions on disclosure, limits on use, and requirements for protecting the information from unauthorized access.

Exclusions from confidentiality

Not all information shared under an NDA remains confidential forever. Standard exclusions include information that becomes publicly available, information the receiving party already knew, and information independently developed without using the confidential material.

Term and duration

The NDA should specify how long confidentiality obligations last. Some information may need protection for just a few years, while trade secrets might require indefinite protection. Clear timeframes prevent disputes about when obligations end.

Remedies for breach

The agreement should outline what happens if someone violates the NDA. Typical remedies include financial damages, injunctive relief to stop further disclosure, and recovery of legal fees. Having these consequences spelled out upfront creates stronger deterrence.

Writing and managing NDAs effectively

Once you understand which type of NDA you need, you’ll want to create and manage it efficiently. While NDAs are generally standardized, low-friction agreements—averaging just 12 days to sign with only 15% using counterparty paper, according to the 2026 Contracting Benchmark Report—they still require careful handling. Here’s how to handle the process from draft to execution.

Determine which type fits your situation

Start by mapping out your specific scenario. If you’re the only party sharing confidential information—like hiring an employee or working with a contractor—a unilateral NDA fits. If both parties need to exchange confidential information, you’ll need a bilateral NDA. When three or more parties are involved and at least one needs to share confidential information, use a multilateral NDA.

Create a clear, specific agreement

After you’ve determined what kind of NDA you need, it’s time to draft the contract. Think about your role and your relationship with the other parties. List out specific examples and categories of information you want to protect rather than using vague language—this specificity makes enforcement easier if problems arise later.

For instance, if both you and the other party are inventors, specifically limit sharing of test data, test results, copyrighted material, and any other information that could make your invention less competitive if leaked.

Protect information before the NDA is signed

It’s easy to reveal confidential information during negotiations before parties sign the NDA. This creates risk since confidentiality obligations haven’t kicked in yet.

To avoid this, be deliberate about what you say and how you say it. Refer to your confidential information in general terms—”trade secrets” or “confidential data”—rather than describing the actual substance. Keep early conversations focused on the structure and scope of the agreement itself, like duration and restrictions, rather than the specifics of what you’re protecting.

Use contract management tools for execution and tracking

Once you’ve drafted the NDA, contract management (CLM) platforms make it easier to manage and execute the agreement. For example, Ironclad’s Repository lets you store and organize NDAs in one centralized location, making it simple to locate the NDA you need, build reports, give users from other departments access to contract data, and track upcoming obligations and deadlines within seconds.

The CLMs also typically have no-code workflow builders that work straight out of the box without requiring technical expertise or long implementation times. The simple drag-and-drop interface lets you draft and launch NDA generation and approval processes in minutes by uploading an NDA template, tagging fields that parties need to fill in, and adding signers and approvers. You can add conditional approvers and conditional contract clauses wherever needed to handle more complex scenarios.

Understanding the three types of NDAs—unilateral, bilateral, and multilateral—helps you choose the right protection for each business relationship. Start by identifying how many parties need to share confidential information, then structure the agreement with clear terms, specific definitions, and proper legal protections.

The challenge comes when you’re managing more than a handful of NDAs across different relationships and teams. Even with their standardized nature, the report shows that NDAs still require legal involvement 27% of the time, highlighting that teams preserve oversight where it matters without adding unnecessary friction. Tracking obligations, renewal dates, and compliance requirements manually costs organizations over 9% of annual revenue and eats up time you could spend on higher-value work. A centralized platform for NDA drafting, routing, and storage can solve these challenges, letting you focus on protecting your information, not on paperwork. To see how Ironclad does it, request a demo today.

Frequently asked questions about NDA types

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Ironclad is not a law firm, and this post does not constitute or contain legal advice. To evaluate the accuracy, sufficiency, or reliability of the ideas and guidance reflected here, or the applicability of these materials to your business, you should consult with a licensed attorney. Use of and access to any of the resources contained within Ironclad’s site do not create an attorney-client relationship between the user and Ironclad.