What Is Confidential Information? Definition And Use (2026)

Definition and Meaning of Confidential Information

So what is confidential information? There is no single legal definition for confidential information. Instead, information is confidential based on how parties handle it.

For example, trade secret information is protected from disclosure by business law. Medical ethical rules and evidence law protect information shared with doctors, while federal espionage laws protect the government’s secrets.

The type and nature of the information may differ, but in all these cases, the parties expect the information not to spread.

Types and Classes of Confidential Information

Examples of confidential information include:

• Non-public financial information
• Health information disclosed to a doctor or insurer
• Facts disclosed to a lawyer when seeking legal help
• Facts disclosed to a spiritual advisor
• Trade secrets
• National security information

The law protects these types of confidential information differently. Ethical duties, court orders or laws can all be used to keep information from circulating.

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Criteria for Determining Whether Information Is Confidential

There are usually two criteria when determining confidentiality. First, you must look at the parties’ intent. What is confidential information’s purpose in your situation? If the parties meant for the information to be confidential, there’s a good chance that it is.

Second, consider whether the information is publicly known. If the information is public, it is probably not confidential. For example, a person might want to keep the terms of their divorce secret. However, anything in public court records and divorce papers is not confidential.

There are exclusions to be aware of. Not everything shared in a professional setting will be automatically confidential. If you face a lawsuit for breaking confidentiality, you can rely on some defenses. One of these is proving that the information entered the public domain with no help from you.

You may also not have breached confidentiality if the receiver of the information already knew what you told them. Finally, you might also be able to avoid a lawsuit by showing that the information was independently developed. It will require proving that the receiver did not use the discloser’s proprietary data.

Levels and Degrees of Confidentiality

The levels and degrees of confidentiality are often determined by the exceptions to the rules and the possible penalties for disclosure. For example, confidential information disclosed to a lawyer is confidential.

However, ethical rules allow a lawyer to break confidentiality if it is necessary to prevent death or serious bodily injury to another. In this case, the lawyer wouldn’t face discipline or a malpractice lawsuit because disclosure was necessary.

Conversely, a party that discloses a trade secret may be sued for damages. In these cases, there is usually no exception for the party’s obligation to maintain secrecy.

How to Protect Confidential Information

Some duties of confidentiality arise automatically. For example, your doctor is generally obligated to keep your health information confidential.

In other cases, you can use a non-disclosure agreement (NDA) to preserve confidentiality. What is an NDA? An NDA is a contract that obligates a party to refrain from disclosing protected information.

When considering an NDA vs. confidentiality agreement, keep in mind that they are essentially very similar documents. One of the differences is directionality, with most NDAs being unilateral, which means they protect one-way flow of information. Confidentiality agreements tend to bind all parties involved to secrecy.

Confidentiality agreements can involve numerous parties, while NDAs tend to involve just two.

While confidentiality agreements are more commonly used in standard employment contracts and corporate partnerships, NDAs are more appropriate when one party shares trade secrets or ideas with another party. An example would be an inventor pitching to an investor.

How long does an NDA last? Like confidentiality agreements, there is no universal limit. There may be a fixed term, or the agreement could be event-based. In some instances, it could be perpetual.

If the information becomes public without help from the parties involved, the NDA or confidentiality agreement is no longer enforceable.

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