Non-Disclosure Agreements (NDAs): How They Protect Trade Secrets

A non-disclosure agreement (NDA) — also called a confidentiality agreement — is a contract in which one or more parties agree not to disclose specified confidential information. NDAs are the single most common and important tool for protecting trade secrets, because trade-secret law only protects information the owner takes reasonable measures to keep secret, and a signed NDA is powerful evidence of exactly that.

How an NDA protects a trade secret

Trade-secret protection can evaporate the moment information is shared carelessly. An NDA lets a business share sensitive information — with employees, contractors, investors, or potential partners — without losing secrecy, by legally binding the recipient to keep it confidential and use it only for a defined purpose. Just as important, having recipients sign NDAs helps satisfy the "reasonable measures" element the DTSA and UTSA require.

Mutual vs. one-way NDAs

  • Unilateral (one-way) NDA: only one party discloses confidential information; only the recipient is bound. Common when hiring an employee or contractor.
  • Mutual (bilateral) NDA: both parties share confidential information and both are bound. Common when two companies explore a partnership or deal.

Key terms every NDA should define

  • Definition of confidential information — specific enough to be enforceable, broad enough to cover what matters.
  • Permitted use — the limited purpose for which the information may be used.
  • Exclusions — information that is public, already known, or independently developed is typically carved out.
  • Duration — how long the obligation lasts (note: obligations for genuine trade secrets often continue for as long as the information stays secret).
  • Return or destruction of materials when the relationship ends.

NDAs are necessary, not sufficient

An NDA is essential, but it is one layer of a larger program. Courts look at the totality of a company's secrecy efforts, so NDAs work best alongside access controls, marking, and training — the broader set of reasonable measures that keep a trade secret legally protectable.