The duration of an NDA obligation is one of the most negotiated elements — and one of the most misunderstood. A confidentiality obligation that lasts "in perpetuity" sounds alarming, but may be entirely justified for genuine trade secrets. A 12-month NDA may seem reasonable but could expire before a business transaction concludes. Understanding what duration is appropriate for the information involved is essential before you sign.
What is a Duration Clause?
The duration clause in an NDA specifies how long the confidentiality obligation lasts. Common structures include: fixed term (e.g., "3 years from the date of disclosure"), indefinite with a practical limit tied to the information remaining confidential (e.g., "until the information becomes publicly known"), or perpetual (no end date). The appropriate duration depends on the nature of the information: trade secrets can justify permanent protection; business plans typically only need protection until a project concludes.
Red flags to watch for
If the information disclosed is a business plan, product roadmap, or financial projection — not a genuine trade secret — perpetual confidentiality is over-reaching. Information of this type becomes commercially irrelevant after a few years.
It's standard for confidentiality obligations to survive termination of the underlying relationship. But this should be time-limited. A clause saying obligations "survive termination indefinitely" is effectively perpetual.
Conversely, a 12-month NDA for actual trade secret information (formulae, source code, proprietary processes) may not protect the disclosing party adequately.
A sophisticated NDA might apply different durations to different categories of information. An NDA applying the same duration to all information regardless of sensitivity is a blunt instrument.
Even a finite NDA should specify what happens to confidential materials after the duration expires: return them, destroy them, or confirm their deletion.
Your legal rights
UK courts will generally enforce NDA duration clauses unless they are unreasonably wide. For trade secrets, indefinite protection may be justified under the Trade Secrets (Enforcement, etc.) Regulations 2018. For standard business information, proportionality is the test. In employment contexts, very long NDA obligations may be subject to the same reasonableness scrutiny as restrictive covenants. If you were required to sign an NDA to prevent you from reporting a crime, safeguarding concern, or whistleblowing disclosure, that aspect of the NDA is unenforceable under the Public Interest Disclosure Act 1998.
Questions to ask before you sign
- 1How long do the confidentiality obligations last, and does this vary by type of information?
- 2Do the obligations survive termination of the underlying relationship, and for how long?
- 3Is the duration appropriate given the nature of the information being shared?
- 4What happens to confidential materials once the duration expires?
- 5Does the NDA carve out whistleblowing and protected disclosures under UK law?
Disclaimer: This guide is for educational purposes only and does not constitute legal advice. Contract law varies by jurisdiction and individual circumstances. Always consult a qualified legal professional before making decisions based on this information.