NDAs: when you actually need one, and when it's theatre
The NDA is the most casually signed document in business — pinged over, signed unread, filed and forgotten. Which is a shame, because it's a binding contract that occasionally has teeth.
By Robert Festenstein, Head of Legal
Updated 1 July 2026
5 min read
The short version
- An NDA (confidentiality agreement) is a binding contract to keep specified information private.
- Use one before sharing genuinely sensitive information — a deal, your figures, your technology.
- One-way or mutual, the scope, duration and definition of 'confidential information' are what matter.
- An NDA is only as good as your willingness and ability to enforce it — it's not a magic spell.
What an NDA does
A non-disclosure agreement — an NDA, or confidentiality agreement — is simply a contract where one or both sides promise to keep certain information private and to use it only for an agreed purpose. That's it. It turns "please don't tell anyone" from a hope into a legal obligation you can, in principle, enforce.
When you actually need one
Reach for one before you share something genuinely sensitive that would cause you harm if it got out or was misused: your financial figures in a potential sale, your customer list, a new product or piece of technology, the details of a deal in negotiation. If the information is already public, or you wouldn't really care if a competitor saw it, an NDA is just paperwork for its own sake — theatre that makes everyone feel businesslike without protecting anything.
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The terms that matter
When you do use one, a few things decide whether it's worth anything. Is it one-way (only one side is disclosing) or mutual (both are)? How is "confidential information" defined — tightly enough to be meaningful, broadly enough to cover what you're sharing? What's the permitted purpose — the only thing they're allowed to use the information for? And how long does the obligation last? Sign one going the other way — where you're the one receiving information — and read it just as carefully, because you're taking on real obligations and you don't want to accidentally agree not to work with a whole sector.
What it won't do
Be realistic about the limits. An NDA doesn't physically stop anyone doing anything — it gives you a claim if they breach it. And proving breach, and proving loss, can be hard. It's a genuine deterrent and a useful piece of protection, but it's not a force field. Treat it as one sensible layer, alongside only sharing what you need to, with people you have some reason to trust — not as permission to hand your crown jewels to a stranger.
Frequently asked questions
Do I really need an NDA before talking to someone?
If you're about to share genuinely sensitive information — your figures, a product, a deal — yes, a well-drafted NDA is worth having first. If the information isn't really confidential, or you wouldn't mind a competitor seeing it, an NDA adds little beyond ceremony. Match the protection to what's actually at stake.
Should I just sign the NDA someone sends me?
Not without reading it. An NDA is a binding contract, and if you're the one receiving information you're taking on real obligations — sometimes surprisingly wide ones that could limit who else you can work with. Check the scope, the purpose and the duration before you sign.
Is an NDA enough to protect my idea?
It helps, but it's not a force field. An NDA gives you a claim if someone misuses your information — it doesn't physically prevent them, and proving breach and loss can be difficult. Use it as one layer alongside sharing only what you must, with people you have reason to trust.
Sources & further reading
This article is general information, not legal advice. The law changes and depends on your circumstances — always take advice on your specific situation before acting. Last reviewed 1 July 2026. Buzz Solicitors is a trading name of AD Solicitors Limited, a recognised body regulated by the SRA (no. 8011228).
A solicitor with more than two decades' experience in commercial law, dispute resolution, insolvency and judicial review. Robert acts for businesses, directors and individuals on the matters that carry real consequence — and leads Buzz Solicitors.
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