Mutual or one-way NDA: which one should you sign?

What “mutual NDA” means

In a mutual (bilateral) NDA each party may disclose confidential information and each party promises to protect what it receives. Each is the disclosing party for its own information and the receiving party for the other side's. In a one-way (unilateral) NDA only one party discloses, and only the recipient takes on obligations; the discloser promises nothing about confidentiality.

Both are ordinary contracts and neither is more “official” than the other. The UK Intellectual Property Office, for example, publishes a one-way and a mutual template side by side. The difference is simply who carries the duty of confidence.

When a mutual NDA is the right choice

Choose mutual when information will flow in both directions: two companies exploring a partnership or a joint product, a supplier integrating with a customer's systems, a possible acquisition where the buyer also explains its plans, or two start-ups comparing technology. In those talks it is hard to predict who will reveal what, and a mutual NDA avoids a second agreement later.

Choose one-way when the flow is clearly one direction: a company briefing a freelancer, a supplier quoting on a new product, a candidate seeing internal material, or a founder showing a detailed plan. Asking the recipient to sign a mutual NDA there adds promises that protect nobody, and a one-way NDA is shorter to read.

A useful rule when you are the one being asked to sign: if you expect to share anything of your own, such as pricing, a roadmap or your own code, ask for the NDA to be mutual. Converting a one-way draft is usually a matter of replacing the named parties in each obligation with “each party” or “the receiving party”.

How to check that a mutual NDA really is mutual

Search the document for the other company's name. In a genuinely mutual NDA the names appear in the opening lines and the signature blocks, while the operative clauses speak of “each party”, “the disclosing party” and “the receiving party”. If a clause says that one named company must keep information secret, that clause is one-way, whatever the title says.

Then compare the pairs: is the definition of confidential information the same for both sides, do both get the standard exclusions, is the duration the same, and do both have to return or destroy material at the end? Look last at remedies and extras. A clause giving only one party an injunction, legal costs or an indemnity, or letting one party use what its staff remember, tilts the agreement even when everything else is symmetrical.

Whoever drafts a mutual NDA has to live with its terms too, so mutual drafts are often more balanced than one-way ones. That is a tendency, not a guarantee, which is why the side-by-side check is worth the five minutes.

Signing a mutual NDA

A mutual NDA has a signature block for each party. Sign only in your own block: add your signature, printed name, job title if you sign for a company, and the date. Leave the other block empty for the other side.

The usual order is that one party signs and sends the PDF, the other adds its signature to the same file and returns the fully signed copy. Alternatively each side signs a separate but identical copy; agreements signed this way are said to be signed in counterparts, and the signed copies together make up the contract. Many NDAs include a counterparts clause that says so expressly. Either way, make sure you end up holding a copy that carries both signatures.

Sources

• UK Intellectual Property Office: one-way and mutual non-disclosure agreement templates
• Cornell LII: counterpart (signing a contract in several identical copies)