Trade Secrets: How to Protect Your Competitive Advantage

Quick answer: How to protect trade secrets in Europe comes down to one legal test founders fail: can you prove you took reasonable steps to keep them secret? Identify them, restrict access to need-to-know, record them in a register, and tell people what is secret. If a competitor could reverse engineer it from your product, patent it instead.

A trade secret only survives if you treat it like one.

Everyone tells investors they have trade secrets. Very few founders can say what they are or who can see them. That is not a trade secret. That is a rumour about your own company.

I spent 20 years as an engineer and CTO before Lightbringer and have managed over 300 patent families. Patents have a process. Trade secrets have no office, no examiner, no certificate. The responsibility is yours, and the law is national. This is business advice, not legal advice.

What is a trade secret? Three tests, and founders fail the third

Under the EU Trade Secrets Directive, information is a trade secret only if it is not generally known in your sector or readily accessible, has commercial value because it is secret, and has been subject to reasonable steps to keep it secret.

That third test is the one founders get wrong. 'Reasonable' is a sliding scale, and the burden of proving you met it sits with you. No reasonable steps, no trade secrets. Not weak protection. None.

The rules are simple. Identify. Restrict. Document. Train. Enforcement here means the people who touch a secret know it is one, not lawsuits. A process parameter posted in #general and repeated to a supplier by someone who did not know is gone. Nobody was malicious. You just never treated it like one.

Sales is your biggest leak. Founders are the second

The biggest leak is almost always accidental. Not espionage. A salesperson in a meeting without an NDA, a sharp question from a prospect, a good answer. With the trade secret. Founders do the same when a question goes one level deeper than planned. I have seen it, probably lived it, and likely done it myself.

The fix is not paranoia. The fix is training. Define what can be said and what sits behind the line. People who know where the line is rarely cross it.

The second leak walks out the door. An engineer takes a better offer, maybe from your competitor. Their skill and general experience go with them, and no law stops that. The specific secrets should not. But if you never told them which things were secret, you will struggle to argue the difference later. Your exit routine must restate obligations, recover material, and hand over the list of what they cannot take.

Trade secret vs patent: the magician rule

There is value in trade secrets alongside patents. Patent everything and you have handed competitors a blueprint. A patent protects what the granted claims cover, not the failed attempts behind them. Negative results, yield tuning, data sets, scale-up fixes: a deep tech company's most valuable IP is usually invisible on the product side and never filed.

So think like a magician. Patent what is on stage, because someone will try to copy it. Keep everything behind the curtain secret.

My rule of thumb: imagine a competitor willing to spend a million dollars and a thousand hours taking your product apart. If they can find it, patent it, and file before you disclose. If they cannot, keep it secret. Because reverse engineering a lawfully bought product to learn about your product in the absence of a contractual restriction is legal in the EU. Trade secrets stop unlawful acquisition, use, and disclosure. They do not stop independent development, and they do not create a monopoly. Only a patent does that.

If patents are all you have, you may be weaker than you need to be. If secrets are all you have, you are one engineer away from nothing. You need both.

Keep a trade secret register

Record what each secret is, who owns it, where it lives, who has access, and every disclosure. A spreadsheet works at seed. Lightbringer does it next to your patents. Either way, the register is your evidence for the reasonable steps test. It also turns "the value in our engineers' heads" into an asset an investor can assess.

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FAQ

What counts as reasonable steps to protect a trade secret?

The directive does not define it. Courts look for three things: people were told it was secret, access was limited, and contracts backed it up.

Is reverse engineering a trade secret legal?

Yes, you are allowed to reverse engineer a lawfully bought product in the EU unless a contract forbids it.

Can I still patent something I kept as a trade secret?

Yes, while it is still secret. Disclose it publicly first and it becomes prior art against your own application.

NOTE: THIS IS NOT LEGAL ADVICE. TRADE SECRET RULES DIFFER BY COUNTRY.