Trade secrets vs. patents: a founder's honest guide

Introduction

Here's something a patent attorney doesn't often say: not everything should be patented.

That might seem like a strange thing to lead with on a patent filing platform. But it's true, and understanding when to patent and when not to will make you sharper about both.

The choice between patent protection and trade secret protection is one of the most important strategic IP decisions a founder makes. Most founders make it by default rather than by design. They patent because it feels like the thing to do, or they don't patent because it seems expensive and complicated, without ever really thinking through which protection actually fits what they've built.

Here's how to think about it properly.

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What a patent gives you

A patent gives you an exclusive right, for 20 years from filing, to prevent others from making, using, or selling your invention in the territories where the patent is granted. That right is enforceable in court. It's public, documented, and doesn't depend on keeping anything secret.

The key trade-off: to get that right, you have to disclose. Your patent application describes your invention in enough detail for a skilled person to reproduce it. That description is published 18 months after filing, regardless of whether the patent grants. Your competitors can read it.

In exchange for that disclosure, you get a legal monopoly. Nobody can copy your invention, even if they discover it independently. Even if they reverse-engineer it from your product. The right is absolute, within its scope.

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What a trade secret gives you

A trade secret is any information that gives you a competitive advantage and that you take reasonable steps to keep confidential. It has no fixed term. It lasts as long as the secret is maintained. There's no registration, no filing fee, no disclosure, and no expiry.

The Coca-Cola formula is the famous example. It's been a trade secret for over 130 years, far beyond any patent term.

The downside: trade secret protection disappears the moment the secret gets out. Through employee departure, reverse engineering, independent discovery, a data breach. Whatever the cause, once it's public, it's public. You have no legal right to prevent others from using it.

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How do you decide between a patent and a trade secret?

The right question to ask is: can my invention be reverse-engineered from the product?

If yes, patent it. If someone can buy your product, take it apart, and figure out how it works, trade secret protection is worthless. The secret won't survive contact with the market. A patent prevents copying even by people who've successfully reverse-engineered the technology.

If no, a trade secret is worth serious consideration. If your competitive advantage lives in your data, your training process, your operational know-how, your proprietary dataset, or your manufacturing process, and none of that is visible in the final product, then keeping it secret may give you more durable protection than a patent, which requires disclosure and expires after 20 years.

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Where it gets more complicated

Most real inventions don't fit cleanly into one bucket. A hardware product might have patentable mechanical innovations (reverse-engineerable from the product) and a proprietary calibration algorithm (not visible in the output). The right answer is often: patent the former, protect the latter as a trade secret.

Software is particularly nuanced. The EPO has a higher bar for patenting software than other jurisdictions, and many SaaS companies operate primarily on trade secret protection, their code, their model architectures, their training pipelines, without realising it. That's a legitimate strategy, but it's worth being deliberate about it.

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The case for patenting even when you could keep a secret

Even when trade secret protection is theoretically available, there are reasons to prefer a patent.

• Investor signalling. A trade secret is invisible. A patent portfolio is documented, searchable, and legible to investors and acquirers who want evidence of a defensible moat.
• Freedom to operate. A patent forces you to disclose your invention, but it also gives you a formal record of your priority date. Trade secrets create ambiguity about who invented what and when. In a dispute, documented patent rights are much easier to defend than claims of prior trade secret.
• Employee mobility. Trade secrets are vulnerable to key employees leaving and taking knowledge with them. A patent protects the invention regardless of who knows about it.

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The honest summary

Patent what can be reverse-engineered. Consider trade secrets for what lives in your data, processes, and know-how. Wherever possible, be deliberate. The worst outcome is protecting nothing because you couldn't decide.

If you're unsure where your invention falls, the answer is usually: talk to an attorney before you decide, not after.

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Conclusion

Patents and trade secrets aren't alternatives. They're a system. Most strong IP strategies use both, applied deliberately to the right parts of the business. The starting point is always the same question: can this be reverse-engineered? Everything follows from the answer.

Take the patentability test now.

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Frequently asked questions

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What's the difference between a patent and a trade secret?

A patent gives you a legal monopoly on your invention for up to 20 years, in exchange for publicly disclosing how it works. A trade secret protects commercially valuable confidential information indefinitely, as long as it remains secret, with no registration or disclosure required. Patents are enforceable even if a competitor independently discovers the same thing. Trade secrets evaporate the moment the information becomes public, for any reason.

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When should a startup use a trade secret instead of a patent?

When the competitive advantage can't be reverse-engineered from the product. If the valuable information lives in your dataset, your training pipeline, your manufacturing process, or your internal methodology, and none of that is visible in the final product, trade secret protection may be more durable than a patent. Patents require disclosure and expire after 20 years. A well-maintained trade secret has no expiry date.

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Can a startup use both patents and trade secrets at the same time?

Yes, and most strong IP strategies do. A hardware product might have patentable mechanical innovations that are visible in the product, and a proprietary calibration algorithm that isn't. The right approach is to patent what can be reverse-engineered and protect as a trade secret what can't. The two forms of protection cover different parts of the same business and aren't mutually exclusive.

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Does a trade secret protect against independent invention by a competitor?

No. If a competitor independently develops the same information without access to yours, they're free to use it. Trade secret protection only applies when the secret has been misappropriated, through breach of confidence, theft, or improper means. A patent, by contrast, gives you rights against anyone who uses the patented invention, even if they developed it completely independently. This is the most significant practical difference between the two forms of protection.