Patent vs. Trade Secret: Which Should You Choose?

If you have an invention or process with real business value, the first question isn't just "can I patent this?" - it's "should I patent it, or keep it secret?" The two paths protect fundamentally differently, and choosing wrong can be impossible to undo later.

What Each Actually Protects

A patent is a legal monopoly granted by the state, clearly enforceable in court - but it comes at the cost of disclosing your invention's details publicly, and it has a limited term (20 years from the filing date for an invention patent, under the Patent Act B.E. 2522, Section 35).

A trade secret is not something the state registers for you. It's a legal cause of action that arises when someone else "infringes" your secret through dishonest means - not an exclusive monopoly like a patent, and protection only lasts as long as the information genuinely stays secret.

The Core Trade-off: Disclosure vs. Secrecy

A patent requires you to disclose your invention's details publicly (through the application-announcement step under the Patent Act B.E. 2522, Section 28) in exchange for a legally enforceable monopoly for a fixed term. A trade secret requires no disclosure at all, but grants no monopoly either - if someone else independently discovers or develops the same method without copying you, they can legally use it (see the legal section below for details).

When a Patent Makes More Sense

Suited to inventions a competitor can easily "reverse-engineer" from the product itself - mechanisms, structures, or functions that are visible or analyzable the moment the product goes on sale. In that case, a trade secret offers little protection, because the law explicitly permits reverse engineering of a product obtained in good faith - it isn't infringement. The invention still needs to meet the patentability bar: novelty, inventive step, and industrial applicability, under the Patent Act B.E. 2522, Section 5. If you go this route, search existing prior art before filing to assess whether the invention is still novel enough.

When a Trade Secret Makes More Sense

Suited to information that doesn't need to be disclosed to sell your product, and that you can genuinely keep confidential in practice - an internal manufacturing formula, a process that never shows up in the finished product, or customer data. The upside: it never expires as long as it stays secret. But there's a condition that's often overlooked: the law requires the owner to have actually "taken appropriate measures to maintain secrecy" (like NDAs and access controls) - otherwise the information never qualifies as a trade secret under the law to begin with.

How Trade Secrets Are Legally Protected in Thailand

Trade secrets in Thailand are governed by the Trade Secrets Act B.E. 2545 (amended by Act No. 2, B.E. 2558) - a citation not previously used anywhere on this site. The parts relevant to a strategy decision:

• Definition (Section 3): must be trade information not generally known, with commercial value derived from its secrecy, where the owner has genuinely taken appropriate measures to maintain that secrecy - missing any one element means it doesn't qualify
• Infringement (Section 6): disclosure, deprivation, or use of a trade secret without the owner's consent, in a manner contrary to honest trade practices - including breach of contract, inducement to breach confidentiality, bribery, coercion, fraud, theft, or electronic espionage
• What is not infringement (Section 7): good-faith acquisition without knowledge of a prior infringement; independent discovery through one's own expertise; and reverse engineering of a product obtained in good faith (unless expressly barred by agreement with the owner or seller)
• Remedies (Sections 8, 13): the trade secret owner may seek a court injunction (interim and permanent) and damages, including an account of the infringer's profits; where the infringement was willful or malicious, the court may award punitive damages of up to 2x the base amount
• Limitation period (Section 10): an action must be filed within 3 years of knowing of the infringement and the infringer, capped at 10 years from the date of infringement
• Criminal liability (Section 33): a person who publicly discloses a trade secret with malicious intent to harm the business may also face criminal liability, separate from a civil damages claim

Can You Switch Strategies Later?

From patent back to secret: No. Once the Department of Intellectual Property announces (publishes) the patent application under Section 28, the invention's details become public immediately - regardless of whether a patent is ultimately granted. This is a one-way door.

From secret to patent: Possible in principle, but conditional - the invention must still meet the novelty requirement on the day you file, meaning it hasn't already been disclosed in a way that destroys novelty. One narrow exception exists under the Patent Act B.E. 2522, Section 6, final paragraph: disclosure by the inventor themselves, or at a qualifying international trade fair or official public exhibition, within 12 months before filing, does not count as novelty-destroying prior art. But this is a narrow, fact-specific exception - it does not cover, for example, a leak by an employee or reverse engineering by a competitor. Get a case-by-case legal assessment before assuming it applies.

Frequently Asked Questions