A trade secret is commercially valuable information you keep secret so that competitors cannot get the same advantage you do. It might be a recipe, a manufacturing process, a customer or supplier list, or the prices you buy and sell at. A trade secret is protected for as long as it stays secret, which is what makes it different from a patent, which must be publicly disclosed to be granted.
In Australia there is no single statutory definition of a trade secret, and no registration system to create one. Instead, a trade secret is a type of confidential information, and the law protects it through a set of overlapping legal routes. This article explains what makes information a trade secret, how the courts decide whether a secret is protected, how an owner can enforce their rights, and the mistakes that most often destroy a protection claim.
What the law means by a trade secret
Because there is no statutory definition, courts fall back on how the term has been used in decided cases. In Searle Australia Pty Ltd v Public Interest Advocacy Centre [1992] FCA 241, the Federal Court described a trade secret as a device or technique used in a particular trade or occupation that gives an advantage not generally known. That definition is broad enough to cover product formulas and details about customers, provided the information is in fact secret and would help trade rivals if it became known to them.
The label is not a strict legal category. In Del Casale v Artedomus (Aust) Pty Ltd (2007) 73 IPR 326, the New South Wales Court of Appeal observed that the expression "trade secret" is protean, meaning it is used in several different contexts and needs to be handled carefully. In GlaxoSmithKline Australia Pty Ltd v Ritchie (2008) 77 IPR 306, Harper J described a trade secret as a separate part of an employee's knowledge that a person of ordinary honesty and intelligence would recognise as belonging to the former employer, and not to the employee. Whether particular information is a trade secret is ultimately a question of fact in each case.
That matters for a business owner because it means there is no box to tick. Whether information is protected depends on how secret it actually is, how it was handled, and the circumstances in which it was disclosed.
The three features courts look for
The leading authority sets out the features that make information genuinely secret. In Searle Australia Pty Ltd v Public Interest Advocacy Centre [1992] FCA 241, the Federal Court held that a trade secret must meet three tests:
- the information must be used in a trade or business, not merely be a personal fact or an idea that was never acted on;
- the owner must limit how widely it is shared, or at least not encourage or allow public circulation; and
- disclosure to a competitor would be likely to cause real or significant harm to the owner.
Notice what these tests do not require. The information does not need to be novel, inventive, or completely new. It is usually enough that it has not moved into the public domain. In Ansell Rubber Co Pty Ltd v Allied Rubber Industries Pty Ltd [1967] VR 37, the Victorian court listed factors that later formed the backbone of how courts assess secrecy, including how widely the information is known outside the business, how widely it is known to employees, the measures taken to guard its secrecy, its value to the owner and to competitors, the effort and money spent developing it, and how easily a competitor could obtain or duplicate it.
How a trade secret is protected
There are two main ways Australian law protects a trade secret: through the equitable action for breach of confidence, and through contract.
Breach of confidence is the general protection that applies even when there is no signed agreement. In Moorgate Tobacco Co Ltd v Philip Morris Ltd (1984) 156 CLR 414, the High Court confirmed that relief can be granted against the misuse of confidential information. To make out a breach of confidence claim, a business must prove four things, restated in Optus Networks Pty Ltd v Telstra Corporation Ltd (2010) 265 ALR 281:
- the information must be identified with specificity, which means naming the particular documents, data, or details in dispute rather than claiming protection over everything at once;
- the information must have the necessary quality of confidence, meaning it is not generally known or accessible;
- it must have been received in circumstances importing an obligation of confidence, which includes situations where an employee or contractor was told or could reasonably understand the information was confidential; and
- there must have been an actual or threatened misuse of the information without consent.
Contract adds a layer on top. A confidentiality clause in an employment or services agreement makes the obligation to keep information secret express and easy to prove. A restraint of trade clause may also prevent a departing employee from using or passing on trade secrets in a new job, but restraints are scrutinised by the courts and will only be enforced to the extent they reasonably protect a legitimate interest such as a genuine trade secret.
A worked example
Consider a family-run manufacturer of gourmet sauces in Melbourne. The business has spent years refining a signed recipe for its signature hot sauce, negotiates favourable wholesale prices with a small group of suppliers, and keeps a detailed spreadsheet of which retailers, in what order and at what margin, it supplies.
The head of production resigns and joins a competitor. Within weeks the competitor launches a sauce that tastes very similar, at a lower retail price, supplied through the same retailers. The manufacturer wants to sue.
The first question is whether the recipe, pricing, and supplier list are trade secrets. The recipe is a classic trade secret: it is used in the business, kept in a locked office, shared only with the production manager under a confidentiality agreement, and its disclosure would clearly damage the manufacturer. The pricing and supplier list are also capable of protection as confidential information, along the lines recognised in cases such as Consolidated Paper Industries Pty Ltd v Matthews [2004] WASC 161 (pricing information) and N P Generations Pty Ltd v Feneley [2001] SASC 185 (customer and supplier details).
But the outcome will turn on the facts. If the production manager signed a clear confidentiality clause, was the only person with the recipe, and copied it before leaving, the manufacturer has a strong breach of confidence and breach of contract case. If instead the recipe was shared freely with every kitchen hand, taped to a noticeboard, and never marked confidential, the manufacturer may have lost the right to protection even though it calls the recipe a trade secret. The courts ask whether the owner actually treated the information as secret, not merely whether they now want to.
Common misconceptions about trade secrets
The biggest misunderstanding is that calling something a trade secret makes it one. It does not. In New Aim Pty Ltd v Leung [2022] FCA 722, a large online retailer sued a former senior employee who passed supplier contact details to a rival. The claim failed. The court found the retailer had not genuinely treated the information as confidential: it had no confidentiality agreements with its own suppliers, had not made clear to the employee that the list was confidential, and the contacts could be independently obtained. The retailer's belief that the information was secret was not enough.
A second misconception is that a trade secret must be highly technical, like a chemical formula. It does not. Customer databases, supplier lists, costing information, and pricing structures can all be protected, provided they are actually kept secret and are not simply part of an employee's general skill and knowledge.
A third misconception is that everything an employee learns on the job is a trade secret. It is not. In Faccenda Chicken Ltd v Fowler [1987] 1 Ch 117, the court distinguished a trade secret from the general skill and knowledge that a capable person necessarily builds up through work. An employee is entitled to take their own skill, experience, and the ordinary know-how of the industry to a new employer. Only information that is genuinely separate from that general knowledge and that the employee must recognise belongs to the former employer is protected.
A fourth misconception is that a signed confidentiality clause by itself guarantees protection. A clause makes a claim easier to prove, but courts will still ask whether the underlying information had the necessary quality of confidence. If the information was already public, or the clause was so broad it tried to lock up information the employee was entitled to use, it will not save the claim.
When you need a lawyer
Trade secret disputes are highly fact-specific and expensive to get wrong. A lawyer's first job is usually to help you work out, before a dispute blows up, what in your business is genuinely protectable and what is not. That involves auditing your sensitive information, deciding which items are true trade secrets, and putting in place the practical measures a court will look for: marking documents confidential, restricting access on a need-to-know basis, using confidentiality clauses in employment and contractor agreements, and considering reasonable restraints on departing staff.
If a breach has already happened, a lawyer can assess whether you can identify the information with sufficient specificity, whether it was received in circumstances importing an obligation of confidence, and whether there is evidence of misuse. They can then advise on the available remedies, which can include injunctions to stop the misuse, delivery up of copied documents, damages, and an account of profits. Getting the right advice early often means the difference between a claim that succeeds and one that fails at the first hurdle because the information was never properly treated as secret.
The step that decides whether you lose your secret
The single most common reason trade secret claims fail is not that the law is unsympathetic, but that the owner never behaved as though the information was secret. In case after case, including New Aim Pty Ltd v Leung [2022] FCA 722, the court lets a claim collapse because the business shared the information too freely, never marked it confidential, or never made clear to staff and suppliers that it was protected.
So the question worth asking about your own business is not "do I have trade secrets?" but "if a court examined how I store, mark, share, and restrict my sensitive information tomorrow, would it conclude I had been treating it as a genuine secret?" That is the assessment that determines whether the law will come to your aid, and it is the reason the company that actually protects its information, not merely the company that believes in it, is the one the law backs.