Canadian NDA Guide: Drafting an Enforceable Non-Disclosure Agreement

A non-disclosure agreement (NDA) — also called a confidentiality agreement — is a contract in which one or both parties agree to keep specified information confidential and not to disclose it to third parties or use it for unauthorized purposes. NDAs are used in a wide range of commercial and employment contexts across Canada: before sharing business plans with potential investors, in mergers and acquisitions due diligence, when engaging contractors, and in employment relationships. While federal and provincial contract law applies uniformly to contracts entered into in Canada, the specific enforceability analysis for NDAs involves some provincial nuances. This guide focuses on drafting an NDA that will be enforceable under Canadian law.

Provincial vs. Federal Enforceability

Contract law in Canada is primarily provincial — each province's courts apply their own common law (or civil law, in Quebec) to interpret and enforce contracts. The key enforceability principles are similar across common law provinces: an NDA must be supported by valid consideration, must define its subject matter with sufficient certainty, and must not be unreasonably broad or contrary to public policy.

In Quebec, the Civil Code of Quebec governs contracts — the principles of good faith, proportionality of obligations, and the prohibition against abusive clauses apply and may give Quebec courts broader latitude to reduce or set aside excessive NDA provisions. If your NDA may be subject to Quebec law, ensure the confidentiality obligations are proportionate to the legitimate business interests being protected.

Defining Confidential Information: Must Be Specific

The most important drafting decision in any NDA is the definition of "Confidential Information." A definition that is too broad ("all information shared between the parties") is often unenforceable because it lacks sufficient certainty and may be found unreasonably restrictive on trade. A definition that is too narrow may fail to capture the specific information you actually want to protect. Best practice is to:

• Define "Confidential Information" to include specific categories relevant to the disclosure: trade secrets, proprietary formulas, customer lists, pricing data, business plans, financial projections, technology source code, etc.
• Include a general catch-all after the specific categories: "and any other information disclosed by the Disclosing Party that is marked as confidential or that a reasonable person would understand to be confidential given the nature of the information and the circumstances of disclosure."
• Consider whether oral disclosures should be covered — if so, require the disclosing party to confirm oral confidential disclosures in writing within a specified period (e.g., 5 business days).

Standard Exclusions from Confidentiality

Every well-drafted NDA should include standard exclusions — categories of information that are excluded from the definition of Confidential Information even if they would otherwise qualify:

• Prior knowledge: Information that the receiving party already knew before the NDA was signed (and can prove it through documentation).
• Public domain: Information that is or becomes publicly available through no fault of the receiving party — e.g., if the information is subsequently published or patented by the disclosing party.
• Independent development: Information independently developed by the receiving party without reference to the disclosed information (requires documentation of the independent development).
• Third-party disclosure: Information lawfully received from a third party who had the right to disclose it without restriction.
• Legal compulsion: Information the receiving party is required to disclose by law, court order, or regulatory requirement — typically with a carve-out requiring the receiving party to give prior notice to the disclosing party to allow them to seek a protective order.

Remedies: Injunction, Damages, and Accounting of Profits

The typical remedies for breach of an NDA in Canada are:

• Injunction: The most powerful remedy — a court order requiring the receiving party to stop the unauthorized use or disclosure. To obtain an interlocutory (temporary) injunction pending trial, the disclosing party must show a strong prima facie case, that damages would be inadequate, and that the balance of convenience favours the injunction. NDAs typically include a clause stating that breach will cause irreparable harm for which damages are inadequate — this supports the injunction argument but does not guarantee success.
• Damages: Compensatory damages for loss suffered as a result of the unauthorized disclosure — the disclosing party must prove and quantify their loss. In commercial NDA breaches, this can include lost business, damage to goodwill, and costs of mitigating the breach.
• Accounting of profits: An equitable remedy requiring the breaching party to disgorge the profits they made as a result of using the confidential information. Particularly useful where the breach results in the receiving party making a profit (e.g., using proprietary technology to win a contract).

Mutual vs. Unilateral NDAs

NDAs come in two basic structures:

• Unilateral (one-way) NDA: Only one party discloses confidential information and only the receiving party has confidentiality obligations. Used when one party (e.g., an employee or a contractor) is being exposed to the other's proprietary information but not vice versa.
• Mutual (bilateral) NDA: Both parties will disclose and receive confidential information, and both are bound by confidentiality obligations. Used in M&A due diligence, partnership discussions, or joint venture negotiations where both parties are sharing sensitive information.

Mutual NDAs require careful attention to symmetry — if the obligations are not truly mutual (e.g., one party is disclosing far more than the other), the receiving party may later argue the agreement is one-sided and seek to limit its obligations accordingly. Where the disclosure is genuinely asymmetric, a unilateral NDA may be more appropriate.

Limitation Period for NDA Breaches

Under Ontario's Limitations Act, 2002 and equivalent provincial legislation across Canada, a claim for breach of an NDA is generally subject to the standard 2-year limitation period from the date the breach was discovered (or ought reasonably to have been discovered). However:

• In practice, NDA breaches (particularly unauthorized use of trade secrets) may not be discovered immediately — the discoverability principle means the clock starts when you knew or ought to have known about the breach.
• Perpetual ultimate limitation periods (15 years in Ontario) apply regardless of discoverability.
• In Quebec, the limitation period is 3 years for personal claims and 10 years for certain other claims under the CCQ.

Choice of Law and Forum

Canadian NDAs should include a governing law clause specifying which province's law governs the interpretation and enforcement of the agreement, and a forum clause specifying where disputes will be resolved. For a business in Ontario, using Ontario law and the Ontario courts (or binding arbitration in Ontario) is standard. Key considerations:

• Choose the law of the province where the disclosing party is located or where most of the confidential information will be used.
• If the parties are in different provinces, consider which forum has the most connection to the business relationship.
• For international NDAs (where one party is outside Canada), consider whether the foreign law or Canadian law provides better enforcement tools for your specific circumstances.

Post-Employment NDAs

NDAs in the employment context have specific enforceability considerations. A post-employment NDA (one that restricts disclosure after the employment ends) must be:

• Reasonable in scope — protecting genuinely confidential information, not attempting to prevent the employee from using their general knowledge and skills.
• Time-limited — perpetual post-employment NDAs for general information are unreasonable and courts may strike them or reduce the duration to a reasonable period.
• Supported by adequate consideration if signed after the employment has already begun (promotion, raise, or bonus — not just continued employment).