Copyright almost certainly doesn’t help here — secrecy and your vendor’s contract terms do the real work.
Short answer
Rarely, and copyright is the wrong place to look for it. A short prompt seldom clears the originality bar the Copyright Act sets for a protected work. What actually protects a genuinely valuable prompt is keeping it confidential, or the contract you signed with the AI vendor — not copyright.
Copyright subsists in “every original… literary… work” — and a two-sentence instruction rarely carries enough original expression to qualify, the same way a single ordinary sentence usually doesn’t attract copyright on its own. An elaborate, carefully structured prompt library — many worded instructions, examples and formatting rules assembled into a substantial document — has a stronger claim than a short one-line instruction, simply because there’s more original expression in it to protect.
Treat a genuinely valuable prompt — a finely tuned system prompt that took months to refine — the way you’d treat any other trade secret. The underlying doctrine doesn’t require registration: information “has commercial value because it is not generally known or readily ascertainable,” and protection lasts only as long as you actually keep it secret — through access controls and confidentiality agreements with staff and contractors, not a filing.
The other place this actually gets decided is your AI vendor’s contract. Canadian law “doesn’t generally treat raw data the way it treats physical property or even intellectual property like a copyright,” and a data-ownership clause in a platform agreement should explicitly address “the outputs the software generates” — which is exactly where your prompts and the outputs they produce fall. Whatever that clause says usually controls in practice, regardless of what copyright law would say on its own.
For an everyday prompt, don’t bother chasing IP protection — nobody could stop you reusing it anyway, and the law gives you little to enforce. For a genuinely valuable, heavily refined prompt or prompt library, protect it as confidential information internally and check what your AI vendor’s terms actually say about who owns inputs and outputs, because that contract — not copyright — usually decides the question.
This connects directly to whether an NDA can stop you from using AI in the first place, and to the broader question of whether AI-generated output is copyrighted in Canada.
See how ownership of custom AI assets gets locked down before a build.
