Metro-Goldwyn-Mayer Lion Corp. applied for a trade-mark to protect the distinctive lion’s roar used by it in the opening credits at the movies. The trade-marks registrar said no; sounds aren’t eligible for trade-mark protection. This was reversed by a brief order of a prothonotary of the Federal Court: Metro-Goldwyn-Mayer Lion Corp v AG Canada, docket T-1650-10 (1 March 2012).
In response, the Canadian Intellectual Property Office has announced that it will now accept applications for sound marks.
[Link available here].