"No, Canadian copyright laws do not require marking a work with the copyright symbol (©) for the work to be protectable. Nonetheless, there may be some benefits to marking your works with the copyright symbol. For instance, the copyright symbol serves as a deterrent and a reminder that copyright is being claimed in the work. In case of a lawsuit, the copyright symbol could also be used as evidence against an 'innocent infringement' claim. Additionally, since there are some jurisdictions that do require works to be marked, it may be a safer option to mark the works with the copyright symbol when using them online or in a foreign jurisdiction."
A Guide to Copyright. Canadian Intellectual Property Office, 2019