Show me the Canadian law that defines the downloading of music for personal use as theft.
My hypothetical is revealing that you are using law to define your opinion on ethics without critically thinking about the value of those laws. If your views of copyright were a long-standing view, it would be illegal to perform any of the classic symphonies without the permission of their composer's great-great-great-great-etc grandchildren, for example. Or Disney would not have ownership of several intellectual properties that they currently claim to have. I see the value in protecting intellectual property, but it's not a matter of theft, it's a matter of creating an environment that allows creators of IP to be rewarded via the marketplace, and encourage further creation of IP. That is explicitly what the US constitution spells out on IP law, although today it has been distorted to mean the protection of even music long past its release.
Also, copyright doesn't necessarily have to be "secured"; copyright is assumed given by anyone that creates intellectual property. Registration of copyright makes it easier to prove ownership, especially when talking about idea-"theft" (e.g. law suits over similar melodies between popular songs), but isn't necessary to simply establish copyright.