There are rules in the United States regarding patents, and to some extent they're different from those in Canada. But clearly the generics will be genericizing these products as well.
The one point I would make is that because of the laws that Canada had 20 years ago, it's thought that Canada is a generic-friendly legislative environment. In fact in the United States, as I mentioned, 67% of all prescriptions are now filled with generics. It's only 50% in Canada.