We haven't really defended any patents in Canada, because our U.S. colleagues were fortunate enough to get, or apply for, patents in the United States.
In our world, it's not as much a patent issue as it is an evidence-based intellectual property issue. For instance, we have a way of stratifying people into low, moderate, or high risk that is built into our programs. No one knows what the algorithms are, but the programs put people into the right brackets. This is why corporations like Chevron in the United States use INTERxVENT. We offer programs to their employees in twelve countries and six languages. It's just because they're better programs. We don't really have patents.