The issue with these postcode databases is that once they're released to a customer there's no real way of tracking if they get reused elsewhere. The contract I had with the Royal Mail in the UK mandated destruction of all media and backups of the database once the contract period expired. As we know, getting individual tables out of old DB backups isn't necessarily easy but that's what the terms state. It's easy to see why they do that because it's not really a complicated "product" and very easy to duplicate.

That said, Canada Post should have tried to talk before litigation as all this does is make a crown organisation look like a bully in front of Canadians and now the world.