An interesting case that occurred because of Canada being 50 years rather than 70:
Ian Fleming, creator of James Bond and Chitty-Chitty Bang Bang, died in 1964. That means that in most of the world, his works go out of copyright in 2034. But in Canada, they are already Public Domain, since 50 years puts the date in 2014. So, shortly after that happened, Canadian book chain Indigo-Chapters put out their own cheap hardcover editions of the original James Bond series and a bunch of Canadian authors released an anthology (only available in Canada) of James Bond short stories. But these could not be sold outside Canada since Bond was still in copyright in the US, UK, etc.
It is tricky, though, because it only covers characters, settings, plot elements, etc. from Fleming's original novels. So, for instance, the popular villain Jaws is not included because he was created by screenwriter Michael Wood for the movies The Spy Who Loved Me and Moonraker in the seventies. Basically, if you're Canadian and going to write a Bond story, make sure you read Fleming first, so you know exactly what is available to use.