what model does Canada, and presumably other commonwealth nations follow? I suppose it is the same model as the U.S where the purpose of copyright is to foster

what model does Canada, and presumably other commonwealth nations follow? I suppose it is the same model as the U.S where the purpose of copyright is to foster innovation? That would also explain why it took so long to implement these changes, since this kind of thing seems to go against the purpose of copyright under the 'Innovation' model.