Canon in the precise sense of Star Trek. I thought you might have picked up on that, given the context.
What I mean is, "canon", as it gets thrown about in these here parts, is a largely fan-created/perpetuated thing. The creators rarely (if ever) bother to say "this part is real, this other part is made up" ...it's all as real as they decide it is on any given day. They declare a computer game or comic "official!" on one day, and ignore it completely the next. (Which I have no problem with.)