QC, I identify with anyone who loves trying to expand a series he/she is a fan of outward as far as possible, making it into as large and complex a fictional world as possible, while at the same time keeping it consistent. It's silly for anyone to lay down rules for other people, as to what is or isn't "canon". Any one of us can become Mr. Technical about it, citing this or that valid reason for calling "this" canon, and "that" not canon. and we'd all probably be right. We've all got good reasons, that conflict. Therefore it's up to us as individuals (or groups in the case of a club, maybe) to decide for ourselves what works for us as "canon". This is probably what I've heard referred to as "fanon".
What ticks me off is when legalities, meaning who owns copyrights and what those copyright owners have done with a show, are treated as the only legitimate authority to go by. Corporations often take over shows and manhandle them for quick profits. A corporation never had a creative thought or feeling... a corporation isn't even a person. Creative people bucking the system to get real quality on TV, that's who "owns" the show, creatively, screw legalities. #2 below the creators are fans. In spirit, fans own these shows far more than the corporations who buy them. Fans care, and keep the flame going, and are driven to keep the show's integrity intact.
We're at a point in history now when the shows with the biggest, longest lasting fandoms, (fandoms who kept the shows alive, "underground", and finally made it profitable to bring them back...) are now being drastically "re-imagined" for a mass market, to one extent or another. (DS, Star Trek, Dr Who) They're making us as fans have to decide something we've never had to decide before... whether we can reject new versions of our shows as not "canon", even though they are made by the official owners of these shows. I say we can. There are no rules for "canon" anymore. We each have to decide that ourselves.