I've moved this out of Everything Else as it contains too much potential for spoilers. I've also spoken to Kc about it and it's ok that its happened, but I would suggest in the future before you modify and republish anything that belongs to someone you should probably seek out permission first.

Pardon me while I put on my Gryffidor Scarf: There's a website dedicated to everything and all things, The Harry Potter Lexicon, and they produced and published an encyclopedia. This is a site that had all the blessings in the world from JK Rowling when it was online, she linked to it on her website, gave them awards for their dedication to the story, but once they published the encyclopedia they ended up in court being sued by Rowling and her publisher.