Rowling's copyright is legally binding when she so chooses to enforce it. She has allowed an abundance of other Harry Potter guide books to publish because they fall under fair use. In fact she verbally endorsed one of them from the Leaky Cauldron's latest article about what happened in court yesterday. Bad fan or not doesn't matter, I agree with that. But that's all being part of RDR's defense that JKR has had to repeatedly respond to. I believe that JKR has adequately proven that Steve's book doesn't fall under fair use.