Here are the promised disclaimers for the non-Potter fandoms I'm likely to write. I've probably missed a media production source or two with the Whedon stuff, but the main ones for the shows and comics are covered.
Buffy the Vampire Slayer belongs to Joss Whedon, Mutant Enemy, 20th Century Fox, and Dark Horse Comics.
Angel belongs to Joss Whedon, Mutant Enemy, 20th Century Fox, and IDW comics.
Firefly belongs to Joss Whedon, Mutant Enemy, 20th Century Fox, and Dark Horse Comics.
The Vorkosigan saga belongs to Lois McMaster Bujold and Baen.
The Black Jewels 'verse belongs to Anne Bishop and Roc.