Don't know what ToasterMage did, but I got permission to use the translated text from the authors (Blue Gunner and insani), but the art and sounds were taken from the originals without TYPE-MOON's permission.
So I guess technically I'm 50% in the wrong, but, I didn't make my demos for profit, I only used some of the art and sounds (as opposed to all), and I didn't put their characters and universe in a negative light. I believe that's mostly how doujin
The problem right now is, is that people are able to freely get Tsukihime on DS, that is, if you finish it.
You won't ask any money for it, but you are giving people free copies of Tsukihime.
It's a hard case, but you'd better be careful about what you do, because, IMO, you're breaking a rule.
If I'm wrong, I'll take back everything I said, of course.