[profgubler]

Actually, I would believe you could have had that even if it was in copyright, as it would be considered parody. Would it not?

[nitrogen]

It probably depends on how much of the original text and plot were used in the parody. It would certainly be considered illegal to write Harry Potter and the Zombie Hallows now, just by virtue of using the same characters as the original.

[ootachi]

Depends. Parody is covered under fair use in the United States and is subject to the same test used to determine fair use.