The case here is not one of taking thing from the public domain and putting them under copyright (as happened, for example, when the copyright terms were adjusted to match the rest of the non-US world), but rather, a dispute about what is in the public domain and what is copyrighted.
The crux of this case is whether the attributes added to the film adaptation of a work of literature (not present in the work of literature) have a separate copyright term running from the release of the film (and not from the original publication of the book.)
grellas, am I reading this right?