I don't think you can claim to own a plot and a hash is less than a skit or a plot point. Infinitely less in fact because whereas even a single character on a page is some small fraction of the work a hash is a nothingth of the work. It can not be used to reproduce nothing. It is data about the work.

Someone already came up with the correct analog. Its metadata like the ISBN or number of pages. Both datum are in fact derived from the actual work but nobody argues that the number of pages is a derivative of the work.