Suppose I download a PDF file of a book (one that is undisputably in the public domain, like a mid-1800s Bible). The PDF is created from source files using a combination of automated conversion and manual typesetting/editing. Various versions and excerpts (of both the same source and of this particular file) exist elsewhere online.
The file's text itself does not contain a copyright notice, just an original publishing date and a request to update the PDF file maker if errors are found.
I would like to make a few changes to the work and publish it as a hard copy book. Is there any legal concern with doing so? Would I need to include their PDF notice?