My question concerns the author Ben H. Winters who has recently published several books with himself listed as Jane Austen’s co-author. Sense and Sensibilities and Sea Monsters is one such novel adapting Sense and Sensibilities to a horror theme. Winters puts his name after Austen’s on the cover and in credits.
I would like to know if this is giving obligatory credit to the author of his borrowed content, or violating a copyrighted claim of another author. The copyright has lapsed, but does anything speak to protocol in crediting deceased contributing authors?
For example, if I were to place Mark Twain’s The Innocents Abroad into an alternate universe, keeping a very large part of his dialogue, but perhaps moving his 6-month promised land steamer cruise in 1859 to a Martian space cruise in the year 2359, would I need to claim co-authorship with Mark Twain?