What is actually licensed in print/digital dual-licensed books?

I have recently published a book chapter (on Shadow Libraries) in a very fine collection that was published in print in January and digitally just now, in June. The digital edition contractually promises to be open access with a CC BY-NC-ND license (yes, I know, the hardcore OA crowd are baying “that’s not open access” etc. but I really liked the book concept and wanted to write for it etc.).