Fonts for Book Cover

Assuming that you are creating a PDF file of the book cover for the publisher with fonts embedded for them to print (i.e., they aren't doing additional design work or adjustments), you are within the license for Adobe Fonts.

However, if you are sending a source file (Illustrator, InDesign, etc.) to the publisher, they will either need to have an Adobe Creative Cloud license that supports Adobe Fonts or they will need to license the fonts themselves.

          - Dov