I am in the process of finishing up a book which I anticipate will be published in the United States.
For the book's cover, I would like to make use of a font that is freely downloadable; and, as far as I can tell, does not forbid commercial use. In this case, I would like to make use of a font available from https://www.schäffel.ch/de_gruppe1.html.
Now, I say, "as far as I can tell", for German is not my native language, and although I did not determine that "commercial use" is forbidden, I also did not detect anything along the lines of "free for commercial use."
QUESTION: Would using a freely downloadable font for a book to be published be considered as "commercial use"; and if so, may I legally use a font in that book (without reprisal) from a foreign site, which again, "as far as I can tell", does not seem to forbid it?