IANAL and OP may be able to answer you more fully, but in case they don’t get a chance to, Trademark shouldn’t cover the functional layout of Bolding and Parentheses. It would only apply Donna summer singer shirt if you specifically copied say all the unique font and borders and colors and tried to make your book look like Necrotic Gnome’s work to the point where they could contend that you were trying to basically trick consumers into buying your product thinking it was an NG product.
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No one has the protected IP or trade dress of bolding things, or putting things in parentheses, or any combination Donna summer singer shirt . Honestly, I don’t think there is anything about the Winter’s Daughter layout that is unique enough to really count as trade dress as long as you aren’t stealing the entire color scheme, backgrounds etc. whole sale. Hopefully OP can clarify a little more for you so you don’t just have to take my non-legal word for it.