For Book titles, protection of we have a term and definition in Trademark.

Book titles are generally not protected under trademark law unless they are part of a series. However, even if the title is not of a book belonging to a series, it may theoretically receive trademark protection as long as the title is used in the manner of a trademark and has acquired secondary meaning. Secondary meaning is also required if the title of the series itself is descriptive of the general contents of the series.
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