I don't think there is an answer. I've seen non-drm books with and without it. The very few that I've purchased don't, but it's always up to the publisher of the ebook. It has nothing to do with the format itself. I'm sure there are some books that have it.
You can usually preview a book before you purchase it from the mobipocket store. That will show you how it's formatted, and give you your answer.
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