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Anyone may do as they wish with public domain sources. You can add value to entice people to buy your version instead of downloading the free version. For example, and interactive table of contends, illustrations or commentary. I read Dante's Divine Comedy, and while I could have obtained the text for free, I wouldn't have been able to understand it very well without commentary and footnotes. The text was public domain, the commentary and footnotes were not. Selling public e-books can be tough, you really have to persuade the reader that you're offering added value.
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