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Another proposal (for way down the road)
Text to speech. It probably doesn't make sense financially to license it for general use, but you could partner with a TTS company and offer TTS as an in app purchase. The company will be selling access to their engine and voices through your app, and you get a cut of the purchase. (Most TTS companies have their own apps, but they usually have lousy epub reader and poor UI.). Your users who want TTS can get it; the rest can ignore. Win win win.
I think TTS is pretty useful sometimes, eg, when I'm too tired to read.
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