Your client is crazy. If the ePub is written correctly, you do not need to convert it. When you do these sorts of conversion, you risk causing a problem where a problem didn't originally exist. Plus, you risk making the code messy where it may have been neat. Why is your client doing conversions from the ePub to ePub? Is something wrong with the original ePub? Does it fail on nook or Kobo?
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