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I'm guessing they are complaining about the "book producer" field in the metadata. If so, they need to be taken out and summarily shot.
Open up the opf inside your epub and look for a line that look likes this
<dc:contributor opf:role="bkp">calibre (0.8.16) [http://calibre-ebook.com]</dc:contributor>
remove it and see if it makes them happy. And if it does, tell them from me, that they're morons.
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