Your question implies you dont trust calibre. Which in turn implies you dont trust the people that make and release it. What on earth is the point of asking them what calibre does if you dont trust them. Read the source code, or use a network packet sniffer.
And fortunately, I am not a corporate PR department so if someone implies on a public forum that I am doing something underhanded I feel absolutely no obligation to be polite to that person.
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