if the publisher uses Calibre to make the eBooks (like Baen) then you will see Calibre classes. If you see Calibre classes on eBooks where the publisher does not use Calibre, then stop downloading eBooks that you did not pay for. If these are legally obtained retail eBooks, no matter how the publisher makes the eBooks, you will see the classes and CSS as it was released. If you have a Mobi (AZW) eBook, don't bother to look at it as there is no CSS stylesheet because it's all inline andrather a mess to try to examine it. KF8 (AZW3) and ePub are fine as they do have CSS.
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