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			Calibre does not change the source in a From > To conversion OTOH If you process (convert ) to the same type, it does.
 Depending on your settings, you may have an original_xyz in the formats area of the MDE
 
 Also Calibre remembers the settings used for each conversion (you can adjust them at the conversion start). Note the button at te bottom: That grab the latest Preferences (your default)
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