The bookcover function on Calibre actually only loads onto the reader if the book is DRM free. Covers are a big problem for all readers--and it is not the fault of the device. Just as authors often have rights sold region by region, so often do the artists that create the covers. So, for example, the publisher may have the right to display the cover art for sales/marketing anywhere, but not to actually sell the cover art as part of the ebook.
|