Quote:
Originally Posted by Jo69
But can you help me understand why the books download in the old format, to still load into Calibre. But Amazon downloded them in a new format into the My kindle folder?
What makes it do that?
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Your question is not clear to me, but I will try to answer anyway.
A couple of years ago Amazon introduced a new e-book format, KFX. Since then they have been implementing new features in their reading software in conjunction with this format. This includes enhanced typesetting, page flip, fast manga reading, interactive textbooks, and kindle in motion. They deliver books in the new format to support these features.
KFX also has a new DRM scheme and even without DRM would be much more difficult to work with than the older formats due to its design. It can be rendered quickly, but will be difficult to convert to more standard formats. The added lock-in to Amazon that results is an advantage to them.
All of the e-book software, such as calibre, that allows you to work with your books outside of the Amazon kindle ecosystem makes use of Amazon's older and (relatively) more open e-book formats. Support for KFX may come some day, but it is best avoided as long as there is a way to do so.