Quote:
Originally Posted by Fbone
Thanks for the info. In my case, the DRM was not removed after adding the books to Calibre even though I thought it was. The tools must have failed after install.
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That sounds like the most likely explanation - perhaps you didn't install a required tools update? It's easy to tell if it's worked or not: a Kindle book which hasn't been processed by the tools will have a file type of "AZW", while one which has been processed will be either "Mobi" or "AZW3", so if you filter your Calibre library by file type and find "AZW" books, you have a problem.