Quote:
Originally Posted by mobilemoxie
Any book you purchase from Amazon MUST be opened in an Amazon Kindle app, whether that's on your PC/Mac or other device that runs the Kindle software. It is the opening of the ebook in the Kindle app that 'sets up' the ebook and gives it the initial permissions. Without this step, Calibre won't be able to work with the file. This step is important for #3 below.
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Not at all. I've never opened any downloaded book in the Kindle app, and have never had any problems with Calibre or Alf's tools.