While you acquire a book a book on Amazon is DRM, which is proprietary software that limits what we can do with the book. If you acquire a paper book, you can do something with it. You can lend a friend or give it away. The DRM notifies you what you can act with the Kindle book. You may not be able to listen to your book if this feature is disabled. If the publisher sells the book in audio form, can be the editor to be sure that it will implement this restriction. As well, the DRM can disable the loan.
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