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Originally Posted by Daithi
I don't see the point of a new standard either. As long as the book is purchased through Amazon they could use a software solution that would handle deleting expired books, and they wouldn't need to use a custom file format to accomplish this task. When you download a book with an expiration date you just update a database on the Kindle that records when the file should be deleted.
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I don't think you're quite understanding... what you've described is exactly what Amazon has delivered. It's a standard PDF. The mobi (azw) container that it's embedded in is mainly functioning as a DRM vehicle—which will use Amazon's pre-existing DRM system (No new custom DRM software expenditures) to apply time constraints to PDF rentals.
I'm not backing Amazon's decision, just trying to stress the fact that there really is no "new format" here. PDF inside a MOBI. The only thing new is the application necessary to read it.