It wouldn't require any change in Amazon's DRM schema. It would only require a change in their servers (to offer the option) and possibly the Kindle for ... software (to allow easy indentification of a particular software installation).
At present there is a provision to allow you to download on any computer a DRM's file tagged for a particular Kindle device. The file can then be sideloaded onto the device and read.
What's missing is the ability to select a registered Kindle software application (Kindle for PC, Kindle for Mac, ...) as the target of the download's DRM. The only way currently available is to download directly from those application.
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