Actually, Marlin DRM used by Sony is supposed to work like that - i.e. you'd be able to move your content between any devices registered to you (like it's done now for PCs and Readers). The problem is, that DRM is supported only on Reader and PC right now...
The full standard even has provisions for moving license from one user to another, converting to a different DRM provider and so on, but I doubt it's implemented.
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