The latest details of Amazon’s forthcoming Android app store focus on digital rights management (DRM), indicating how the firm will differentiate itself from Google’s Android Market, while tying users into the real heart of its business model, its cloud service. It promises a ‘digital locker’ which largely mirrors the structures of its ebook platform Kindle. Indeed, the similarities to Kindle have led some to speculate that Amazon will go a step further and launch a device for its new service, probably the long rumored Android tablet. With or without hardware, the store will support the ‘buy once, read anywhere’ concept of Kindle. Buyers will be able to use an app across any Android device they register to the service, and…