DPS ('Digital Publishing Suite') is Adobe's magazine publishing solution for creating interactive content for mobile devices. In this model users download a free, branded app to download content and purchase subscriptions or individual issues. The app handles in-app purchasing for the platform in question (Apple, Google Marketplace, and now Amazon Marketplace).
"Wired" magazine currently uses this on iOS, and was one of the 'interactive' magazines called out in the Amazon announcement for the Fire, so I'm kind of assuming this is the technology they'll be using for that. By using an app, the publisher gets a more direct relationship with subscribers than they can have through things like Zinio or subscriptions managed entirely through the platform provider's generic Subscriptions system (though the platform provider still gets paid).
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"DPS product management team is already working on supporting the new Amazon device. Adobe AIR for our Android Content Viewer and that made it easy to customize it for Amazon’s device, as well as giving Kindle Fire customers access to their other favorite AIR applications. We added support for their Amazon Marketplace Payment APIs"
http://blogs.adobe.com/roger/2011/09...s-morning.html