This is more about 'enterprise' DRM than 'consumer' DRM, e.g.:
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				Bluefire, for example, is using Sony DADC DRM in its new CloudShelf "shared library" service. This is not a retail platform but instead is a way for an organization to create and manage a shared library of ebooks which can only be accessed by its members. (The service is in beta. Contact Bluefire for more info.)
			
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 In such environments, they need a more robust (and cost effective) solution than what Adobe offers.