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It's actually the other way around. This was the DRM mechanism for the "eReader" book format, which B&N acquired when they bought Fictionwise. B&N subsequently adopted this same DRM mechanism for their ePub books, and Adobe then added it as an additional DRM option for ADE. But nobody except B&N are currently using it and, the last that I heard, at any rate, B&N were still selling most, if not all, of their books in eReader format not ePub.
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