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Originally Posted by questionfear
Sony is using a general DRM that is not proprietary.
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It is proprietary, developed and controlled by Adobe. But being the only DRM scheme up to now, it's relatively widespread and "standard".
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So as long as Barnes and Noble supports generic ePub, they can read Sony books, but Barnes and Noble's special ePub locks their books to their software.
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Not "generic" ePUB, but Adobe's DRM for ePUB. The ePUB standard does not define a preferred DRM and in principle any company could develop its own DRM and it would still be ePUB-conforming. Adobe came up with the first DRM and any device that supports DRM ePUB in fact supports Adobe's DRM ePUB (because it's the only existing one). Now B&N have developed a different DRM, and the chaos will start
