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I'm not entirely certain, but from what I've been able to gather, CS5 can only be set to either deliver only the old DRM for newly authorised ebooks (to both RMSDK9 and the new RMSDK10) or to deliver only the new DRM for newly authorised ebooks (to RMSDK10 only).
It seems that this is an either/or switch, and it's not possible for CS5 to deliver new DRM to RMSDK10 and old DRM to RMSDK9 (for newly authorised ebooks).
So my guess is that it's going to be a year or so before any reseller is bold enough to flip that switch, and stop selling to all the old RMSDK9 devices.
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