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I think all of them for "full functionality".
Kobo will perhaps have less problems since (IIRC) the rendering package for kepub doesn't use RMSDK, but for sideloaded "full epub" ebooks it uses it.
But I think all of the others (that I know) use RMSDK for all the reading.
For Sony, who doesn't regularly update its firmware, it could be quite problematic.
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