Absolutely no mystery.
The CyBook is a Netronix EB600, for which Bookeen write their own firmware.
The eSlick is also a Netronix EB600. I don't know if they are writing their own firmware, or using the standard Netronix version.
There are lots of other EB600's out there too, eg the Cool-ER and a few others whose names escape me.
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