Just use Calibre, and you can ignore Format Locking.
I returned the Odissey. The Paperwhite is just better : faster, better light control, and a better display, dictionary is well integrated (and handle several languages), better built (I tend to read on the side, with my hand weighing on the e-reader 's side : the cybook is painfully edgy). It just does not have any physical buttons, but that's not as much a problem than I thought.
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