Hello,
Just to let you know that since December, 1st, editors must provide at least a non proprietary format for ebooks. While it's written in one of the lowest level of laws, it applies to everyone.
We may see things change a bit in the coming months on online stores.
Sources for French readers: http://www.legifrance.gouv.fr/affichTexte.do?cidTexte=JORFTEXT000029966188 http://www.legifrance.gouv.fr/affichTexte.do?cidTexte=JORFTEXT000029750455&a...
Best regards, Jil