Any way to sync ePub DRM books across devices?

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http://www.mobileread.com – Has anyone *successfully* been able to get ePub DRM books to sync across multiple Android devices? I have a phone and tablet, and I'm able to check out Kindle and ePub books from my library. I've been using Overdrive for the ePub books and read on my phone during the day and my tablet at night, but I still can not find any combination of eReader and cloud device to sync. I've tried using Dropbox to sync the ePub file since I couldn't find where the bookmarks are stored, but no luck there. I'd prefer not to covert or strip the DRM via Calibre. I've heard Aldiko used to be able to do this via (HowTos)