Dropbox has acquired the iOS (s AAPL) and Android (s GOOG) ebook reading app Readmill, and the app will be shut down. Readmill confirmed the news on its blog Friday following a TechCrunch report Thursday.

Readmill was a Berlin-based startup that had become popular for the clean, streamlined ebook reading service it provided; its support for Adobe (s ADBE) DRM meant readers could buy ebooks from platforms like Kobo and Nook (s BKS) and then read them on Readmill’s apps. In recent months, Readmill had added a book discovery feature and partnered with the Guardian, the Atavist, startup Livrada and nearly 100 other independent publishers and digital bookstores to let them sell ebooks directly through their websites.

That’s not the part Dropbox was interested in, though. Readmill’s technology also allowed users to share and leave notes for each other within ebooks and it sounds as if that’s the reason for…