As I said... a DRM protected book can ONLY be downloaded via ADE; NOT via Calibre. ADE uses the ACSM flle to download the DRM protected book.
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When you buy an ePub that is protected by DRM (Digital Rights Management) you will download an ACSM file. This is not the actual book; rather it is instructions to ADE to allow IT to download the book to your PC.
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