From what I can gather, an .acsm file doesn't actually contain a ebook. It just contains a link that Adobe Digital Editions uses to download an ebook from Adobe's servers. I don't think that a free software program could download the ebook unless it was capable of making itself appear to be a copy of Adobe Digital Editions. That ebook *would* have DRM, and there might be free software capable of removing it, but I can't find any free software that can download the ebook in the first place using the .acsm file.
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