Not exact matches
Wherever you bought your Adobe DRM ebook from (Kobo, Sony, Google,
etc) there will be an option to
download it to your computer if you login to your account and view your
library.
To add a DRM protected ebook to your Calibre
library,
download the protected file with the appropriate client software if necessary (Adobe ADE, Sony Reader software,
etc), locate the file, and import it into Calibre like any other book.
From their website: calibre has a cornucopia of features including
library management, e-book conversion, syncing with devices, news
download, e-book viewing
etc, but to make the most of these features with your e-books you need to ensure your e-books do not carry DRM.