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Yes, Calibre is on the same machine as my Adobe Digital Editions.
I was able to confirm that if the book can be viewed in Calibre, there is no DRM. I have a few Kindle books (prc files) that I bought before dropping Kindle for Kobo. So I tested with a Kindle book. I added the prc file to Calibre. The book was added like any other book but when I click to view the book, it would not show the cover page and prompt a message saying the book is DRM protected. The epub that I added is from Kobo and is Adobe DRM epub (according to Kobo website) and since it let me view the book in Calibre, I think the DRM was removed the minute I added the epub into Calibre. Wow,it turns out to be easy..
Some observations about the files:
In Adobe Digital Editions, the book has the following files:
- Black Skies.epub
- Black Skies.epub.annot
- Black Skies.epub.xml
- Black Skies.epub.png (image file for front cover)
I copied only the Black Skies.epub to a temp folder and added the file from the temp folder into Calibre.
Calibre has the following files:
- Black Skies - Arnaldur Indridason.epub
- cover.jpg
- metadata.opf
Seems to me that the only file that matters is the epub file (Black Skies.epub). The rest of the files are "auto generated" by the respective software.
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