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I'm trying to understand the DRM status of a bunch of Kindle books I've purchased and imported to Calibre, and the behaviour of the ebook-viewer app.
Working with book files from Amazon's soon-to-be-deactivated download-and-transfer page, it seems to me that ebook-viewer can decrypt the DRM even outside the Calibre library app if I have the DeDRM plugin installed and active.
Clever, if this is what it's doing. I had assumed that ebook-viewer as a standalone app would need a book file that had already been decrypted. So it does leave me wondering if my hundreds of previously-downloaded books that I purchased are actually de-DRM'ed, or if they are simply decrypted on the fly when I run ebook-viewer.
Hope this makes sense? I'd like to verify that my hard drive is full of decrypted books that I can open on any of my own devices, rather than needing Calibre installed with the plugin and the Kindle key. I don't tend to keep hundreds of books in the Library, I organize them in file system folders. Is there any way, preferably on CLI, preferably Calibre-native, that I can explicitly list the DRM status of a large number of ebook files? I've not so far had a problem on other devices, but it would be annoying to find out later that I had a number of files that were not actually decrypted, if for some reason I had messed up with my local setup at any time.
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