Quote:
Originally Posted by Ahuka
I have e-books that I bought on Amazon Kindle, Barnes and Noble Nook, and Kobo, plus ones that I bought as files I downloaded to my computer. Now that I am trying to organize it all, I may have made a bit of a mess. What I mostly want to know is whether I own a book, and where it resides. Is there a good software program for that kind of management?
Thanks,
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In a word: calibre.
https://calibre-ebook.com/
There's an active Calibre forum here on MobileRead.
Also look at
https://apprenticealf.wordpress.com/, for information about DRM and what to do about it.