Just open View on the book (if you have 1,200 books, do it while listening to an audiobook). If the View doesn't open, it still has DRM. I made the mistake of not checking a lot of my freebees from 2012 and 2013 that I was deleting from my bloated Amazon account. I had 200-300 of them that still had DRM. Fortunately, a few that I still wanted to keep (maybe 6), Amazon customer service restored to my account and I redownloaded. That was a lesson to check every single one.
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