I am hardly an expert on the subject of Amazon's DRM (Digital Rights Management) for Kindle. No doubt others who are will weigh in. But my purpose on this blog is to pass on wisdom I had to learn the hard way, and here is today's lesson:
DRM is controversial and unpopular and there are people who will not read your books on Kindle if DRM is set. How many? That's for the experts. What I can tell you is that you cannot casually go back and uncheck DRM. You must go back and unpublish every title you want to fix, then resubmit them as brand new books from scratch.
I just got back from doing that.
So decide how you feel about DRM before you publish on Amazon!