Because DRM ebooks from Amazon tend to be delivered in an incrementally more convenient way I'm not sure how DRM factors into this. I buy ebooks through Google

Because DRM ebooks from Amazon tend to be delivered in an incrementally more convenient way I'm not sure how DRM factors into this. I buy ebooks through Google all the time, and only a minority of them are DRM-protected. Yes as far as I can see, the distribution mechanism is identical whether DRM is in place or not. My understanding is that "put DRM on this book" is nothing more than a checkbox that the author chooses for the book.