A long time ago I worked for Amazon, coding on Kindle in various platforms. I'd been using ereaders like Kindle for years, but I'd never once electronically pur

A long time ago I worked for Amazon, coding on Kindle in various platforms. I'd been using ereaders like Kindle for years, but I'd never once electronically purchased a book and had no interest in doing so. I was amused to find that at Amazon it was taken for granted that the only way to use the reader was to buy a book. When I mentioned all of the stuff I'd put onto Kindles over the years, my colleagues blinked at me and said, "You mean you SIDELOAD?" as though that were the oddest, most puzzling thing imaginable. There are endless legal sources of non-DRMed ebooks online. They aren't hard to find. I don't recommend anything else.