I vaguely remember reading somewhere a long time ago that on books that show "Delete" they can't do anything, but on the ones that show "Remove from device" the

I vaguely remember reading somewhere a long time ago that on books that show "Delete" they can't do anything, but on the ones that show "Remove from device" they can control your access to the book. This would mean, the only way to save your investment on the Kindle would be to strip DRM using calibre (or the unswindle tool) and transfer those copies to your Kindle. Well, obviously this negates the entire point if you have 3G but maybe you'd have to host stuff on your own private server if you want all your books available all the time.