I just received my thread subscription email and noticed that I missed this statement:
Quote:
Originally Posted by aessedai44
Hi
I understand that amazon only like you to use their books from their store.
Paul
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Whilst Amazon may, as a commercial entity, prefer that you buy books from them

, they in no way restrict non-DRM books from other sources as long as they are in the right format (mobi, prc, pdf, txt, html with a .txt extension).
Non-Amazon books are treated exactly the same as Amazon books, except they are not on the Amazon cloud and annotations and bookmarks are not backed up on the Amazon server. They can be added to collections, searched, annotated, highlighted etc etc.
My K2 (and soon K3) has heaps of non-drm books from other sources, many of them free. I use Calibre for converting to mobi if necessary and then transferring to the Kindle - love it!