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I would reiterate what rcuadro said. You can put any content you want on your Kindle that works with it. And as far as the warranty's concerned, you can convert any content in Calibre and then load it on to your Kindle. (Stripping DRM brings in legal questions, but it would have nothing to do with your warranty.) Now, if you were to load software on to your Kindle that let you read another format natively, that might invalidate your warranty (if they discovered it), but as long as you restrict your tinkering to outside of the Kindle itself, you should be safe.
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