Kindles can read a variety of non-proprietary, non-DRM'ed formats. They read TXT, HTML, JPEG, and non-DRM Mobi files directly.
DRM is not to prevent other files from being readable on the Kindle.
Granted the PDF converter seems to have some trouble with graphics PDF's, but for books the converter works very well.
The Kindle DRM wasn't hacked to REMOVE the DRM from Kindle purchases, but added to other books so that they too could be read on the Kindle.
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