You can't use DRM-ed ePub (or non-Amazon-DRM-ed Mobi, which the libraries sometimes use) on the Kindle without stripping the DRM, which we are not to discuss on MR for the forum's own protection, due to its being considered illegal in certain areas.
You can, however, use DRM-free Mobi which several sites have, and convert any other DRM-free format to Mobi and read them with perfect ease on your Kindle.
Hope this helps.
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