Calibre can't bundle DRM-removal, because writing and hosting DRM-removal software is a "go to jail" crime in the US. In a Catch-22, it isn't necessarily illegal for individuals to use such software if it is for personal use.
There are now stand-alone, and very easy to use, software tools to strip B&N and Adobe and Kindle (K4PC) DRM. Once an ebook is DRM-free, Calibre can format shift and/or edit metadata and/or fix typos in the ebook. A good place to read about the state of play in DRM issues is Apprentice Alf's Blog.
In the case of K4PC, the simplest DRM-removal tool is a plug in to Calibre. This makes it almost transparent to buy AZW's from Amazon and format shift them via Calibre for an ePub device. This is a work around for the DRM-stripping laws, because the plug in is written by a 3rd party and isn't provided with Calibre.
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