Calibre does not use MobiPocket code to generate MOBIs. It also does not add or subtract DRM.
If you prefer Calibre's ePub to MOBI capability, then one work around might be to use mobi2oeb to explode the Calibre MOBI. Then remove the toc.ncx (since you don't want a TOC, note that you will also need to edit the .opf file to remove references to toc.ncx). Then use MobiPocket Creator or mobigen on the .opf file to make your final MOBI. I have not tried this, but the intent is to maintain the superior ePub to MOBI capability of Calibre but still get a DRMed MOBI. Otherwise, you could just give the ePub to mobigen directly.
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