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I would like to add (not remove) DRM to an EPUB file? How would I do it? Preferably on OS X.

I tried Gooogling but (all) of them are about removing DRM from EPUB.

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What are you trying to do with this DRM? Is this to secure a document for internal use, for paid distribution, or for some other purpose? See "What is the XY problem?" for more details. – bwDraco Aug 16 '13 at 1:56

You'll need proprietary software made for adding DRM to ePUB's.

Check out Adobe's Content Server product line, as it implements a version of Adobe's DRM "ADEPT" (Adobe Digital Experience Protection Technology).

Adobe® Content Server 4 software is a robust server solution that digitally protects PDF and reflowable EPUB eBooks for Adobe Digital Editions software and supported mobile devices, including the E Ink, smartphones, and tablet devices.

More info from Wikipedia.

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