Just got myself acouple of books from The Black Library. Including The First Heretic.
Amidst the galaxy-wide war of the Great Crusade, the Emperor castigates the Word Bearers for their worship. Distraught at this judgement, Lorgar and his Legion seek another path while devastating world after world, venting their fury and fervour on the battlefield. Their search for a new purpose leads them to the edge of the material universe, where they meet ancient forces far more powerful than they could have imagined. Having set out to illuminate the Imperium, the corruption of Chaos takes hold and their path to damnation begins. Unbeknownst to the Word Bearers, their quest for truth contains the very roots of heresy…
You can download a sample chapter. Turns out the ebooks come with no drm. Which is refreshing in this day and age. Or at least nothing obvious. The Calibre ebook viewer was able to open both the epub and the mobi files without issue.There may well be some kind of social drm embedded in the files. but I suspect not.
So there you go.