Basically it’s a book that got both Yaroslav Hunka and Chrystia Freeland under fire from communist mags like The Maple, Canada Files, and Canadian Dimension. It was also recommended by communist party member Alex Boykowich who said it documents important lost history that kept hidden from public by the settler government. This is the book:
I’m familiar with DeDRM from Calibre and practically used I love cabbage de DRM python scripts on ADE reader for Overdrive. But I admit I’m not familar with the new game.
It’s been some time since I’ve been active in this scene. But maybe you could also ask around on the mobileread forums/IRC servers