Remove Adobe DRM from Epub book

2026-04-03

This is requires docker on your machine.

Basically, do this:

➜ docker run -it -v $(pwd):/home/knock -v \
~/.config/knock:/root/.config/knock \
--rm jeffrice/docker-knock ebook.acsm

To explain it a bit further:

• ebook.ascm is the file you get when you buy an epub that has adobe drm in it. The name will vary.
• jeffrice/docker-knock is the magical image that does the magic - thanks jeffrice!
• I think "knock" is part of the magic? I forgot to take notes when I did it last. Sorry.

If done correctly, a drm free epub will turn up in the same folder as the acsm-file.

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