Copied for posterity:

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It's now possible to do this 100% within Linux, without running any emulators or Windows software, even though Adobe don't care about Linux support.

Knock is no longer maintained, however apparently it was just a wrapper around libgourou which is still maintained.

Installing libgourou (on Arch Linux it can be found in the AUR) allows you to download the ACSM file to a PDF or ePub:

# Use your username and password from https://account.adobe.com # This registers your device so only needs to be done once. adept_activate -u user -p pass

# Download the ACSM file acsmdownloader -f myfile.acsm

The downloaded file requires a password to open it, but if you need to open it in a normal viewing application, you can also remove the password:

adept_remove file.pdf

This process allows Linux users to access the same materials as their Windows and Mac friends, even without support from Adobe.

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