Convert ACSM files to PDF/EPUBs with one command on Linux (and MacOS very soon).

This software does not utilize Adobe Digital Editions nor Wine. It is completely free and open-source software written natively for Linux.

1. Run uname -ms and, based on the output, download the latest corresponding release.
2. cd into the directory that knock is in (e.g. cd ~/Downloads).
3. Run mv knock-version-arch-os knock to rename the binary to knock.
4. Run chmod +x knock to make it executable.
5. Run ./knock ./path/to/book.acsm to perform the conversion.
6. Run mv knock ~/.local/bin to allow it to be run from anywhere (might not work on some distributions).

If you are on a system with Nix, you can use the following.

nix profile install github:BentonEdmondson/knock

If you are on NixOS, you can add the flake to your system config.

There are no userspace runtime dependencies.

Knock should work on any ACSM file, but it has been specifically verified to work on ACSM files purchased eBooks.com and Kobo, among others.

Before buying your ebook, check if it is available for free on Project Gutenberg.

Every book can only be downloaded once and then remains locked. Treat the generated epub/pdf files carefully.

Install Nix if you don't have it. Enable flakes if you haven't.

nix build

nix flake update

nix run .#tests -- ./tests/workspace

Test books can be found here.

nix run .#formatter

The name comes from the D&D 5e spell for freeing locked items:

Knock

2nd level transmutation
Casting Time: 1 action
Range: 60 feet
Components: V
Duration: Instantaneous
Classes: Bard, Sorcerer, Wizard
Choose an object that you can see within range. The object can be a door, a box, a chest, a set of manacles, a padlock, or another object that contains a mundane or magical means that prevents access. A target that is held shut by a mundane lock or that is stuck or barred becomes unlocked, unstuck, or unbarred. If the object has multiple locks, only one of them is unlocked. If you choose a target that is held shut with arcane lock, that spell is suppressed for 10 minutes, during which time the target can be opened and shut normally. When you cast the spell, a loud knock, audible from as far away as 300 feet, emanates from the target object.

This software is licensed under GPLv3. The linked libraries have various licenses.