https://web.archive.org/web/20221116202055/http://github.com/BentonEdmondson/knock

Find a file

benton d5c4c63ba8 output of commands is visible		2021-07-27 12:18:14 -05:00
.gitignore	the script is working correctly, still need to add logins	2021-07-18 19:29:12 -05:00
demo.png	CLI output correction	2021-07-22 21:01:58 -05:00
flake.lock	changed libgourou binary names	2021-07-27 12:05:51 -05:00
flake.nix	checking that the returned file is an epub	2021-07-27 12:08:30 -05:00
knock	output of commands is visible	2021-07-27 12:18:14 -05:00
LICENSE	added GPLv3 license	2021-07-22 17:29:58 -05:00
README.md	added notice about not using ADE nor Wine	2021-07-23 11:28:52 -05:00

README.md

Knock

Convert ACSM files to DRM-free EPUB files using one command.

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

Setup and Installation

Create a free Adobe account here if you do not already have one.
Install the software.
- For NixOS, include this flake in your system flake.nix.
```
inputs.knock.url = github:BentonEdmondson/knock
outputs = { self, knock }: { /* knock.defaultPackage.x86_64-linux is the package */ }
```
- For non-NixOS, download the latest release. It is large because it includes all dependencies, allowing it to run on any system with an x86_64 Linux kernel. It was built using nix bundle.
Download the ACSM file from wherever you bought the book.
Run knock my-book.acsm. Enter your Adobe username and password if prompted.

Verified Book Sources

Knock has been verified to work on books provided by the following

eBooks.com, as long as the description says
To download and read this eBook on a PC or Mac:
- Adobe Digital Editions (This is a free app specially developed for eBooks. It's not the same as Adobe Reader, which you probably already have on your computer.)

The resulting EPUB file can be read with any EPUB reader.

Legality

It's Perfectly Legal to Tell People How to Remove DRM (Gizmodo)

Do not use this software for piracy; this software is not intended for piracy. This software exists to allow readers to legally purchase and then legally and freely read ebooks. I suspect that the significant prevalence of ebook piracy is caused in large part by the restrictions put on legally purchased ebooks. This software exists to incentivize the legal purchase of ebooks by enabling their unrestricted and legal consumption.

The Name

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.

Dependencies

libgourou-utils for using the ACSM file to download the corresponding encrypted EPUB file from Adobe's servers
inept-epub for decrypting the EPUB file

These are already included in all releases and in the Nix flake of course.

License

This software is licensed under GPLv3 because one of its dependencies is licensed under GPLv3.