So I caved and bought some books from Kyobo that were definitely not on thé usual channels and they have them in such a way that you can only read them from the app. So I downloaded them to my phone using the mobile app (the app doesn’t support Linux and is basically a Rootkit anyway) and copied the files from Android/data. They’re OEBPS by structure but come in regular folders, is it feasible to just zip them and import to Calibre?
Edit: I found a Calibre plugin for the DRM itself, so it’s more “How to make this folder a file”
Edit: so you can just zip them up and import as epub BUT the DRM plugin only goes as far as the metadata, the content itself shows up garbled. Don’t know how to get around that one…
Here you go! https://play.google.com/store/apps/details?id=com.kyobo.ebook.common.b2c
Give the name of a free book. Also what an awful app, it is an abomination. Is there a way to change the language to English, don’t know Korean?
I know, I hate the app too - precisely why I was trying to get this book onto my ereader
https://ebook-product.kyobobook.co.kr/dig/epd/ebook/E000013374986 here’s one where the first volume’s free for the next 5 days - no English storefront UI unfortunately, you might have to use a translator for the website
I looked at the code using jadx, it can decompiler apks easily. I found out that the licence is obtained from the server, you will have to do the rest of the work yourself.
Look for Public Class LicenceManager and drmkey, you should be able to find the dycrption algorithm.
The url for the license is ddrm.kyobobook.co.kr/drmone/mobile/gateway/license.do
https://github.com/skylot/jadx
This is my guess I believe each book has a different key and to get access you need the license. Since I didn’t purchase the book I can’t get access to the decryption key. I hope I am wrong because this is annoying drm.
I looked up the url in a search engine and found this it might help, I believe this is a guy to locate the decrypted files on a pc: https://bibliothecamysticadedantalian.tistory.com/m/45
Also an old study on how to break DRM on Kyobo: https://seclab.skku.edu/wp-content/uploads/2018/04/NTMS_conference.pdf
If you ever manage to break it I will appreciate if you tell me how you did it. I believe extracting the decrypted book from a pc is the easiest method.
Thank you I used google lens to navigate, but does it require phone permissions.
Comfirmed that it is protected by fasoo
DRMONE This Document is encrypted and protected by Fasoo DRM