After you bought your ebook, you are able to download it. After that you can encrypt you .aax with .rtc files from RainbowCrack.

git clone https://github.com/inAudible-NG/tables.git

$ ffprobe test.aax  # extract SHA1 checksum

Put in the scraped checkusm into the following prompt to extract the “activation_bytes”

$ cd tables && ./rcrack . -h 999a6ab8...