Knock: Convert ACSM files to PDF/EPUBs with one command on Linux

Calibre has supported this for some time now. Calibre is also available on Linux.

What is an ASCM file? In forty plus years I've not encountered this extension.

It's a "voucher" for an epub/pdf protected by Adobe DRM.

After purchasing a book "you" get an ASCM file and use it to

a) download an encrypted file from a content server

and b) get the encryption keys protected via a PKS system.

This was cracked a few years ago and apparently Adobe/vendors never upgraded.

Wow, that sounds even worse than I imagined.

I was provided a ascm file when purchasing a ebook at Google Play.

I was able to get a refund when it turned out that there is no offici way to convert it on a Linux system.

Thanks! I needed this. My library has either ACSM or send to Kindle. So I cannot read it on my old Sony eBook reader. Until this.