Interesting to see the doom recreation. The commentary in the subtitles is fascinating.

So is this the tool to use before the 26th?

https://www.theverge.com/news/612898/amazon-removing-kindle-book-download-transfer-usb

MPL is a weak copyleft license.

If they make changes to your files then they have to share their changes to those files with a reciprocal license.

It has no impact on the licencing of the rest of their project.