Doctrow is a socialist idiot. Unless you can save the files yourself and read with a non-approved reader then you have no guarantee at all.
Same with the old divx dvd discs they tried to push for awhile.
Caveat Emptor.
Wow I just remembered there’s a bunch of audio books i have on amazon that i never read.
i wouldn’t mind the refund :)
There are converters to convert a ebook to a pdf file.
I have one that takes Amazon Kindle ebooks to different formats so it is portable. I can view on my phone or computer or tablet and not just a Kindle.
If folks bothered to read the boilerplate that comes with anything ebook related, they’d already know this.