I said, "I'll leave it to you to find out why". This is a public forum. Just maybe look up some Calibre plug-ins which might help you "manage" DRM books.
I've used it and I found it the worst form of DRM. It required creating an "account" with Adobe despite having no relationship with them (It was to access books at my local library where I already had an account) and the software didn't even work on linux. Even getting it to work at all took ages of tinkering and I'm an IT expert. My parents who just wanted to simply check out a book out of the digital library during the pandemic would never have managed to figure that out.
And yes I have liberated all my DRM books from Amazon. But Adobe Digital I will never touch again (Nor buy books with DRM on it in the first place).
Really that is WAY too complicated for my folks. And for me I don't want accounts with big tech companies to do something local so step 2 was already a blocking point.
And as for removing the DRM (I assume that's what you're hinting at), yeah but that can be done with kindle's and kobo's too and in less roundabout ways. The existence of a hack for Adobe DRM doesn't make that a 'good' DRM.
