Questions[mobi](ubuntu)

I have started reading ebooks, and found store selling DRM-free ebooks, which are watermarked with my real name and email address. I copy these ebooks to my PocketBook Basic Lux 2.

In case, that I loose my reader, I don't want finder to be able to steal books. For following reasons:

• I don't support illegal way of acquiring work,
• I wouldn't like to have my name wandering around the world as part of stolen ebooks.

However, I want to keep my ebooks stored at home in DRM-free way. Just, have them protected in my ebook reader in case of stealing/loosing.

Is there a (preferably CLI) way to add DRM protection to my ebooks?

Formats: epub, pdf, mobi.

How do I set fBreader (already installed with sudo apt-get install fbreader) to be the default epub and mobi file reader in Xubuntu 18.04? When I double click a .mobi or .epub file, fbReader does not open, and instead I am asked what kind of a file it is.

How do I set FBReader as the default mobi ebook reader? is specific to non-Xubuntu flavors and does not work with Xubuntu. Unable to find another relevant suggestion relevant to Xubuntu.

I have .mobi book and want double click on it to open book with Calibre eReader. I tried to open choosing option Open with other application but there is not Calibre eReader. Of course everything is ok, when I first open Calibre and then choose book.

How to set file association for .mobi?