i have a question regarding the Reader Hub apps in Note.

The Reader Hub powered by Kobo. i'm intended to buy some books thru it. but my concerns, after i buy it, is the book will only be available in the Reader Hub apps only? can i store it somewhere else? for example, can i transfer the purchased book into my laptop? or, if later i changed device to other which don't have Reader Hub/Kobo, will i be able to retrieve my books?

anyone can advice?