I’m looking to change my reading and buying habits away from Amazon and need an alternate source for my ebooks. Where can I buy ebooks that won’t expire or have their licence revoked and will allow me to download a copy of that ebook I can store on my own system regardless of the websites status?
A lot of (bigger) bookstores also sell ebooks on their websites. There it usually depends on the publisher if they have DRM or not, so just look around.