I know this is really old, but I wonder if it has really been decided completely in all jurisdictions if this is legally ok or not, because on the German Amazon

I know this is really old, but I wonder if it has really been decided completely in all jurisdictions if this is legally ok or not, because on the German Amazon website the button for ebooks is very clearly labelled with the German word for "buy", and it is merely labelled as a different format like hardcover or paperback. There might be legalese buried elsewhere (while creating the account or activating the Kindle or whatever), but according to their own words you buy a book in the Kindle format, you do not rent access to it. I buy Kindle books all the time, and would love to see this decided in court...