German owners of Sony Reader T1, T2, or older models can now buy ebooks from Sony rather than the plethora of ebookstores competing in the German ebook market (Thalia, txtr, to name a couple).
Rude comments aside, there might actually be a reason to buy from Sony. The press release mentions that not all of the Epub ebooks sold by Sony come with the onerous Adobe DE DRM. Some of the ebooks, numbering in the "thousands", use digital watermarks instead.
Apparently several German publishers have decided to go with this low-hassle security, including Bastei Luebbe Verlag, which publishes novels by Ken Follett, Andreas Eschbach, and Dan Brown (it is not clear that any of these authors' novels are DRM free).
Digital watermarks work by burying traceable information inside an ebook, info which can be used to identify the original purchaser. Because this is often times little more than a few extra lines of text hidden in the file, it is a minimal nuisance for the legitimate purchaser while still being as equally effective at preventing piracy as the more painful forms of DRM.
According to Huub van der Pol, the founder of Booxtream's parent company iContact, the official release of the Harry Potter ebooks saw a decrease in piracy of the series. Once the titles were available legally, and were easy to use, pirates saw little reason to post copies of the ebooks online.
You cannot make that claim about any other ebook, whether digital or paper, except for the ones which are DRM-free.