Malware in the Kindle SwindleOther examples of proprietary malware
Malware and nonfree software are two different issues. Malware means the program is designed to mistreat or harm users when it runs. The difference between free software and nonfree software is in whether the users have control of the program or vice versa. It's not directly a question of what the program does when it runs. However, in practice nonfree software is often malware, because the developer's awareness that the users would be powerless to fix any malicious functionalities tempts the developer to impose some.
The Amazon Kindle has a back door that has been used to remotely erase books.
The Kindle also has a universal back door.
The Amazon Kindle has DRM. That article is flawed in that it fails to treat DRM as an ethical question; it takes for granted that whatever Amazon might do to its users is legitimate. It refers to DRM as digital “rights” management, which is the spin term used to promote DRM. Nonetheless it serves as a reference for the facts.
The Electronic Frontier Foundation has examined and found various kinds of surveillance in the Swindle and other e-readers.