"Say I tell you that you have my permission to move a book I wrote (and am thus the copyright holder for) from your Kindle to another device. If the Kindle book has DRM, you're still not allowed to move it. The fact that I am the copyright holder has no impact on whether Amazon—a company that didn't create or invest in my book—can prevent you from moving that book outside of its walled garden...In fact, if I supply you with a tool to remove DRM (like some versions of Calibre), then I commit a felony and Amazon can have me sent to prison for five years for giving you a tool to move my book from the Kindle app to a rival app like Kobo," [Cory Doctorow] wrote.