PL/SQL Guy writes "The Kindle has a number of 'remote kill' flags built in to the hardware that, among other things, allow the text-to-speech function to be disabled at any time on a book-by-book basis. 'Beginning yesterday, Random House Publishers began to disable text-to-speech remotely. The TTS function has apparently been remotely disabled in over 40 works so far.' But what no one at Amazon will discuss is what other flags are lurking in the Kindle format: is there a 'read only once' flag? A 'no turning the pages backwards' flag?"