UPDATE 3/5/2016: Amazon has changed its mind, decided to return the option for full-disk encryption to the Fire (in a couple of weeks). Amazon says the about-face was not related to the outcry on social media.
http://mashable.com/2016/03/05/amazon-encryption
ORIGINAL POST: In total secrecy, Amazon has removed the ability of its Fire tablets to encrypt their stored data.
That means that, if you lose your Amazon Fire while traveling, all your data on it will be available to whomever finds it.
http://www.theguardian.com/technology/2016/mar/03/amazon-fire-encryption-user-data
This is a very curious move on Amazon’s part, and they are not explaining why they have made the change.