If you're an avid e-book reader or someone who has an extensive library of Kindle content, now is the time to back up your books: Amazon is killing the option to save e-books to your computer.

Amazon has revised the text when purchasing a Kindle e-book on its online store. You do not own the book you bought but are licensing it. It used to say 'By clicking on above button, you agree to Amazon's Kindle Store Terms of Use.

Amazon is making some big changes to its Kindle books, and you only have a few days to prepare. Here's everything you need to know before it's too late.