Copyright is applied to books. The books you have on your Kindle are subject to exactly the same issues. https://www.npr.org/templates/story/story.php?storyId=1

Copyright is applied to books. The books you have on your Kindle are subject to exactly the same issues. https://www.npr.org/templates/story/story.php?storyId=106989048 https://www.npr.org/templates/story/story.php?storyId=106989... For physical books, you have first-sale doctrine rights. For digital books, your license agreement means you usually agree those rights don't apply. That's why storing and sharing physical books is not a crime - you have actually purchased them.