title_body: How to discover/work around a limited number of devices for Kindle ebooks?
upvoted_answer: As stated in Consumerist, as far as Amazon goes (the rules are usually similar [not identical] for B&amp;N):
  
  
    
    You can download a book an unlimited number of times.
    In most cases, you can download the book to 6 devices. If you need to download it to more devices than that, you can request that Amazon
    release additional licenses for the book. According to Dan’s [their contact] recap of
    the conversation, Amazon promises nothing. But you can ask and they’ll
    probably oblige.
    Then there are the “other” cases, where a publisher sets the number of simultaneous devices to a lower limit. The following is from an
    email Dan received from Amazon’s customer support: “Publishers choose
    whether they apply DRM to their content and thus determine how many
    copies of each title can be downloaded to different Kindle devices at
    the same time.”
    There’s no way to find out this limit prior to buying the book.
    Releasing new licenses requires that all of your current device licenses be removed, so you’ll have to start over and re-download them
    to all devices again.
    
  
  
  You should be able to remove a book from one device and download onto another after reaching your limit as long as both devices are connected to the internet, but there's no guarantee. There does not seem to be a way to see how many devices are left.