There, I said it. I'm betting most consumers and quite a few publishers don't realize that Amazon has limits in place to prevent you from loading one Kindle ebook on more than 6 devices within the same account. You're probably wondering why I have so many devices connected to the same account. The answer is simple: I like to test new devices and the old ones become hand-me-down's to family members. They all remain on the same account though.
Amazon has a default maximum of 6 devices for any given Kindle ebook. Once you try to get it onto the 7th device you're greeted with an error message saying, "License Limit Reached", and they nudge you to buy another copy of the product. No way. I already bought it once and I'm not buying it again.
This is yet another example of why DRM sucks. Someone decided 6 was a magical number and so no title can be read across more than 6 devices. Sure, I could de-register or maybe even just delete the book from one or two of my older devices but why should I have to?!
Limitations like this, including DRM in general, are evil and should be done away with. Amazon and publishers, please start trusting your customers and eliminate stupid barriers like this. You're not protecting your revenue stream this way but you're doing a terrific job of irritating your customers and reminding them that you don't trust them.