Originally Posted by wallcraft
Amazon is using the same MOBI format, but it only ever uses one PID per file. So each ebook file is locked to exactly one device
Really? So if you have two Kindles, you have to download the files twice - once for each Kindle - and the file for one Kindle won't work on the other? Doesn't that make it somewhat difficult to keep personal backups of your books on your PC, for example? How do you know which file is for which Kindle?