Amazon has done a few things that make it a little more inconvenient to strip DRM. One of the first was to no longer show the device ID under "My Kindle Devices". IIRC, this happened soon after the the iPhone Kindle app was introduced. All you need is the device S/N and a script to get the device ID. Introducing the Topaz file format was also an attempt to stop/slow down DRM strippers. It took awhile before good DRM stripping tools were available. Amazon has also made changes to the firmware on the K2, K3 and KXG to make it more difficult for DRM strippers. Same with the K for PC program. So far it only works until someone develops a work around or a new tool.
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