I too had hoped Amazon would follow Sony's lead and open their platform to secure pdf's with a software upgrade, but the removal of the * support for PIDs on their mobi servers makes me wonder if they are going the opposite direction.
While I played with dederm script, I have stuck with using Igor's because my goal has never been to remove DRM completely (a technicality I suppose, but it makes me feel like I am not totally breaking the rules

).
Thanks for the responses though, I do feel better though about my purchase