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Some additional information. Based on other hints in the reading I've done (I think I'm up to page 20 now), I extracted the backup.ab file, and found the map_data_storage.db file, and attempted to add that key to DeDRM. It complained, saying it was the same as the previously stored key. So it looks like I did get the key added successfully - but it still won't remove the DRM.
Pointers welcome...
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