Originally Posted by SpiderMatt
Does anyone know how Amazon identifies the files on your Kindle? Is there something in the DRM that identifies it for Amazon? Or will they only pull DRMed files? It shouldn't be the metadata because someone could have a book listed at Atlas Shrugged by Ayn Rand and it might just be a document the reader made from online SparkNotes or something.
Mobipocket format books have a unique identifier embedded in them. It would be easy enough to search books for that identifier.