Quote:
Originally Posted by sirbruce
The PID is not "part" of the DRM scheme. It's a public identification number used as a reference key. The fact that it's somewhat obscured on the Kindle is irrelevant. Most people don't know the VIN number on their automobile or their MAC address, either, yet those are both numbers used for security and authentication purposes.
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The PID is part of the DRM. it's what's used to be the key that fits the lock. The PID is used as the key for encoding the DRM.