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Originally Posted by wallflower75
I'm a little confused. So in order to be able to strip DRM from a Kindle file right now, I'd have to download the file to either a Kindle or an iPhone/iPod touch in order to use the device's PID. Do I have that right?
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Actually you don't have to DL to the Kindle, you just have to DL the varient that was made for the Kindle. If you own a Kindle you can DL to your computer and transfer to your Kindle. This is different from DLing to your Kindle4PC which has it's own unique name.
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Originally Posted by zacheryjensen
I can assure you with absolute certainty as an owner of Kindle 2, Kindle for iPhone, and Kindle for PC, none of those three share the same PID. I have successfully ripped DRM from Kindle 2 and Kindle for iPhone using their respective PIDs. The same books from the Kindle for PC can not be decrypted with the PID from either Kindle 2 or Kindle for iPhone.
And yes, this had already been established (and, as a matter of logic, should not be surprising.)
The fact is, every entity registered into the Kindle system, the listing you can see when you go to the site to "Manage Kindle," represents a unique encryption target and, assuming they all use the same type of encryption (no special reason this would be required, even within the mobi basic file format,) they'll all have unique PIDs too.
The only thing close to an overlap is the direct download link from your "owned" books listing which is intended for manually loading books onto a Kindle/Kindle 2 and I would imagine that if you had multiple standard Kindles on your account that link would be duplicated for each one.
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Based on a single AZW book DLed to two different Kindle4PCs and run through a compare (by byte) there were 177 bytes that were different. I assume that the Kindle4PC's PID is embedded in there somewhere but I doubt that it is not encrypted in some manner.