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Old 01-15-2008, 04:42 AM   #4
mbagsh55
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mbagsh55 doesn't littermbagsh55 doesn't litter
 
Posts: 46
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Join Date: Nov 2007
Location: Kanagawa, Japan
Device: Sony PRS-700/Zaurus SL-3100
Quote:
Originally Posted by JSWolf View Post
I think what happens is that when you deauthorize the reader, something inside the reader is changed so it won't work with DRm eBooks. And when you authroize it then it allows those same eBooks to be read.
I don't have any insider knowledge on the way this works, but assuming it uses encryption keys, a fairly logical way would be to encode the decryption key as a file based on the device's electronic serial number. This would prevent the key being readable, prevent copying of the key to another device (since the electronic serial number would be different) and would not be affected by the location (card or internal memory) of the book file.

Just an educated guess based on how similar schemes work however.

Regards,
Marcus
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