Quote:
Originally Posted by Pablo
The only way to know if any account information is embedded in a book is to buy two copies of the same book, at the same time, using two different accounts, DeDRMing both and making a binary comparison of the resulting files.
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(Also, make sure you use the same software to remove the DRM - binary comparison is as strict as it gets.)
Also, just because the files are different after DRM removal doesn't clearly mean there is account-identifying information in the file. There could be some additional information, but not enough to identify the account - though it's a clear sign that something is in there.