Quote:
Originally Posted by Fiat_Lux
There is a German DRM system that has random changes in the words of the book. No two officially distributed copies of the eBook contain the same words in the same order. Keep a list of who bought each version, and you can tell who whose copy is on TPB.
One of the US DRM systems scatters the purchaser's name, address, credit card number, and expiration date around the document.
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Or a Dutch based one that adds extra spaces between sentences. I assume there is some encoding in the pattern of 1 space/2 spaces between sentences that identifies the original purchaser.