Quote:
Originally Posted by DNSB
From the samples I've seen, it can be as simple as having your email address or other identifier in multiple places in the file, having spaces/double spaces used to encode the information throughout the file, using steganography to hide information in the cover or other images, adding a file into the META-INF folder that contained encrypted user information or adding a line into the .opf file with the scrambled user information.
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Seems like it should be pretty easy to just have two people independently purchase an SDRM book (or even just one person with two accounts) and then diff the contents of the two EPUB directories to figure out where all the potential watermarks might be.