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Originally Posted by Elfwreck
Watermarked epubs should be interesting. How'll they do that, put a code inside the metadata? Which could only be removed by someone who knows how to unzip files & edit html?
Watermarks are likely to be not-very-useful if they're not visible to the end user. Well. Not useful in the "prevent unauthorized copies" sense. If there's no visible watermark, someone will blithely upload the files to torrents & filesharing sites, and Rowling will be within her rights to track down & sue that person--but the files will already be spreading.
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It is insanely easy to hide data in ways that it isn't visible. Think of it as meta-metadata. Metadata, as you normally think of it, is data that doesn't display visually but is still in an area of the file that you can easily parse through. Now, say if the file's information (and traditional metadata) says the the end of file is at a specific spot, there's nothing that restricts you from putting info in past that spot. Certain image files are really bad about doing that. You can have an image that opens up and appears perfectly normal, but it has extra stuff shoehorned in to where your image editors cannot see or touch it.