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FYI,
I have no idea if any of this is currently being used but you can easily find scripts on the net that can encode data to bit patterns in graphical images (jpgs, pngs, etc) that can't be easily detected without the correct software (i.e you could easily encode owner name/owner data into the cover.png and no one would know it was there), as well as create/change comment sections inside most graphical image files that can be used to store data as well. Then of course, it would only take one unique string of data or a known pattern of bytes (any sequence of typos, mistakes, spelling variations, spacing, etc.) to uniquely identify a file. That combined with a database of unique byte sequences and original owner would be enough to identify the source.
My 2 cents ...
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