Quote:
Originally Posted by Stitchawl
This is why most photographers today are embedding their names into the photos in almost invisible locations (inside shadows, patterns, etc. and almost transparent) besides having a visible copyright name and mark. Someone can easily remove the visible stuff and the metadata, but unless they know where to look, they will never find the hidden markings. Thank goodness they aren't doing this with books as well!
Stitchawl
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Actually they are. It's called digital watermarking. Pottermore is one that is using them.