Quote:
Originally Posted by Chang
Thank you for your answer charleski!
I'm interested in both kind of watermarks, visible and invisible. Adding metadata or some "meaningless code" e.g. empty div elements or comments in the XHTML I count as visible watermarks because those can be found quite easily and therefore deleted easily as well. I'm also looking for a simple but effective way to add invisible watermark. I guess this is a secret for many people and they don't want to share their solutions and algorithms which is understandable. I'll google more about adding watermark for jpeg images, thanks for the idea!
I don't like DRM and that's why I'm trying to find other solutions to fight against piracy. With invisible watermark I could at least find out "where's the leak".
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One very simple way to do an invisible watermark is to place a comment in the jpg image. This won't show and most people wouldn't even notice it. It can also be used to identify the source and indicate copyright. Irfanview is a program that can add a comment to an image. Of course it is not as obscure as modifying the image itself.
Dale