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Shifting pixel colour values at set points somewhere defined
by webmaster would be harder to circumvent.
Appending is not such a good idea as 80% of us use some kind
of copy bug on the edge of an image. When content theives
do their thing, they usually crop these off.
I wouldn't be too concerned about the CPU hit, enough sites
use the GD library very effectively in high traffic enviornments.
Sextracker comes immediately to mind.
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This AVS pays my mortgage!
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