The problem is that an invisible watermark only works if someone is being very careless and not doing anything to find and circumvent such measures. I can think of several easy ways to remove the watermark, none of them very technical even: 1. If the image is high-resolution, print it and scan it back. No more invisible watermark. 2. Display and take a screenshot. Even for an image with resolution larger than the screen, several screenshots can easily be reconstructed in PS or PSP. 3. Convert in some application to another format that drops the watermark data. This is the problem with encryption, licensing, watermarking, passwording, and so on. Hackers/crackers/thieves don't think conventionally about getting what they want. Applications use frequent checks to verify licensing. The crackers just jump over the checks themselves and continue on their merry way. I think it will definitely come down to personal verification techniques such as retinal and fingerprint scans. Even then, the correlating data that verifies that 'you are you' will need to be stored offline and in Fort Knox to avoid identity theft.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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