Well Digimarc has been a preinstalled Photoshop plugin for ages. Though the version in PS(E) only reads the watermark, though for watermarking you need to give out some cash. Evidently ( tested by RC Concepcion) it is possible to read the invisible watermark even after printing and rescanning.

It's in the paper. There is a brand called Deterx that does what you are after.

This stuff is not photo or inkjet paper, but it looks ok until you copy or scan those sheets...

Oh - and it isn't cheap either...

Google is your friend ... ;-)

We have that on official government documents in the UK, (old driving licence counterpart etc), but this worked by cleverly printing the words on the paper in a way that it was very hard to detect with the naked eye, but would be picked up easily by a photocopier or scanner. I've never seen it used in the way you want, and am supprised that you say it can be. I would think the government spent a small fortune in having it incorporated in documents, on a piece by piece basis.

Does anyone know what kind of software to use to make invisible watermarks on photos? Alot of what I've found is for visible watermarks.

Specifically what I am after, is something to make an invisible watermark "copyright", that can't be seen TILL copied/scanned. We went on a cruise and got pictures taken one time that were like this, you could not copy them, as an invisible watermark would show up "ruining" the picture /copy if you did. I am looking for something that would do this, so that I can give pictures to someone without risk of them copying them.

Thanks!