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I was just asking about this yesterday: https://news.ycombinator.com/item?id=9309120

I would love to know how to manipulate images/documents to make it so that photoshop won't open them and photocopiers won't copy them...

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Just pop the EURion constellation in them somewhere (ideally a number of variations of it). http://en.wikipedia.org/wiki/EURion_constellation

Would be funny to include http://en.wikipedia.org/wiki/EURion_constellation on websites, so you cannot make screenshots with Photoshop ;)

From the first paragraph of your link: "Research shows that the EURion constellation is used for color photocopiers and is likely not used for computer software."

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