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author here: I do not advocate using any of the techniques, please don't use it, it's terrible and will give your users headaches! I'm against ressource "protection" on the web, what's on the internet should be fully consumed by users of it! The article describes just a few experiments I set up to see how far someone could go if it WAS important ( "for a few minutes, let's assume things on the web should be protected…" ). Thanks for the feedback so far!

Your final demo is easily defeated because a link to cat.png appears right in the page source:

I mean this line:

<img id="cat" src="cat.png" width="237" height="235" />

in the source code to this page:

Am I correct in assuming that for demo purposes you didn't worry about that, but if you had intended to do this in practice, you would have to feed the data in cat.png to client in some non-obvious way?

Yes you are right, the main purpose of the last demo is to try to prevent a screen shot (ignoring all other techniques to obtain the image). thank you I, already forgot about it and will change that

Thank you for this article - I think the best way to protect our artwork (in any medium) is to sensibilize our users.

Give credit to the artist, that's all we want in the end.

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