I'm not recommending it, but this would be a passable copy protection scheme for the web if you combined it with a css animation where you were only showing som

I'm not recommending it, but this would be a passable copy protection scheme for the web if you combined it with a css animation where you were only showing some (half?) of the pixels at once and using the eye's natural ability to interpolate images from a rapid succession of images. Because it's written in js, you could download the jpg like a normal file and do it all client side, so there wouldn't be any penalty from the conversion. But still don't do it. A business probably has bigger problems if it needs to use copy protection.