I think you'd need to do that in javascript. I did a quick google search for it and didn't find anything like that. But I think it's possible to disable copying selected text from an html page, so I suppose one way to do it would be to disable copying, then add a "copy" button next to each post that copies a preview with "read more" link to the clipboard.
In any case, this won't generally stop people from copying your content because it wouldn't be that hard to get around (you only need to disable javascript, for instance).
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