Hi. Just noticed this cool feature on nbcchicago.com. If a reader tries to copy and paste the text of the article, it inserts a "Source URL" into the clipboard text. This would be an awesome feature for WordPress. I'm not aware of a plugin that does this.
Example:
"This is the pasted text from their website... It goes like this..."
Source: sourceurl.com/article/link/
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thatwastaxing