And the scraper can't change rel-author to his own authorship?
I haven't yet seen a single google "this is a good idea to prevent stolen content..." that helps against scraped/stolen content. All the ideas can so easily be circumvented in some way.
The only successful one as far as I can see would be via webmaster tools, but last time I looked there was nothing there to show that content tied to YOUR WMT verfication ID was contested when found with either no ID or someone else's verfified ID. Which should be easy to do, yes? I mean, if they really cared?
Basically: secure your site or lose it.