Some points of information
Everyone "puts a postit note" on their copyrighted works. The Register too. It is called the copyright notice, and if it's not there, then if someone copies it, you can't complain. All this use of RDFa does it makes the copyright machine readable too. Nothing wrong with that, right?
RDFa is just microformats generalised. It allows you to add machine readable information about the content. It's early days yet, but if a page for a conference for instance were marked up with RDFa, the browser would know it was an event, and could offer to add it to your calendar, show you it on a map, look for hotels, or flights. You can only do this if the information on the page is machine readable.
There really is an official W3C version of HTML with RDFa: it's called XHTML+RDFa. It's section 8 of http://www.w3.org/TR/rdfa-syntax/
There is already some adoption of RDFa apart from CC. For instance, it will be in the next version of Drupal (http://groups.drupal.org/node/16597), and check out the London Gazette (http://www.london-gazette.co.uk/) whose articles are chocka with RDFa.