Based on the post at Google Webmasters, a Google profile seems to be needed for
rel=author to work.
But this post on our forum does not indicate that.
How do I implement
rel=me without any Google profile?
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rel=author is part of HTML5, so you don't have to link it to a Google profile. However Google are saying that if you link it to a Google profile then they may display your picture in search results. They are choosing to use their search engine product to promote their profile product.
This post is more reassuring:
The markup uses existing standards such as HTML5 (rel=”author”) and XFN (rel=”me”) to enable search engines and other web services to identify works by the same author across the web. If you're already doing structured data markup using microdata from schema.org, we'll interpret that authorship information as well.
Google does not use the
rel=author or publisher any longer for SEO.