Aaranged - 8:16 pm on Jun 6, 2011 (gmt 0)
Why didn't they just call it "Stealing your data Microformat"?
inbound, I fail to see the logic of this assertion. Either you're offering up structured data for consumption by the search engines or you're not. Preventing them from indexing (or "stealing") your data is as simple as not making it available, either by excluding a resource from indexing, or by simply not publishing the structured data in your code.
Furthermore, as microdata - like RDFa and microformats - use markup attributes, it's not meant to offer up any new data that a website isn't already displaying, but to structure the data that's already there. Structured markup referencing a shared vocabulary makes it easier than parsing unstructured code, but it doesn't mean that unstructured code isn't capable of being parsed. In both cases the data is available from the presentation layer.