Micro formats to block HTML text portions of pages

[Merkle-Impaqt]

I have a client that wants to use micro formatting to keep a portion of their page (the disclaimer) from being read by the search engines. They want to do this because it will help with their keyword density on the rest of the page and block the “bad keywords” that come from their legally required disclaimer. We have suggested alternate methods to resolve this problem, but they do not want to implement those, they just want a POV from us explaining how this micro formatting process will work. And that’s where the problem is.

I’ve never heard of this use case and can’t seem to find anyone who has. I'm posting the question to the Moz Community to see if anyone knows how microformats can keep copy from being crawled by the bots. Please include any links to sites that you know that are using micro formatting in this way. Have you implemented it and seen results? Do you know of a website that is using it now? We're looking for use cases please!