Jeremy Keith had a strange run in with a DCMA complaint on a discussion site he runs, in the thread titled Perfect Pitch. It’s certainly odd, because there was no material from the site that was referenced. What’s more, the complaint was filed with Google, so that the thread was dropped from the search index. It might make sense, however, if the owner of that site filed the complaint because it would remove the page from the rankings, as a sort of super-black-hat SEO.
For legal reasons, we’ve excluded from our search results content located at or under the following URL/directory:
This content has been removed from all Google search results.
Cause: Somone has filed a DMCA complaint against your site.
Jeremy talks about it in his journal, on a post called (obviously) Perfect Pitch.