An anti-gay activist was just fined $25,084 for filing a DMCA takedown request on content he didn’t ownâ¦
http://www.webmasterworld.com/content_copywriting/4741774.htm
http://www.dailydot.com/politics/straight-pride-uk-dmca-claim-sued-wordpress/
So make sure you own the content before you file the request.
And a big kudos to Automatic (the company behind Wordpress.com, Akismet, etc.) for doing the legwork to establish the precedent.