I had a friend who had this happen to her -- some SEO spammer picked up the complete text of her blog and posted it under a bunch of different domains, full of hidden links.
It was reasonably easy to deal with, though; all you need to do is figure out where the sites are hosted, and then submit a DMCA complaint to the host's abuse address indicating they're hosting illegally copied copyrighted material. Legitimate hosts will take stuff like that down pretty quick.
There's two things the DMCA requires that they'll look for in your complaint before they'll take action, though, so make sure you include them:
1) The statement "I swear under penalty of perjury" that you hold the copyright for the material, or that you are representing the person who does; and
2) A list of filenames that contain the infringing content.
(If the host won't take action, you can file the complaint at whichever registrar the domain was registered through, too.)
It was reasonably easy to deal with, though; all you need to do is figure out where the sites are hosted, and then submit a DMCA complaint to the host's abuse address indicating they're hosting illegally copied copyrighted material. Legitimate hosts will take stuff like that down pretty quick.
There's two things the DMCA requires that they'll look for in your complaint before they'll take action, though, so make sure you include them:
1) The statement "I swear under penalty of perjury" that you hold the copyright for the material, or that you are representing the person who does; and
2) A list of filenames that contain the infringing content.
(If the host won't take action, you can file the complaint at whichever registrar the domain was registered through, too.)