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Consult an attorney to get up-to-speed on copyright, infringement, and fair-use.  Filing DMCAs or taking other actions that exceed your rights or infringe on the fair-use of others can result in a lawsuit against  YOU. Infringement by an upstanding company is usually done by an employee, a content writer, or an SEO who is ignorant about copyright law.   Rarely they can be guilty of willful infringement, which can result in both civil and criminal actions. If upstanding people or organizations are infringing, you can send informal infringement complaints yourself or have them sent by an attorney.  It is often better to notify them of the infringement and get it stopped before it increases. The quickest way to deal with spammy infringers is the DMCA to Google that SEAN suggests.   You can also send DMCA to their host.  If they are monitized by adsense you can complain to Adsense and they might turn off the ads on infringing pages or turn off the ads to the entire site. I am not an attorney, but have used them frequently.  They usually cost less than you fear and are usually worth more than you pay them.

Hey Bill, Dave here from the Help Team! If you are finding these in Site Crawl, you can also find the referral link, which is where we found these 404 links.  Using that referral link might help you track down where in the source code these links are being found if you wanted to remove them.  Hopefully that helps to clarify!