we had used some images from an mfg's pdf installation manual on a page that was reselling that mfg's own products which we were buying from their offical distributor - the only way to get the product. talk about absurd.
some of the media that they claimed was theirs was in fact our own original graphics/images. it didn't matter, we had to remove everything that was in their overly broad claim.
the DMCA is no joke, but is also a big fucking joke. it's trivial to completely destroy someone's business by simply making fraudulent claims (it's guilty until proven innocent). and it's almost impossible to prove that the claim was made in bad faith rather than simply in error. these claims are usually made by some contracted third party that flags everything that smells off. it's the new patent trolling.