The nodes that host the files can have the files blocks wiped from their store, rendering the hash known but unviewable until the content is reentered into the ipfs network,

It's also possible to track down which nodes have a copy of the file and attempt contact the owners for removal.

Finally IPFS does have DMCA precautions however they seem to have never been used and due to FOSS, can be easily bypassed (not that I advocate this in anyway, just talking factually.)