How is that related? If someone puts CP intentionally into the block chain that has nothing to do with math. The spread of child pornography is a criminal offense and they could just force every miner to split the chain or charge them for spread of CP.
> By that logic you could make anything illegal, legal.
I'm not a lawyer but from a technical point of view it's almost impossible to remove any kind of data from a truly distributed network. Be it Bitcoin's Blockchain, BitTorrent or the internet itself. That's just a fact, no judge order will change it, sorry.
And as M4v3R said it'd be very expensive to add a big file like a picture to Blockchain anyway.