The general consensus (at least on this forum) seems to be that if your shows being recorded or if someone you know seeing you online are things you're not prepared to deal with, then it's best not to start camming in the first place as there's no way to safeguard against those things happening. You can block states from entering your room on MFC, but all it would take to get past that is a VPN. And like Osmia said, there's no way to prevent your shows from being capped and shared, short of never camming to begin with.