My 13 year old got a MBP for his Christmas to replace his Hackintosh. It mainly gets used for GarageBand & ProTools as he's in a band. He has, however, taken to Torrenting apps that he hasn't bought - Logic Pro etc - which I've told him I'm not going to let him do because a) there's enough on his machine to do what he needs and b) we have a home network and I'm not having him introduce a virus or malware onto it. I've put on Parental Controls and specified the apps he can use, but as far as I can tell OS X only allows me to stop him running installed apps (i.e. ones in the Apps folder) - it doesn't seem to stop him running things directly from Downloads. Any ideas? Any terminal magic I can run to stop him running things from Downloads?