Code Review on a Team?

Dave: On open source projects, it's not like we just give open commit rights to everyone. So on a team, you know, why not have the same thing? I'm just assuming that they don't have code review already. What if it's so Balkanized that, um, you're editing like 10 people's files if you're just making a change? Because often you have to make a change in a bunch of different files for a future. And what if the problem is just, you're just like crossing so many borders that everyone is mad at you?