Blackberry has cut a deal with security officials in India, allowing them access to e-mail and data sent using BlackBerry’s network. But the Indian government isn’t done yet. It’s now applying pressure to some other high-tech players.

Indian officials say they’re exploring ways to track the contents of conversations on Google’s video chat service and on Skype.

This spat is just the latest international dispute over internet privacy.

We speak with Fred Cate, a law professor at Indiana University who specializes in privacy and security, to understand what – if anything – security services gain when they try to mine massive amounts of information in search of terrorists.