Sony has gone militant in the fight to keep people from doing what they want with their own PS3 consoles. Sony wants to prevent anyone from hacking their console or offering hacks for the devices and has taken to a legal assault on Geohot and other hackers that have offered ways to bypass the PS3 security for installing software that isn't approved.
Some though that if you applied a hack to your console to be able to install unapproved software and never accessed the PSN that Sony had no way to catch the user. Apparently, that is not correct. One user going by NeoGAF has noted that he port sniffed his console and that at start up the PS3 contacted the Sony servers.
Apparently, the contact gave enough details that Sony could tell just from the device being connected to the web that it had been hacked. This information could then reportedly be used to ban the console or to force software updates to plug the security hole. Sony has already said it will offered updates to plug the holes Geohot and others are using on the PS3 now for their hacks.