From nyt:

Some hackers say Sony wants to deter customers from modifying the PlayStation3. Is that true? No, there’s a real misnomer there, we embrace independent game development; if you call that hacking, then we embrace that. We give people tools that let them create new experiences. What I don’t think we are in support of is someone trying to hack our device to pirate software and possibly collapse the platform.

No, you fucking don’t. Instead, you call them pirates and sue them:

MS. SACKS: Well, certainly one thing we might find is whether or not any of them are engaged in the hacking that we now know was a widespread effort. Obviously, the people in this class are the people who downloaded, or claim they downloaded the Linux operating system onto their other OS. It is beyond dispute now that there in is an ongoing effort to hack the PS3. In fact, most recently, there was an effort to hack around for update 3.21. And these people, as members of the class, are engaged in activity that is not only prohibited under Sony's agreements, but is illegal. So if, in fact, some of these very sophisticated users, who are included in the five named plaintiffs, are engaged in the hacking, we certainly have the opportunity to find that out.