I guess. PC games did things like user keys because of piracy, NOT because they wanted to extract additional money from the people keeping them in business--anything on your computer can be cracked and ripped, so PC files in particular are vulnerable to counterfit WAY more than any other medium. You can pirate old lady Doris' frog figure from Sears using molds, but it's more effort than it is worth, whereas PC files (via CDROM, etc.) can easily be transferred and distributed via the internet even if the user is an idiot like me (PC keys didn't really exist before the internet). Game companies locking out used games are just artificially manipulating the free market in order to hold their monopoly on the most lucrative entertainment medium to ever exist. But I will say this: even if they were to try to implement such a feature, it would fail. They can have the possibility of such "lock out" features because of the technology inherantly tied to games, but that same inherant technology is what allows people to hack the code and de-activate it. PC software has security keys, but how many people have paid for, oh I don't know, Photoshop? Unless you run a business, I am guessing you have probbaly just stolen the software. I certainly have never known anyone who paid for an Adobe product that wasn't either using it in a professional context or using it in a business context. All that will happen if Sony or MS implement such a feature is people hacking the code, just like when they pathetically tried to implement a security feature for BD only to find people cracking it almost overnight.