DMCA doesn't apply in this case. Beyond the fact that you aren't violating any copyrights, there is the issue of expressed exception in the DMCA for application compatibility.
What exemption is that? I don't see it on the copyright.gov LoC list. Simply applying CFW to say, boot into Linux should be safe, but I'm not talking about that. I'm talking about implementing new loaders that circumvent Sony's DRM, there doesn't seem to be any exemption that covers that.
And in fact, unless they reimplement all the GameOS functions, wouldn't there in fact be a copyright violation?
It really is an issue of getting out from under any NDAs and contract language which has already been agreed to. If someone went through the effort to utilize these hacks to completely document all the interfaces, published it, and then some greenfield developers use it to write a game and utilize the publicly available keys to sign it, it is all above board. Now Sony could always sue and try to delay things, but they'll lose just like IBM did.
Ah, you're talking about some publisher releasing a game on the platform? I mostly agree, but I wonder just whether the legality of the keys would hold up under scrutiny. It doesn't matter in general, especially not to bootleggers, as the cat's out of the bag.
I was referring to the legality of the CFW itself. That while groups involved in software piracy will be able to do basically whatever they want, legitimate developers may be hampered by GameOS custom firmware variants being potentially illegal.