Well, while the phone is under warranty you're still under an agreement with AT&T, so you really can't legally jailbreak anyway since you signed an agreement.
The point is that after you have paid Apple, and ended your contract with AT&T, your phone is yours to use as you please. You are not breaking copyright law by modding it and repurposing what is otherwise nothing more than an iPod Touch. Hopefully what this ruling does is ensure that there are years of life left in devices that are abandoned by Apple and the iOS yet embraced by the modding community. If the modding community can make my old iPhone more useful then damn right they should be allowed to do it without fear of legal retribution. I'm excited to see what they can do with it now that they can openly collaborate.
The point is that after you have paid Apple, and ended your contract with AT&T, your phone is yours to use as you please. You are not breaking copyright law by modding it and repurposing what is otherwise nothing more than an iPod Touch. Hopefully what this ruling does is ensure that there are years of life left in devices that are abandoned by Apple and the iOS yet embraced by the modding community. If the modding community can make my old iPhone more useful then damn right they should be allowed to do it without fear of legal retribution. I'm excited to see what they can do with it now that they can openly collaborate.