You are somewhat lacking in legal knowledge. This ruling does not allow the copying of any copyrighted material, current copyright law still applies. You can not copy a DVD you do not own even if it is for your own use.
What this ruling means is if a US citizen buys a work that has been published overseas the same “first use” policy pertains to that foreign published work as it does to a domestic published work. The publisher does not have a right to prohibit the resale of that work.
No they didn’t, and no they can’t.
Read the opinion.
So what you’re saying is that if I exercise my right to “personal use”, which constitutes a legally-made (but unpaid for) copy, under this ruling I would then be able to sell that personal use copy down the road, without having to ask permission or pay royalties to the copyright holder?
Interesting point, but I’m not sure that’s what this ruling does ...