From the article you linked: "This case made clear that manufacturing and distribution of circumvention tools was illegal, but use of those tools for non-infrin

From the article you linked: "This case made clear that manufacturing and distribution of circumvention tools was illegal, but use of those tools for non-infringing purposes, including fair use purposes, was not." So it is legal to rip a DVD, it is illegal to make or distribute a tool that allows DVD ripping. Yes, the law is insane like that.