Didn't the MPAA/DeCSS case (that happened after this) just route around this whole precedent using the DMCA and still end up making that source code illegal to

Didn't the MPAA/DeCSS case (that happened after this) just route around this whole precedent using the DMCA and still end up making that source code illegal to distribute or use? I remember some of the expert testimony presenting versions of the source code as all kinds of speech (someone even wrote a song I think) to make the point that code should be protected, but in the end they still lost the overall case. It's one thing to classify code as speech, it's another thing to give it complete protection from censorship or criminalization in any scenario.