Even now, streamed stuff isn't safe, at least not on Youtube (and, consequently, not on Twitch anymore). I saw a comment on one of the previous articles where someone pointed out that a live stream of a convention was killed by Youtube because the people in the crowd started singing "Happy Birthday." (https://www.techdirt.com/articles/20131014/15323524876/youtube-kills-livestream-convention-when-audience-starts-singing-happy-birthday.shtml) So, really, all they'd need to do to implement it on streams is to just hook every stream on the service into whatever they're using to detect copyrighted music, and then, if they detect the beginnings of such a song on that stream, kill the stream altogether.

The sheer fact that the goddamned Happy fucking Birthday song is apparently still in copyright is one of the very best examples of what is so utterly fucked up about copyright, in general. (Though that may not be the case for much longer (http://en.wikipedia.org/wiki/Happy_Birthday_to_You#Copyright_status), hopefully, at least for this one particular song.)