Sadly, it's still not all that clear. And it seems to reinforce a sense that (generic) music publishing rights collecting societies will try to collect a pound of flesh wherever they can find one undefended.
Then again, we live in a really imperfect world, and the alternative might be worse. Keep telling yourself that and maybe your grandchildren will be the ones who finally have to take the action needed to make copyright law remotely address the realities of current technologies.
"We apologize for the confusion regarding recent claims labeled as "CS." We have now changed "CS" to "Music Publishing Rights Collecting Society" to better describe the nature of the claim. These are claims to musical compositions made on behalf of Collecting Societies which represent music publishers in certain territories."
- Content owner, who is CS??? - YouTube Help (view on Google Sidewiki)