How Daft Can You Get?

Let me count the ways:

David Cameron has pledged to extend copyright on music to 70 years - in exchange for an effort by music bosses to curb violent music and imagery.

What on earth has one got to do with the other? How will "music bosses" "curb" this stuff? What happens if they "curb" only some of it? Or if only some of them curb it? Do they all get an extension to 63 and a bit years? Or do some get any extension to 70, but the others not? Talk about hare-brained....