Maybe they're thinking of that new WIPO broadcasting right (ptui! wash my mouth out), I mean, privilege
that protects a redistribution against 'theft'.
So, even if you grant a liberal license to your own work, a redistributor can still stop you copying from their redistribution of it.
That's only fair isn't it? How else is a poor publisher/broadcaster to make any money if they can't keep on being granted distribution monopolies (or rights as they like to call them)?
From the Onion: iTunes To Sell You Your Home Videos For $1.99 Each
Please note, this is a spoof, but it does point to the fact that copyright increasingly "belongs" to corporations and that the users of content are losing their rights to the usage of content.