There’s a remarkable and worthwhile thread forming over at Shelley Powers’ Burningbird blog after her post on RSS and copyright. 
I don’t agree with everything written there, but it’s a fascinating
back-and-forth, and features two posts (at least) from Denise Howell,
which alone makes it worth the read.  It strikes me as just the
kind of sorting process that we need to go through, to get opinions
about these norms aired and understood.