I see what I said as corollary, rather than representing Kopimi.

What you say about (b) only follows from current social norms, which can change and I believe will change over time. I understand what you mean about attribution, but it is also difficult to give attribution to certain copyrighted works in today's climate without admitting "guilt".

As per (c), have you ever run Firebug against Facebook's site to see how they do things? If you haven't, you're missing out. :)