Is there a MIME header for copyright holder?

[shr...@cyberspace.org]

Is there?

And if so, why is it not in every HTTP header distributing copyrighted
material in the universe? Seriously, shouldn't I be able to just
disable copyrighted material in my web browser or email client? Or do
a regex match against a mime header to blacklist content from
companies whose behavior I find reprehensible?

My guess is that the same dirt-bags responsible for SOPA and the like,
would find their stock taking a hit, if people could boycott them by
flipping a switch in their web browsers. I can think of half a dozen
companies that I would blacklist in my browser, if their content was
copyright marked in a distinguishable way.

So WTF? Why is this not main-stream Internet technology?
Thanks!