Robert Hornung writes:

BTW, who says that parts of Wikipedia haven't been registered with national copyright registration agencies (like the Library of Congress)?

Show me some of those registrations, then. I'd be happy to admit I'm mistaken about this, if I am.

And I think I could come up with a market value of some of this content vs. its diminished value due to ignoring GFDL requirements. That it wouldn't be easy is true, but it is not wise to assume no value to this content.

No one is assuming the content is of no value. But I don't know of any caselaw anywhere in which wiki edits or additions, otherwise offered for free, have been valued in a court proceeding. Perhaps you can provide citations?

Best regards,

--Mike