Whoa, I'm really shocked that the case essentially lost there several times. That's.... terrible. One of them because they "failed to register copyright in the US" according to the Wikipedia. I was under the impression that there was no real need to register under US copyright law as its an automatic right.
This also apply when the "worker" is a boss, but working for a client, he do it in a lazy manner hoping his client won't notice...
http://en.wikipedia.org/wiki/Timbaland_plagiarism_controvers...