Are your briefs copyrighted?

Your legal briefs, that is. Earlier this week, two lawyers filed a class action lawsuit against Lexis and Westlaw, claiming that lawyers have a copyright interest in their legal filings, even those lawyers who have not obtained copyright registration (like me -- and probably you). A story on the case is here: http://www.newyorklawjournal.com/PubArticleNY.jsp?id=1202543304675