Things aren't as cut and dry with legal traditions. I'm sure there are tons of scraps of legal language that remain in use only because it's traditional and few people know any better. Like some kind of legal shibboleth.

Like coderdude said above[1], whenever you see "All Rights Reserved"[2] you're seeing it in action.

1. http://news.ycombinator.com/item?id=3541501 2. http://en.wikipedia.org/wiki/All_rights_reserved