An excellent article in the Wall Street Journal about art ownership, preservation, and the conflicts that can arise between the artist and the purchaser of art. I think these sorts of conflicts affect those whose art is more in the realm of "untraditional" - i.e. installation artists, sculptors who employ lots of found object, and so on. But even straight painters deal with this stuff from time to time. Having had at least one mural destroyed (I will never paint another mural again, by the way), I can sympathize with some of the concerns in this article. It can happen to anyone, including great and famous artists (such as Diego Rivera, for example).
American paintings in oil, egg tempera, and watercolor