This is an abuse of the legal system. If you don't want pictures taken on your private property, don't allow cameras in.
I doubt their argument would hold up under any legal scrutiny.
I am with you. This is going over and over, the FIA, the FIFA, the NBA, the NFL, and now the IOC. Sometimes I am just so tired to hear about the abuse/misinterpretation of Copy Right laws that I do not want to talk about it. However I always ended saying how silly these companies are in trying to "protect" their "rights".