They have the right to tell people who are using the equipment they don't like on their premises to turn it off or leave. But they don't have the right to use illegal means to disrupt that equipment. It's sort of like you have the right to tell people walking across your property to leave or face trespass charges, but you don't have the right to viciously murder them for it... Ok, bad example, you might live in Texas. How about if you own a movie theater and you don't want people talking. You have the right to tell them to shut up or leave or face trespass charges. Walking up to them and spraying chloroform mist into their face to shut them up is beyond your rights.