Do magicians "own" their tricks?

Slate Magazine: "The research bears—albeit obliquely—on an issue that is only going to become more important: intellectual property in a world where more and more of the wealth that is created takes the form of ideas rather than objects. Intellectual property law does not protect magical tricks very well, and it does not help much in high fashion or in haute cuisine, either—all areas that Loshin describes as a 'negative space' for intellectual property."