This paper points out that there was a deep-seated tendency to give special weight to rights recognized by the State at the three year long discussion in the symposium: The Rise and Development of Legal Rights.
Then, we insist that the concept of rights in the sociology of law should include not only visible rights (recognized by the State) but also invisible rights (recognized in the everyday world).
Making researches on rights in the everyday world, we learn many things from Hart and Hayek. Especially the conceptions of "practice" and "convention" are highly important.
The paper concludes that the sociology of law should start out to clear the invisible system of the everyday world.