interesting point of view: norm based ip versus law-based ip

norms-based intellectual property systems: the case of french chefs | eric von hippel

in contrast, the recent rearm of the friends of a law based version who are eager to gain term extension for related rights in sound recording from 50 to 70 years | irights.info

additive: a lot of good and interesting ideas can be found on mr hippel's site: either in the length of a book or singular studies. worth to dig, relieved from property ... and while reading the name james boyle pops up again ;)