Jeff Yates (SUNY Binghamton--Poli Sci) ignited an important discussion (here) about data sharing norms and possible variations across fields. Jeff notes:
"In political science there are very strong professional mores to share data with other researchers. In fact, it is usually expected immediately after publication of your first article using the data if not before that time (e.g. after presenting a working paper at a conference). I profess some ignorance of the social mores on data sharing in empirical legal studies, but from my few conversations on this point, I think that they might be somewhat different."
Setting aside scholarly norms (or, better yet, aspirations), Jeff also wonders whether IP doctrine tugs norms for empirical legal scholars.