Given the MPAA crack down and now the YouTube / Viacom lawsuit, it was probably just a matter of time.

Users that have downloaded pirated content from docstoc are finding that it may not have been worth it to download those BarBri outlines from 2003 as they are now being served with summons and possible fines based on their activities. One affected user I spoke to has also reported that he received word that his state bar had been notified as a violation of professional conduct. Ouch!
and continued..

I agree that they are most likely going after the uploader at this point. But case law does exist to support going after the downloader (or taker):

http://caselaw.lp.findlaw.com/scripts/getcase.pl?court=US&vol=473&invol=207


As far as figuring out who the person is, docstoc state in their terms:

"We will disclose your personally identifiable information if we reasonably believe we are required to do so by law, regulation or in cooperation with any governmental investigation."

That being said, you don't have to be a rocket scientist to figure out that this do***ent (look at do***ent properties):

http://www.docstoc.com/docs/15326/Individual-Rights-Lecture


..was last saved by someone named "Benno Ashrafi" which a google search:

http://www.google.com/search?q=Benno+Ashrafi+attorney


..turns up a guy at Waters and Kraus in LA