Dekortage writes "Have you ever ratted somebody out? If it was a legal case, you might end up on Who's A Rat, an online database of police informants and undercover agents, identified through various publicly-available documents such as court briefings. The data-mined information is now available online at a price. As reported in the New York Times, 'The site says it has identified 4,300 informers and 400 undercover agents, many of them from documents obtained from court files available on the Internet.' Understandably, U.S. judges and law enforcement agents are upset, although defense lawyers seem to like the idea. Where do you draw the line between legal transparency and secrecy?"