Any monopoly over public information is questionable, but we cast an especially gimlet gaze on attempts to monopolize publicly-funded information. That's what the government of Canada is doing to GeoCoder.ca right now (well, "doing to all Canadians" would be more accurate, but GeoCoder.ca is the lucky proximate target).
Canada Post is upset over GeoCoder's freely-licensed database of Canadian postal codes. Since 2004 GeoCoder has crowdsourced the creation of a geo-coded Canadian postal code database. That is, members of the public have entered postal codes (public data) linked to location information (also public data). The resultant dataset is useable by anyone, and saves people from having to pay Canada Post $5000 CAD for an official copy.
So what does Canada Post do? Naturally, they sue.
(Plant face firmly in desk here.)
No, really. It's not April Fool's Day anymore -- we wouldn't make this up. Here's a quote from Canada Post's lawyer-gram: