A new user registered a few days ago using the name "Harry Potter". Warner Bros and JK Rowling have a trademark registered for this name.
On the new users talk page ( http://www.wikipedia.org/wiki/User_talk%3AHarry_Potter ), MammaBaer posted some concerns about the user name and its legal status. I'm not experienced in trademark law, so I post this to the list.
Is the use of a trademarked name as a username problematic?
JeLuF
Somewhat, depending on the aggressiveness of the trademark holder. I think I heard that even The MacDonald, (the Lord of the Isles) had trouble with MacDonald's which is absolutely ridiculous. Probably it is a non-issue as it will fall below their radar. i named a city on a mud Redwall and have yet to hear from Brian Jacques....
Fred