Originally posted by Buzz

At this time the only way to claim an existing username is a valid trademark case, so LazyTown Entertainment did that because it used to belong to someone else (and the channel was even closed due a copyright issue).
http://www.google.com/support/youtube/b ... 44601&rd=1
Trademark
Using someone else's trademark in a username, in and of itself, is not necessarily infringing. However, if there is content on your user page that would confuse viewers into believing that the trademark owner created or sponsors your page or content, then the trademark owner's rights are likely being infringed and we will need to reclaim your username. So it's important to be sensitive to other people's trademark rights when choosing a username.
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