eNamrah on 10 June 2009
http://www.xbox.com/en-US/support/systemuse/xbox360/licensemigration/faq.htm
edit: my mistake. I thought licenses were tied solely to the gamertag, in that your son could transfer his licenses to his 360, but unfortunately it would transfer the stuff downloaded under your gamertag as well. Sucks that it's tied to the console and not the gamertag.
