Will be posting an article of progress, as of right now xlive is completely gone, therefore (activation is gone).  there is a master server that handles pack transfer between clients.
This is obviously a vague description if you want greater details permanulled can explain it to you or just wait till I write up a project article and synapse.
Removing activation is completely legal now as of October 27, 2015 based off this 
article.
And 
this page shows Microsoft dropped support in 2012 for halo 2
 
			
		
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