Well, here's another development in the spate of copyrighting and patenting that's been going on recently. Riot apparently filed a patent for spectator modes back in 2012 and are currently attempting to patent matchmaking:
http://www.google.com/patents/US8636589
https://www.google.com/patents/WO2014014840A1
Edit: Riot's response to the discovery of the patents - http://www.riotgames.com/articles/20140206/1165/no-interest-using-patents-offensively
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