http://blog.twitch.tv/2014/08/3136/
Basically they have a system that will scan your archived streams. If it senses any copyright material it will mute it, like Youtube. You can appeal if it was music in the game as ambiance if I recall, but other than that it's tough luck. I have dealt with this on Youtube and it's no dice on the uploader end of things.
Now, if you'll excuse me...
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