I believe they are avoiding from using the music from series to prevent any copyright issues. For example, look at Crusader Kings 2 mod for game of thrones. They had some issues on that regard and the only reason it's not removed yet is because it's not monetized. But the mod is on the watch now and is a bit limited in some regards. polygon com/2015/2/17/8052289/crusader-kings-game-of-thrones-mod-hbo
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Hi