About custom skins/music/announcers

Hello guys, I don't know much about Riot's policy on this subject, and i'm a bit worried... I really liked the bigewater music and announcer, and recently found Wooxy, a program made to customize League. I then downloaded the bilgewater music/annnouncer and installed them. What worries me is that is technically altering the game and i'm pretty sure riot does not like this, and some friends told me it was risky to do so. On the other hand, these alterations come from Riot themselves, does it change anything ? Do i risk a sanction for this ?
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