That can't be helped. This is one of the few negative and positive aspects of the internet. Since downloading is already there, it couldn't be stopped at the moment because one can't be arrested that easy by just uploading a song or a video.

The leakage of the song brings both negative and positive thing for Hikki, negative because when somebody download it, the leakage will go larger and larger, that is when the piracy attacks. The positive thing is that, leakage is also a hidden promotion for some. Once they hear the full song, there'll be a tendency that they would want an original version of it. So instead of downloading, they would want to have the physical copy or the iTunes copy of it. Besides, the first leakage originally started from Hikki. She uploaded her video on YouTube. And of course, youtube downloaders are everywhere, you know..