The way you experience YouTube may be dramatically different before the end of the year. According to multiple sources, the world's largest video-sharing site is preparing to launch its two separate subscription services before the end of 2015 — Music Key, which has been in beta since last November, and another unnamed service targeting YouTube's premium content creators, which will come with a paywall. Taken together, YouTube will be a mix of free, ad-supported content and premium videos that sit behind a paywall.

With the exception of a few video rentals, YouTube has always been a free, ad-supported service. But the company is about to get serious about subscription services, offering new ways for the users that create videos to make money.