When Soundreef claims the music rights shares related to Youtube videos on behalf of its rights holders, monetisation is always referred to as the established policy. However, it could happen that many parties legitimately claim a part of a video within the same territory (for instance, one of the parties could claim the visual component of the video). If this is the case, Youtube states that the most restrictive rule is the prevailing one, among those detected by all the parties.

Here you can find a detailed explanation of the above-mentioned case.