I hope it is self-explanatory. It already exists in a number of forms in the UK. For instance, we have regulation of broadcast news, which requires a certain amount of an investment in and type of news content. In other countries, behavioural regulation is used to influence the way in which news providers present content and provide access to alternative view points.
The idea is that rather than focusing on the number of players or the size of news providers, the focus here is on what they do and regulating a sort of plurality, an internal plurality outcome.