Open Radio

After open source radio management, here's a piece by Richard Poynder about open radio itself:

I realised that KRUU is more than just a community radio station: it is also a grassroots initiative with a deep commitment to the principles advocated by the various free and open movements. Or as station manager James Moore more extensively described it during the inaugural Open Views programme, KRUU is "grassroots, community, public, non-profit, open radio."

Moore's use of the term "open radio" caught my attention. What, I wondered, did he mean?