While listening to a comment by Ray Robinson of KVOH that he wasn't necessary wedded to shortwave, a flash of inspiration appeared in my mind.
Although I haven't read about this idea elsewhere, I'm fairly sure that this possibility has been discussed previously by other people.
Can the Creative Commons license be extended to include distribution of content solely via shortwave? In other words, create a license for content that is only legally distributed via shortwave frequencies. Maybe, restricting distribution for open content via shortwave will help sustain shortwave's viability.
PS I haven't checked the Creative Commons licenses for quite awhile.