Maybe the other non-DRM part is some kind of digital mode(MFSK, PSK....) akin to the VOA Radiogram?
Yes I decoded all Week Shortwave Radiogram, you can sea to this french Forum my login is PANDORE88 :
Mixer Platine MF9 Mhz with Dream
Mantova Turbo 5/8 wave for 27 mhz
Long Wire 80 meter