The folks at Dubset.com, one of the original General Assembly companies, have released a fun little explainer video on the MixSCAN technology they are developing in partnership with Sony Gracenote. The idea is that DJs can upload their mixes and create a virtual watermark. That way any system running MixSCAN can identify when a particular mix is being played and provide an easy channel for the DJ to be paid.
Its not clear yet how Dubset hopes to get MixSCAN implemented in the mass market or under what circumstances users might begin paying for mix tapes they are used to getting for free. But a turnkey solution for rewarding the creators of mix tapes sounds like a noble effort, so hopefully some smart things are in the works.