What you both are saying is true, currently you can buy single discs on Amazon or Ebay. This announcement was the first time I am aware of ZOOM stating they can not sell to customers in the USA. I suspect we will be seeing more US restrictions as well.
The downloads already advise they have PRS licencing and not covered in the USA and Canada. Maybe there will be more info available after the Karaoke Summit.
"Karaoke Cloud Music City Summit 2013 | June 20, 2013 Nashville Downtown Hilton
Topics to be covered include:
◾State Of The Cloud Address
◾Sync Licensing – Your song isn’t on karaoke
◾
Sync Rights In A Global Economy◾Consumer Demands in the Karaoke Trenches
◾Flaming Hoops – Clearing A Song For Karaoke
◾Piracy Interdiction Efforts in the US
◾
Structuring Licensing Contracts◾Software Tools for Accurate Reporting
◾Future Tech – Where The Cloud Is Going
http://karaokesummit.wordpress.com/