[ddouglass]

If you check the disks you buy they have exactly the same license information. If you keep your receipts for downloaded songs from legal sites (Chartbuster, Stingray, etc) then you should be ok.
Sound Choice sold the rights to many of their older productions to Stingray who markets them through their Karaoke Channel. Should be ok to use them, but make sure you keep the receipts.

And as a reminder videos do not show in the preview window.