[muzicman144]

In This day and age, anyone with a modern computer, laser printer to print on disc, and common sense can duplicate any karaoke manufacturers disk and you can't tell the difference.
Same can be said for a reciept showing one bought the disk. May take a while, but it can be done very easy with todays technology.
Catching a pirate is one thing, proving he is one is something else. So many small music stores that sold cdg's have gone out of business, no records remain, so it is pretty easy to provide a bogus, but non tracable receipt for any cdg bought.
JMHO
muzicman144