Always read the small print of any T&Cs.
One member of this forum has already been told that effectively, dubbing of karaoke CD+G discs are NOT covered by the Produb licence - so it is probably a very good idea to read
here...and read
here with regard to karaoke and the Produb licence before scrambling for the wallet like this chap!

If you choose to contact the Produb Company / organisation direct for clarity, great. But ALWAYS GET THEIR STATEMENT / REPLY IN WRITING, as DJs in the past have reportedly been told more tales than a volume of the Grimm's fairy tales - and that IS pretty grim!
I've been told that dubbing own CDs to MP3 and using commercially in public, you'll need the licence, unless you legally purchase MP3s and utilise from the drive you downloaded directly to, and continue to use higher quality CDs - no licence (apparently) required.