I’m not sure of the deal with track licencing for cds and stuff but i know it’s complicated withn you paying a percentange of your earnings or a flat rate fee to licence a track for a given amount of time…
But having said that downloading tracks off the internet breaches copyright and small scale copying is impossible to detact or stop. 😉
To play music in public your suppose to have a PPL (public performance licence) which costs about £100 a year. All clubs, bars and professional djs have them (yes this really is a licence to mix!) The money from this goes to the musics producers so it keeps them from complains about licence and copyright issues.
Thats about all i know and i doubt it’s been any use to you at all 😀