theres a few tools out there to keep your average joe from copying cds but theres no real copy protection, there has never been and never will be, besides if someone wants to copy your clients cd which is probably a business presentation hes promoting your client for free so it really makes no sense to me.
Anyways if you want some info on how to “Copy Protect” :sure: you can check out these programs at
Easy Audio Lock
WTM CD Protect
and for more info on cd protection and encryption you can always go here www.cdfeaks.com good luck