It's not worth it. No form of copy protection will stop someone who really wants to copy it. All it will do is annoy people who want to legitimately rip the cd.
Honestly, you're asking on the wrong forum, because we know the truth -- it's been said a few times already. There will always be a way around copy protection.
Firstly, I can break copy protection on CDs simply by thinking about breaking it.
Secondly, if you aren't signed, or aren't big, you want to be throwing out as much of your music as you can. Your primary income is not from selling CDs, but from playing gigs. You want as many people as you can to listen to your music.Once you get signed, then your company will deal with copy protecting the CDs.